"I can already see a "nighttime" microseism problem, probably =
temperature changes......which could be
a problem later in the =
fall=20
and winter. (Around 2-3 AM till after the sun is up and =
warms up a=20
little, the trace gets stronger and=20
noisy. It clears up and smoothes out later in the =
day.)"
If a magnet's strength increases, even minutely, it would affect =
the=20
induced current in the coil proportionally. This could cause the slight =
increase=20
in trace's signal strength.
My magnet is laying on the concrete floor absorbing any temperature =
changes. I am going to try to laying my magnets on a piece of thin =
Styrofoam, insulating it from the floor, and see how it responds =
tonight.
In a message=20=
dated 04/07/06, gpayton880@....... writes:
Subj:Microseisms Discuss=
ion
From: gpayton880@....... (Jerry Payton)
To: chuckbou@............. (Boudreaux, Chuck), dwheelerf5@earthlin=
k.net (Don Wheller), tekmate@.............. (Joe Lincoln), jc3@................
(Cole, John), johnstilwell@............. (Stilwell, John), ChrisAtUpw@.......
m (Chapman Chris)
Hi Jerry,
I suggest that you go to http://psn=
..quake.net/ and download the letter archives back to 1996. Decompress them i=
nto annual word processor files. You can then search for topics with 'find'.=
Have a good long read!
Amateur seismology is likely to be=20=
much more of a technical challenge than the professional variety. The profes=
sionals choose very low noise remote seismic sites, buy highly developed and=
completely engineered seismometers at >>$5 K per channel and have the=
m professionally installed, often in boreholes to reduce surface noise.
The amateur variety is very much DIY, with many en=
thusiasts constructing and then setting up their own equipment. Amateur site=
s are likely to be mediocre to appalling compared to the professional ones,=20=
so you have to learn to live with the limitations and to compensate for them=
.. When making and using your own equipment, you learn that success is hard w=
on and takes considerable time, effort and patience. You also learn how to s=
et up the level, the period and the damping, how to check the performance, i=
dentify and correct problems.
The original Lehman was OK 'for a start' back in 1976=
, but the performance was limited by the poor point / knife edge lower suspe=
nsion amongst other factors. John Cole has pioneered the rolling contact typ=
e of suspension, which dramatically improves the performance and enables you=
to set up stable periods of well over 30 sec.=20
The considerable improvements in construction, suspen=
sions, damping and detectors that have appeared during the last 30 years do=20=
not yet seem to have been reflected in a 'good simple design' available to p=
otential constructors.=20
Now Jerry, I know that you were experiencing setup pr=
oblems. What period are you using and is the damping set ~critical? Do you h=
ave a .psn file of the output?
You can expect John's seismometer to be capable of a=20=
period of over 25 sec, even in a poor environment. You need to achieve this=20=
sort of period or greater to enable you to detect the long period Love waves=
.. If you aren't achieving this, you need to reduce the small angle between t=
he suspension axis and the vertical. It could be that the floor is not level=
, that you have not assembled it quite correctly, or that something has got=20=
bent / damaged in transit. If you are NOT getting a long period, THE ANGLE I=
S WRONG. The screw extension on the top wire has very little effect on the p=
eriod - it just enables you to get the mass at a suitable height above the f=
loor.
Hello Out There: PSN=20=
& ATN
=20
I'm throwing this out for discussion and / or experimentation to the=20=
group(s) as a whole. Anyone investigated this problem? If it is=20=
temperature fluctuations, what is it affecting, the coil, the pendulum, or w=
hat? The fact that the trace get amplified somewhat (in my case) indic=
ates to me that it may be affecting the electrical part: coil or magnets the=
mselves?
You have not really descr=
ibed your problems well enough for us to advise you.=20
There is background environmental n=
oise which changes with time, the weather and a wide range of human activiti=
es. Microseismic ocean background is usually at about 6 sec and near sine wa=
ve, which again changes phase and amplitude with time. This exists at all ti=
mes. Wind noise can give a range of short to very long period signals. The s=
eismometer is very sensitive to changes in the tilt angle, from a variety of=
sources - the walk up test. It is very sensitive to drafts and may also be=20=
noisy when the external temperature falls below the instrument temperature,=20=
due to convection. You need an insulating cover with all the joins 100% seal=
ed. If the joins are not airtight, it will likely be noisy.
You may also experience electronic=20=
problems due to pickup from transients on the house power wiring. Fridges of=
ten give problems. Some areas have noisy supplies. Electric trains can cause=
problems. Do you have the input line to the amplifier screened and the scre=
en and 0V line earthed? Some of the older / foreign computers had very inade=
quately filtered power supplies. Do you have a local radio transmitter, a TV=
station or a phone transmitter aerial close by? One test is to wedge=20=
the mass in position and take a trace.=20
I suggest that you set the recordin=
g for a 24 hr drumplot display. This should sort out any time variations.
What's the affect of cooling on a magnet's flux strength -- or on the in=
duced
voltage in a coil?
Insignificant with your i=
nstrument.
Obviously, supplying=20=
a heat source might help. There must be a "cure", not a patch.
=20
(snip)
"I can already see a "nighttime" microseism problem, probably temp=
erature changes......which could be=20
a problem later in the fall and winter. (Around 2-3 AM till after=20=
the sun is up and warms up a little, the trace gets stronger an=
d noisy. It clears up and smoothes out later in the day.)"
(snip)
"I experience this during the winter. My sensor in inside my home=
so I have no problems during the summer. However, I typically turn the heat=
ing unit down at night. This is when I get the problems. I placed a light bu=
lb in the closet that helps quite a bit. I usually only turn it on during th=
e winter. Several of us have experienced this problem. Maybe it's something=20=
we can work on and figure out a solution."
A known and well documented problem=
, for those who are not too lazy to read up the psn archives.
Only you DON'T use a light bulb. Th=
is just attracts flying insects, spiders and creepy crawlies. You have enoug=
h problems without inviting 'bug quakes'. Bulbs also move the air due to con=
vection.=20
With so many advisors, I wonder if=20=
some of the advice may be conflicting? You have not said what you have been=20=
advised and what steps you have taken.=20
Regards,
Chris Chapman
Subject: Re: Microseisms Discussion
From: "Jerry Payton" gpayton880@.......
Date: Tue, 4 Jul 2006 21:32:39 -0500
Chris,
I appreciate your input, your education, your knowledge and experience. I
really do. That is why I included you in my email to everyone.
Since you asked, I have achieved a 14-16 sec. period and from what others
tell me and what I read on PSN stations list, it is not that bad to start
with and learn.. That is what I am trying to discover.....is it good
enough!
My overnight "wiggles" seem to me to be possibility related to temperature
variations because it goes away later in the morning after daytime warming
up. I do not have enough community related noise close enough to cause
problems. I have placed a piece of foam under the magnets and see what
happens tonight. I know you told me that was not the problem! But, I have
to check it out. Also, I have no idea what material the magnets are made
from since John bought them (source unknown)
Chris, I realize that the amateur seismology community does NOT have the
mega-bucks for equipment and must suffer the limitations, but that it NO
reason not to strive for better performance, troubleshoot problems and
strive to improve equipment, within our budgets! Don't tell me that it
can't be done. I won't accept that.
Don't tell me that my damned floor is not level either. What floor is,
totally. That is what the leveling screws are for and I did that. I
understand about the angle adjustment too, but simply saying that it needs
to changed does not make it easy to accomplish.
The sensor worked for John before he sent it to me. I will make it work for
me too, and improve its performance if I can. I do not want to redesign or
rebuild it. After all, it is mostly all his sensors that you see posted on
the PSN website. Where are all those other BETTER posts? The proof is in
the pudding. Isn't that what they say?
I don't mean to be disrespectful, but I am not a scientist or engineer. I'm
doing the best I can with the knowledge and money I have......which ain't
much :>)
Regards,
Jerry
.
Chris,
I appreciate your input, your education, your knowledge and=20
experience. I really do. That is why I included you in my =
email to=20
everyone.
Since you asked, I have achieved a 14-16 sec. period and from what =
others=20
tell me and what I read on PSN stations list, it is not that bad to =
start=20
with and learn.. That is what I am trying to discover.....is it =
good=20
enough!
My overnight "wiggles" seem to me to be possibility =
related to=20
temperature variations because it goes away later in the morning after =
daytime=20
warming up. I do not have enough community related noise close =
enough to=20
cause problems. I have placed a piece of foam under the magnets =
and see=20
what happens tonight. I know you told me that was not the=20
problem! But, I have to check it out. Also, I have no =
idea what=20
material the magnets are made from since John bought them (source=20
unknown)
Chris, I realize that the amateur seismology community does =
NOT have=20
the mega-bucks for equipment and must suffer the limitations, but that =
it NO=20
reason not to strive for better performance, troubleshoot =
problems and=20
strive to improve equipment, within our budgets! Don't tell =
me that=20
it can't be done. I won't accept that.
Don't tell me that my damned floor is not level either. What =
floor=20
is, totally. That is what the leveling screws are for and I did=20
that. I understand about the angle adjustment too, but simply =
saying that=20
it needs to changed does not make it easy to accomplish.
The sensor worked for John before he sent it to me. I will =
make it=20
work for me too, and improve its performance if I can. I do not =
want to=20
redesign or rebuild it. After all, it is mostly all his sensors =
that you=20
see posted on the PSN website. Where are all those other =
BETTER=20
posts? The proof is in the pudding. Isn't that what they =
say?
I don't mean to be disrespectful, but I am not a scientist or=20
engineer. I'm doing the best I can with the knowledge and money I=20
have......which ain't much :>)
Regards,
Jerry
.
Subject: Check you VHS video tapes...for crossed rod pivot parts
From: "meredith lamb" paleoartifact@.........
Date: Wed, 5 Jul 2006 13:03:15 -0600
Hi all,
Heyyyyy...this part seemingly has real potential ! If you even vaguely have
followed last
years emails on crossed rod pivot/hinges; this might be something you can
also try
during any bored or curious moments.
Its within common VHS video tape cassettes. Most all cassettes use two tape
spacer/
guides, that appear to be ultra smooth stainless steel. The minority can be
plastic.
Most of them appear to be punched/stamped out of sheet metal and then formed
into a round tube; and then they appear to have been further smoothed to
where they
don't damage the video tape moving over their surfaces. The rarest
spacer/guide is a
complete cut off tube. You can open the release latch on the side of the
cassette to
view parts of these tubes behind the tape. You can generally easily open to
remove
them by first removing 5 small phillips head screws on the bottom of the
cassette
itself. The rare cassette might be plastic welded shut.
The main point here being the very smooth surface of these metal tubes is
what one
absolutely needs for a crossed rod pivot. Naturally, the contact points
won't be over
the lengthwise joint. Being as they are essentially tubes, one can use
bolts and
nuts to seat/mount them, which is also very convenient. If you only use
these, you
only need 4 (2 cassettes) tubes; 2 for running in one spaced apart
direction, and 2
"cross rod" (right angle to the other two) to attach to either side of the
boom you
use. They appear to all be ~ .630" length (16.0mm), .225" outside diameter
(5.75mm),
..190" inside diameter (4.90mm), with a wall thickness of .0175" (.5mm).
The second main point here, is that from testing a variety of solid rod kind
of
material late last year; their low friction level is absolutely amazing.
This means
greater seismic sensitivity especially for the low level mass enertia
offsets we
either can or can't sensor pickup with a majority of "home brew"
seismometers.
Credit Chris Chapman for bringing up the "crossed rod pivot" subject late
last year!
I intend to try such first as another "test table top edge" setup
eventually; where
there is only the pivot arrangement, and a test boom and mass. This would
be a
gravity vertical hanging mass pendulum. Its not really a S-G per-say; as
S-G's use
flexible strips of metal (torque limiting) as the
pivots...which...essentially....make
them kind of partial accelerometers. This would be a horizontal directional
sensing
unit. Will get back with you all later....with the specific test model
results; whether
its good, bad, or somewhere inbetween, as compared to solid rods tests of
the past.
Meredith Lamb
Hi all,
Heyyyyy...this part seemingly has real potential ! If you even vaguely have followed last
years emails on crossed rod pivot/hinges; this might be something you can also try
during any bored or curious moments.
Its within common VHS video tape cassettes. Most all cassettes use two tape spacer/
guides, that appear to be ultra smooth stainless steel. The minority can be plastic.
Most of them appear to be punched/stamped out of sheet metal and then formed
into a round tube; and then they appear to have been further smoothed to where they
don't damage the video tape moving over their surfaces. The rarest spacer/guide is a
complete cut off tube. You can open the release latch on the side of the cassette to
view parts of these tubes behind the tape. You can generally easily open to remove
them by first removing 5 small phillips head screws on the bottom of the cassette
itself. The rare cassette might be plastic welded shut.
The main point here being the very smooth surface of these metal tubes is what one
absolutely needs for a crossed rod pivot. Naturally, the contact points won't be over
the lengthwise joint. Being as they are essentially tubes, one can use bolts and
nuts to seat/mount them, which is also very convenient. If you only use these, you
only need 4 (2 cassettes) tubes; 2 for running in one spaced apart direction, and 2
"cross rod" (right angle to the other two) to attach to either side of the boom you
use. They appear to all be ~ .630" length (16.0mm), .225" outside diameter (5.75mm),
.190" inside diameter (4.90mm), with a wall thickness of .0175" (.5mm).
The second main point here, is that from testing a variety of solid rod kind of
material late last year; their low friction level is absolutely amazing. This means
greater seismic sensitivity especially for the low level mass enertia offsets we
either can or can't sensor pickup with a majority of "home brew" seismometers.
Credit Chris Chapman for bringing up the "crossed rod pivot" subject late last year!
I intend to try such first as another "test table top edge" setup eventually; where
there is only the pivot arrangement, and a test boom and mass. This would be a
gravity vertical hanging mass pendulum. Its not really a S-G per-say; as S-G's use
flexible strips of metal (torque limiting) as the pivots...which...essentially....make
them kind of partial accelerometers. This would be a horizontal directional sensing
unit. Will get back with you all later....with the specific test model results; whether
its good, bad, or somewhere inbetween, as compared to solid rods tests of the past.
Meredith Lamb
Subject: Re: Microseisms Discussion
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Thu, 06 Jul 2006 15:23:16 +0000
Hi Jerry
Can you give me a sample trace of the noise that you are getting ? Gif
image of a psn file.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Microseisms Discussion
From: "Jerry Payton" gpayton880@.......
Date: Thu, 6 Jul 2006 10:33:03 -0500
Thank you Jon, but I am told that this is normal. (My helicorder.gif is
displayed on http://teleseismic.net/helicorders/ at the bottom of the page
from Springdale, AR)
I adjusted my amplifier gain pot last night and may still do some
adjustments in days to come. Therefore, my GIF may look abnormal from time
to time.
I also live away from normal traffic, but among a LOT of trees, which I am
told may cause a high noise level. In short, I am told that it is normal
and is not for me to worry about.
Thank you for answering my plea.
Regards,
Jerry
----- Original Message -----
From: Jón Frímann
To: psn-l@..............
Sent: Thursday, July 06, 2006 10:23 AM
Subject: Re: Microseisms Discussion
Hi Jerry
Can you give me a sample trace of the noise that you are getting ? Gif
image of a psn file.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
Thank you Jon, but I am told that this is normal. (My =
helicorder.gif=20
is displayed on
http://teleseismic.net/helic=
orders/ at=20
the bottom of the page from Springdale, AR)
I adjusted my amplifier gain pot last night and may still do some=20
adjustments in days to come. Therefore, my GIF may look =
abnormal from=20
time to time.
I also live away from normal traffic, but among a LOT of trees, =
which I am=20
told may cause a high noise level. In short, I am told that it is =
normal=20
and is not for me to worry about.
Thank you for answering my plea.
Regards,
Jerry
----- Original Message -----
From:=20
J=F3n =
Fr=EDmann=20
Sent: Thursday, July 06, 2006 =
10:23=20
AM
Subject: Re: Microseisms =
Discussion
Hi Jerry
Can you give me a sample trace of the =
noise=20
that you are getting ? Gif
image of a psn =
file.
Regards.
--=20
J=F3n Fr=EDmann
http://www.jonfr.com
http://www.simnet.is/j=
onfr500/earthquake/
__________________________________________=
________________
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list email =
PSN-L-REQUEST@...............
=20
with
the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.co=
m/maillist.html=20
for more information.
Subject: Re: Microseisms Discussion
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Thu, 06 Jul 2006 16:53:52 +0000
Hi Jerry
Are you using a low pass filter on the graph that you have online ?
Becose there normally isn't alot of noise below 5Hz.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Microseisms Discussion
From: "Jerry Payton" gpayton880@.......
Date: Thu, 6 Jul 2006 12:19:04 -0500
Yes, Lo setting is 0.10 with 2 poles and Hi setting is 0.05 with 2 poles.
Be advise that I am interested in teleseismic events, primarily.
Jerry
----- Original Message -----
From: Jón Frímann
To: psn-l@..............
Sent: Thursday, July 06, 2006 11:53 AM
Subject: Re: Microseisms Discussion
Hi Jerry
Are you using a low pass filter on the graph that you have online ?
Becose there normally isn't alot of noise below 5Hz.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
Yes, Lo setting is 0.10 with 2 poles and Hi setting is 0.05 =
with 2=20
poles. Be advise that I am interested in teleseismic events,=20
primarily.
Jerry
----- Original Message -----
From:=20
J=F3n =
Fr=EDmann=20
Sent: Thursday, July 06, 2006 =
11:53=20
AM
Subject: Re: Microseisms =
Discussion
Hi Jerry
Are you using a low pass filter on the =
graph=20
that you have online ?
Becose there normally isn't alot of noise =
below=20
5Hz.
Regards.
--
J=F3n Fr=EDmann
http://www.jonfr.com
http://www.simnet.is/j=
onfr500/earthquake/
__________________________________________=
________________
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list email =
PSN-L-REQUEST@...............
=20
with
the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.co=
m/maillist.html=20
for more information.
Subject: Tajikistan earthquake swarm
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Fri, 07 Jul 2006 00:47:48 +0000
Hi all
There has been a intresting earthquake swarm in Tajikistan since 03:57
last night. It got started off by a mag 5.7 earthquakes, there has been
alot of aftershock activite. The largest aftershock has been a mag 4.7.
I find the location intresting, since there isn't any subduction zone
there or other type of fault zone. Aftershock activite is still ongoing
according to emsc-csem.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Tajikistan earthquake swarm
From: Dave Nelson davenn@...............
Date: Fri, 07 Jul 2006 20:17:07 +1000
Hi Jon
this is a MAJOR fault zone being on the western side of=20
the India -Asia Collision Zone. this whole region from Tajikistan right to=
=20
the east across the Tibetan Plateau is undergoing severe compression as=20
India rams its way into the Asian Continent. As a result many thrust and=20
strikeslip form as the material is squeezed
out to the eastern and western sides of the zone.
in this region you will find that most of the river valleys are actually=
=20
faultlines
that have been eroded out by riverflow as the crushed rock in the fault=20
line is softer than the surrounding material.
You can do a basic model this effect for yourself using a block of=20
semi-rigid material
like childrens play-dough as Asia and push a smaller width block of wood=20
into one side
and watch the play-dough squeeze out the sides
look here for pic of basic idea
http://www.sydneystormcity.com/india-asia_collision.bmp
cheers
Dave N
At 12:47 AM 7/07/2006 +0000, you wrote:
>Hi all
>There has been a intresting earthquake swarm in Tajikistan since 03:57
>last night. It got started off by a mag 5.7 earthquakes, there has been
>alot of aftershock activite. The largest aftershock has been a mag 4.7.
>I find the location intresting, since there isn't any subduction zone
>there or other type of fault zone. Aftershock activite is still ongoing
>according to emsc-csem.
>Regards.
>J=F3n Fr=EDmann
>http://www.jonfr.com
>http://www.simnet.is/jonfr500/earthquake/
>
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Anti-Virus.
>Version: 7.1.394 / Virus Database: 268.9.9/382 - Release Date: 4/07/2006
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.1.394 / Virus Database: 268.9.9/382 - Release Date: 4/07/2006
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Tajikistan earthquake swarm
From: John or Jan Lahr JohnJan@........
Date: Fri, 07 Jul 2006 08:54:01 -0700
Hi Jon,
For an excellent overview of global tectonics, there is a new version
of the This Dynamic Planet poster available here:
http://www.minerals.si.edu/tdpmap/. The PDF version is huge, but
once downloaded would be very helpful via the zoom-in tool of Adobe reader.
During the past few years the USGS has produced a summary posters
following the most significant earthquakes. They are very helpful in
providing insight into the tectonics of each region. For example, this poster:
ftp://hazards.cr.usgs.gov/maps/sigeqs/20020325/20020325.pdf was made
following a 2002 magnitude 7.4 event in the Hindu Kush. Again, the
pdf format is large, but includes all of the details when the zoom-in
tool of Adobe reader is used.
Links to all of the posters are included here:
http://earthquake.usgs.gov/eqcenter/eqarchives/poster/
Cheers,
John
At 03:17 AM 7/7/2006, you wrote:
> Hi Jon
> this is a MAJOR fault zone being on the western
> side of the India -Asia Collision Zone. this whole region from
> Tajikistan right to the east across the Tibetan Plateau is
> undergoing severe compression as India rams its way into the Asian
> Continent. As a result many thrust and strikeslip form as the
> material is squeezed out to the eastern and western sides of the zone....
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Tajikistan earthquake swarm
From: "Jerry Payton" gpayton880@.......
Date: Fri, 7 Jul 2006 11:36:02 -0500
Jon,
I agree with John. I just bought the full poster from USGS and it is a
"dandy."
Jerry Payton
----- Original Message -----
From: John or Jan Lahr
To: psn-l@..............
Sent: Friday, July 07, 2006 10:54 AM
Subject: Re: Tajikistan earthquake swarm
Hi Jon,
For an excellent overview of global tectonics, there is a new version
of the This Dynamic Planet poster available here:
http://www.minerals.si.edu/tdpmap/. The PDF version is huge, but
once downloaded would be very helpful via the zoom-in tool of Adobe
reader.
During the past few years the USGS has produced a summary posters
following the most significant earthquakes. They are very helpful in
providing insight into the tectonics of each region. For example, this
poster:
ftp://hazards.cr.usgs.gov/maps/sigeqs/20020325/20020325.pdf was made
following a 2002 magnitude 7.4 event in the Hindu Kush. Again, the
pdf format is large, but includes all of the details when the zoom-in
tool of Adobe reader is used.
Links to all of the posters are included here:
http://earthquake.usgs.gov/eqcenter/eqarchives/poster/
Cheers,
John
At 03:17 AM 7/7/2006, you wrote:
> Hi Jon
> this is a MAJOR fault zone being on the western
> side of the India -Asia Collision Zone. this whole region from
> Tajikistan right to the east across the Tibetan Plateau is
> undergoing severe compression as India rams its way into the Asian
> Continent. As a result many thrust and strikeslip form as the
> material is squeezed out to the eastern and western sides of the
zone....
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
Jon,
I agree with John. I just bought the full poster from =
USGS and=20
it is a "dandy."
Jerry Payton
----- Original Message -----
From:=20
John or =
Jan Lahr=20
Sent: Friday, July 07, 2006 =
10:54=20
AM
Subject: Re: Tajikistan =
earthquake=20
swarm
Hi Jon,
For an excellent overview of global =
tectonics,=20
there is a new version
of the This Dynamic Planet poster available =
here:
http://www.minerals.si.edu/td=
pmap/. =20
The PDF version is huge, but
once downloaded would be very helpful =
via the=20
zoom-in tool of Adobe reader.
During the past few years the =
USGS has=20
produced a summary posters
following the most significant=20
earthquakes. They are very helpful in
providing insight into =
the=20
tectonics of each region. For example, this poster:
ftp:=
//hazards.cr.usgs.gov/maps/sigeqs/20020325/20020325.pdf =20
was made
following a 2002 magnitude 7.4 event in the Hindu =
Kush. =20
Again, the
pdf format is large, but includes all of the details =
when the=20
zoom-in
tool of Adobe reader is used.
Links to all of the =
posters=20
are included here:
http://ea=
rthquake.usgs.gov/eqcenter/eqarchives/poster/
Cheers,
John<=
BR>
At=20
03:17 AM 7/7/2006, you wrote:
> Hi=20
=
Jon
> &n=
bsp; =20
this is a MAJOR fault zone being on the western
> =
side of=20
the India -Asia Collision Zone. this whole region from
>=20
Tajikistan right to the east across the Tibetan Plateau is
> =
undergoing=20
severe compression as India rams its way into the Asian
>=20
Continent. As a result many thrust and strikeslip form as the =
>=20
material is squeezed out to the eastern and western sides of the=20
=
zone....
_____________________________________________________=
_____
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list email =
PSN-L-REQUEST@...............
=20
with
the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.co=
m/maillist.html=20
for more information.
Subject: Re: Microseisms Discussion
From: ChrisAtUpw@.......
Date: Fri, 7 Jul 2006 13:14:57 EDT
In a message dated 06/07/06, gpayton880@....... writes:
> Are you using a low pass filter on the graph that you have online ?
> Because there normally isn't a lot of noise below 5Hz.
> Yes, Lo setting is 0.10 with 2 poles and Hi setting is 0.05 with 2 poles.
> Be advise that I am interested in teleseismic events, primarily.
Hi Jerry,
If you view the trace with these filter selections, YOU WILL MISS the
P & S waves which give you the earthquake timing. For these you need
frequencies from 2 Hz to 0.5 Hz. The much larger long period Love waves are fine for
picking up a quake.
> . (My helicorder.gif is displayed on http://teleseismic.net/helicorders/
> at the bottom of the page from Springdale, AR)
The commoner non seismic signals are air convection noise, traffic and
similar noise, sun / wind / draft / weather related noise and powerline
interference. However, you may get combinations of these signals.
FC1 from Friendswood Texas seems to be showing a lot of single pole /
asymmetric signals. I wonder if this could be powerline problems?
JL1 Hor at Spring Texas shows what appears to be chamber convection
noise, starting at about 19.00 local and stopping about 5 - 6.00 after dawn.
JS2 from Houston Texas shows strong signals starting at about 7.00 and
reducing after 13.00. Could this be air convection noise in a room which is
heated by the morning sun?
JS1 from Houston shows noise from about 7.00 and going on till late
evening. Could this be traffic related?
> I also live away from normal traffic, but among a LOT of trees, which I am
> told may cause a high noise level. In short, I am told that it is normal and
> is not for me to worry about.
JP1 from Springdale shows noise from about midnight till 10.00. Could
this be related to wind? Midnight seems late for the start of chamber air
convection noise, but by no means impossible. Is this behavoir repeatable?
Have you though of getting a small weather station? It could keep
track of the temperature changes and the wind speed and direction, which are
likely to effect you with many trees nearby. The basic Davis starts at about $200.
If you have a spare channel on your ADC, you might buy a couple of
photo diodes, connect them in parallel, but ~at right angles and record the
daylight / sun intensity? (45 deg to the vertical on an E/W axis.) This could give
you a fairly accurate indication of the solar heating.
I cut a hole in a ping-pong ball, stuck in a silicon photodiode with
silicone rubber cement and mounted it vertically, where sunlight could reach it
all day. The plastic ball acts as an 'integrating sphere' to give a near
average light value, but it weathers slowly and needs to replaced once a year. It
indicates dusk / dawn, whether it is cloudy or bright, etc.
You can also get a fairly good indication of sunpower by using two
thermometers, one screened and that other painted black and placed in the sun.
Regards,
Chris Chapman
In a me=
ssage dated 06/07/06, gpayton880@....... writes:
Are you using a low pass filter=
on the graph that you have online ?
Because there normally isn't a lot of noise below 5Hz.
Yes, Lo setting is 0.10 with 2=20=
poles and Hi setting is 0.05 with 2 poles. Be advise that I am i=
nterested in teleseismic events, primarily.
Hi Jerry,
If you view the trace with these filter=
selections, YOU WILL MISS the P & S waves which give you the earthquake=
timing. For these you need frequencies from 2 Hz to 0.5 Hz. The much larger=
long period Love waves are fine for picking up a quake.
. (My helicorder.gif is d=
isplayed on http://teleseism=
ic.net/helicorders/ at the bottom of the page from Springdale, AR) =
The commoner non seismic signals are ai=
r convection noise, traffic and similar noise, sun / wind / draft / weather=20=
related noise and powerline interference. However, you may get combinations=20=
of these signals.
FC1 from Friendswood Texas seems to be=20=
showing a lot of single pole / asymmetric signals. I wonder if this could be=
powerline problems?
JL1 Hor at Spring Texas shows what appe=
ars to be chamber convection noise, starting at about 19.00 local and stoppi=
ng about 5 - 6.00 after dawn.
JS2 from Houston Texas shows strong sig=
nals starting at about 7.00 and reducing after 13.00. Could this be air conv=
ection noise in a room which is heated by the morning sun?
JS1 from Houston shows noise from about=
7.00 and going on till late evening. Could this be traffic related?
I also live away from normal tr=
affic, but among a LOT of trees, which I am told may cause a high noise leve=
l. In short, I am told that it is normal and is not for me to worry ab=
out.
JP1 from Springdale shows noise from ab=
out midnight till 10.00. Could this be related to wind? Midnight seems late=20=
for the start of chamber air convection noise, but by no means impossible. I=
s this behavoir repeatable?
Have you though of getting a small weat=
her station? It could keep track of the temperature changes and the wind spe=
ed and direction, which are likely to effect you with many trees nearby. The=
basic Davis starts at about $200.
If you have a spare channel on your ADC=
, you might buy a couple of photo diodes, connect them in parallel, but ~at=20=
right angles and record the daylight / sun intensity? (45 deg to the vertica=
l on an E/W axis.) This could give you a fairly accurate indication of the s=
olar heating.
I cut a hole in a ping-pong ball, stuck=
in a silicon photodiode with silicone rubber cement and mounted it vertical=
ly, where sunlight could reach it all day. The plastic ball acts as an 'inte=
grating sphere' to give a near average light value, but it weathers slowly a=
nd needs to replaced once a year. It indicates dusk / dawn, whether it is cl=
oudy or bright, etc.
You can also get a fairly good in=
dication of sunpower by using two thermometers, one screened and that other=20=
painted black and placed in the sun.
Regards,
Chris Chapman
Subject: Help with telemetry equipment
From: "Wayne Abraham" gold1146@...........
Date: Sat, 08 Jul 2006 04:27:28 +0000
Hello all
I am in the process of designing a three-station seismic network for
monitoring two volcanoes within 8 kilometers of my home. I already have a
geophone buried at my house and am monitoring a nearby telemetered site. I
would like to install two remote stations using geophones, low-power
transmitters and Larry's amplifier board.
My main problem is converting the amplified seismic signal to a tone for
transmition (the received signal will be decoded using Larry's decoder
board). Does anyone on this list have schematics, internet links or know of
anyone selling this encoding equipment?
Thanks for your help
Wayne
http://dominicapsn.freeyellow.com
_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE!
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__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Sat, 8 Jul 2006 09:56:05 EDT
In a message dated 08/07/06, gold1146@........... writes:
> Does anyone on this list have schematics, internet links or know of
> anyone selling this encoding equipment?
Hi There,
As far as I know all encoders use the XR2206 function generator chip.
Regards,
Chris Chapman
In a me=
ssage dated 08/07/06, gold1146@........... writes:
Does anyone on this list have s=
chematics, internet links or know of
anyone selling this encoding equipment?
Hi There,
As far as I know all encoders use the X=
R2206 function generator chip.
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: Larry Cochrane lcochrane@..............
Date: Sun, 09 Jul 2006 14:27:33 -0700
Hi Wayne,
You will also need to buy or build a demodulator board other then mine. I no longer
sell my USGS Telemetry demodulator board since I never sold enough of them to go into
production. I wish I could help you out, but right now I have two big projects going
on and my plate is pretty full for the next few months.
Regards,
Larry Cochrane
Redwood City, PSN
Wayne Abraham wrote:
> Hello all
>
> I am in the process of designing a three-station seismic network for
> monitoring two volcanoes within 8 kilometers of my home. I already have a
> geophone buried at my house and am monitoring a nearby telemetered site. I
> would like to install two remote stations using geophones, low-power
> transmitters and Larry's amplifier board.
>
> My main problem is converting the amplified seismic signal to a tone for
> transmition (the received signal will be decoded using Larry's decoder
> board). Does anyone on this list have schematics, internet links or know of
> anyone selling this encoding equipment?
>
> Thanks for your help
> Wayne
> http://dominicapsn.freeyellow.com
>
> _________________________________________________________________
> Express yourself instantly with MSN Messenger! Download today it's FREE!
> http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
>
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Help with a Lehman
From: Mike Speed mike8s2@.........
Date: Sun, 9 Jul 2006 20:06:55 -0700 (PDT)
Hi all,
I've been thinking of building a Lehman and was wondering what practical considerations I might run in to if I significantly lengthen the boom.
Also, I've read at least one account in which a Lehman device produced a "spurious" signal due to vibration of the supporting wire. What is your view on this, i.e., is it a significant enough noise source to devise a means of damping this out?
Greg
---------------------------------
How low will we go? Check out Yahoo! Messenger’s low PC-to-Phone call rates.
Hi all,
I've been thinking of building a Lehman and was wondering what practical considerations I might run in to if I significantly lengthen the boom.
Also, I've read at least one account in which a Lehman device produced a "spurious" signal due to vibration of the supporting wire. What is your view on this, i.e., is it a significant enough noise source to devise a means of damping this out?
Greg
How low will we go? Check out Yahoo! Messenger’s low PC-to-Phone call rates.
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Sun, 9 Jul 2006 23:38:14 EDT
In a message dated 09/07/06, lcochrane@.............. writes:
> You will also need to buy or build a demodulator board other then mine. I
> no longer
> sell my USGS Telemetry demodulator board since I never sold enough of them
> to go into production.
Hi Larry,
In that case could you put the circuit diagram on your website,
please?
This would be most helpful.
Regards,
Chris Chapman
In a me=
ssage dated 09/07/06, lcochrane@.............. writes:
You will also need to buy or bu=
ild a demodulator board other then mine. I no longer
sell my USGS Telemetry demodulator board since I never sold enough of them t=
o go into production.
Hi Larry,
In that case could you put the circuit=20=
diagram on your website, please?
This would be most helpful.
Regards,
Chris Chapman
Subject: Re: Help with a Lehman
From: ChrisAtUpw@.......
Date: Mon, 10 Jul 2006 00:07:34 EDT
In a message dated 10/07/06, mike8s2@......... writes:
> I've been thinking of building a Lehman and was wondering what practical
> considerations I might run in to if I significantly lengthen the boom.
Hi Mike,
Lengthen the boom to what? 2ft is about enough unless you want periods
over 40 sec. The main considerations are the damping, which is far easier if
you use magnet + plate damping and the bottom bearing. The old points and
knife blades are not satisfactory and are likely to seriously limit your response.
The rolling ball and the crossed cylinders are fine. See
http://pages.prodigy.net/fxc/ and links
> Also, I've read at least one account in which a Lehman device produced a
> "spurious" signal due to vibration of the supporting wire.
This should not be a problem unless you use a really thick heavy wire.
Thin music wire or SS fishing trace are fine, preferably in a V to prevent
the boom rotating / oscillating axially. The other main consideration is to have
a light but rigid boom. I use 1/2" nom SS water pipe with compression
fittings, but Al and fairly thin wall brass are readily available.
Put your pickup coil on the end of the boom and use a non magnetic
mass, brass or lead are fine. If you put a magnet on the boom you will see a
great number of spurious responses, mostly from transients in the utility supply
house wiring, fridges, changes in the Earth's field, movements of cars and
bikes....
Regards,
Chris Chapman
In a me=
ssage dated 10/07/06, mike8s2@......... writes:
I've been thinking of building=20=
a Lehman and was wondering what practical considerations I might run in to i=
f I significantly lengthen the boom.
Hi Mike,
Lengthen the boom to what? 2ft is about=
enough unless you want periods over 40 sec. The main considerations are the=
damping, which is far easier if you use magnet + plate damping and the bott=
om bearing. The old points and knife blades are not satisfactory and are lik=
ely to seriously limit your response. The rolling ball and the crossed cylin=
ders are fine. See http://pages.prodigy.net/fxc/ and links
Also, I've read at least one a=
ccount in which a Lehman device produced a "spurious" signal due to vibratio=
n of the supporting wire.
This should not be a problem unless you=
use a really thick heavy wire. Thin music wire or SS fishing trace are fine=
, preferably in a V to prevent the boom rotating / oscillating axially. The=20=
other main consideration is to have a light but rigid boom. I use 1/2" nom S=
S water pipe with compression fittings, but Al and fairly thin wall brass ar=
e readily available.
Put your pickup coil on the end of the=20=
boom and use a non magnetic mass, brass or lead are fine. If you put a magne=
t on the boom you will see a great number of spurious responses, mostly from=
transients in the utility supply house wiring, fridges, changes in the Eart=
h's field, movements of cars and bikes....
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: Mark Robinson mark.robinson@...............
Date: Mon, 10 Jul 2006 16:19:21 +1200
ChrisAtUpw@....... wrote:
> In a message dated 08/07/06, gold1146@........... writes:
>> Does anyone on this list have schematics, internet links or know of
>> anyone selling this encoding equipment?
> As far as I know all encoders use the XR2206 function generator chip.
http://www.exar.com/product.php?ProdNumber=XR2206
It's worth measuring the temperature response of your finished oscillator.
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help with a Lehman
From: John or Jan Lahr JohnJan@........
Date: Sun, 09 Jul 2006 22:26:58 -0700
At 08:06 PM 7/9/2006, you wrote:
> ...what practical considerations I might run in to if I
> significantly lengthen the boom.
The entire sensor must be shielded from drafts. The longer the boom,
the larger the cover
must be! For amateur seismology there is little point in trying to
achieve a period longer than 15 or 20 seconds. Tilt sensitivity will
limit the period you can achieve without frequent releveling.
John
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Updated Earthworm Modules
From: Larry Cochrane lcochrane@..............
Date: Sun, 09 Jul 2006 22:45:54 -0700
The following message was sent to the Earthworm mailing list...
Hi Everyone,
Last year I created two modules for Earthworm 6.2 and 6.3 that can be used to import
data into EW from my 16-Bit A/D board or my WinSDR datalogger using TCP/IP. These
modules have been updated to support EW Version 7.0. I also created a PSN4putaway.c
file to allow the modules that use the putaway function to save PSN Type 4 event
files. I recompiled the two modules I could find, trig2disk and waveman2disk, that
save event files in various formats to include the new event file format. They are
included in the psn4putaway.zip file.
Please see http://www.seismicnet.com/software.html#Earthworm for more information.
Regards,
Larry Cochrane
Redwood City, PSN
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help with telemetry equipment
From: Larry Cochrane lcochrane@..............
Date: Sun, 09 Jul 2006 23:10:08 -0700
Hi Chris,
There's another problem I forgot to write about. One of the parts, a digital
band-pass filter made by Maxim, is no longer available. When I get some time I will
place the schematic of the board on my website but since one of the ICs can't be
purchased anymore it won't be too useful.
Regards,
Larry Cochrane
Redwood City, PSN
ChrisAtUpw@....... wrote:
> In a message dated 09/07/06, lcochrane@.............. writes:
>
>> You will also need to buy or build a demodulator board other then
>> mine. I no longer
>> sell my USGS Telemetry demodulator board since I never sold enough of
>> them to go into production.
>
>
> Hi Larry,
>
> In that case could you put the circuit diagram on your website,
> please?
>
> This would be most helpful.
>
> Regards,
>
> Chris Chapman
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Mon, 10 Jul 2006 02:36:10 EDT
In a message dated 2006/07/10 , lcochrane@.............. writes:
> There's another problem I forgot to write about. One of the parts, a
> digital
> band-pass filter made by Maxim, is no longer available. When I get some time
> I will
> place the schematic of the board on my website but since one of the ICs
> can't be
> purchased anymore it won't be too useful.
Hi Larry,
Thanks. That would be great!
Maxim produced a new bandpass filter a while back, so I suspect that
there is a replacement. One of the groups monitoring the ionosphere with VLF
radio use it.
Regards,
Chris Chapman
In a me=
ssage dated 2006/07/10 , lcochrane@.............. writes:
There's another problem I forgo=
t to write about. One of the parts, a digital
band-pass filter made by Maxim, is no longer available. When I get some time=
I will
place the schematic of the board on my website but since one of the ICs can'=
t be
purchased anymore it won't be too useful.
Hi Larry,
Thanks. That would be great!
Maxim produced a new bandpass filter a=20=
while back, so I suspect that there is a replacement. One of the groups moni=
toring the ionosphere with VLF radio use it.
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: ian ian@...........
Date: Mon, 10 Jul 2006 16:37:51 +0100
out of interest, what's the spec of how the data is encoded? I'm
wondering if a sound card can decode it.
Ian
ChrisAtUpw@....... wrote:
> In a message dated 2006/07/10 , lcochrane@.............. writes:
>
>> There's another problem I forgot to write about. One of the parts, a
>> digital
>> band-pass filter made by Maxim, is no longer available. When I get
>> some time I will
>> place the schematic of the board on my website but since one of the
>> ICs can't be
>> purchased anymore it won't be too useful.
>
>
>
> Hi Larry,
>
> Thanks. That would be great!
>
> Maxim produced a new bandpass filter a while back, so I suspect
> that there is a replacement. One of the groups monitoring the
> ionosphere with VLF radio use it.
>
> Regards,
>
> Chris Chapman
out of interest, what's the spec of how the data is encoded? I'm
wondering if a sound card can decode it.
Ian
ChrisAtUpw@....... wrote:
In a message dated
2006/07/10 , lcochrane@.............. writes:
There's
another problem I forgot to write about. One of the parts, a digital
band-pass filter made by Maxim, is no longer available. When I get some
time I will
place the schematic of the board on my website but since one of the ICs
can't be
purchased anymore it won't be too useful.
Hi Larry,
Thanks. That would be great!
Maxim produced a new bandpass filter a while back, so I suspect
that there is a replacement. One of the groups monitoring the
ionosphere with VLF radio use it.
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Mon, 10 Jul 2006 13:24:03 EDT
In a message dated 10/07/06, ian@........... writes:
> out of interest, what's the spec of how the data is encoded? I'm wondering
> if a sound card can decode it.
Hi Ian,
It is sent as a narrow band sine wave tone. The channel separation is
only 340 Hz. For the center frequencies see
http://psn.quake.net/onlinedocs/demoddoc.html
Hence the need for a precision encoder like the XR2206.
Does a sound card to have a stability in the low ppm range?
Regards,
Chris Chapman
In a me=
ssage dated 10/07/06, ian@........... writes:
out of interest, what's the spe=
c of how the data is encoded? I'm wondering if a sound card can decode=
it.
Hi Ian,
It is sent as a narrow band sine wave t=
one. The channel separation is only 340 Hz. For the center frequencies see h=
ttp://psn.quake.net/onlinedocs/demoddoc.html
Hence the need for a precision encoder like the XR2206.
Does a sound card to have a stability i=
n the low ppm range?
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: ian ian@...........
Date: Tue, 11 Jul 2006 06:02:30 +0100
Hi,
thanks for the link. I wasn't able to deduce from that page how the
encoding/decoding works (call me dumb!). Is there any other web page
that would explain it?
I note your comment about stability. Will your average radio have
similar stability or does the encoding method mean that that isn't an issue?
Thanks
Ian
ChrisAtUpw@....... wrote:
> In a message dated 10/07/06, ian@........... writes:
>
>> out of interest, what's the spec of how the data is encoded? I'm
>> wondering if a sound card can decode it.
>
>
>
> Hi Ian,
>
> It is sent as a narrow band sine wave tone. The channel
> separation is only 340 Hz. For the center frequencies see
> http://psn.quake.net/onlinedocs/demoddoc.html
> Hence the need for a precision encoder like the XR2206.
> Does a sound card to have a stability in the low ppm range?
>
> Regards,
>
> Chris Chapman
Hi,
thanks for the link. I wasn't able to deduce from that page how the
encoding/decoding works (call me dumb!). Is there any other web page
that would explain it?
I note your comment about stability. Will your average radio have
similar stability or does the encoding method mean that that isn't an
issue?
Thanks
Ian
ChrisAtUpw@....... wrote:
In a message dated
10/07/06, ian@........... writes:
out
of interest, what's the spec of how the data is encoded? I'm wondering
if a sound card can decode it.
Hi Ian,
It is sent as a narrow band sine wave tone. The channel
separation is only 340 Hz. For the center frequencies see
http://psn.quake.net/onlinedocs/demoddoc.html
Hence the need for a precision encoder like the XR2206.
Does a sound card to have a stability in the low ppm range?
Regards,
Chris Chapman
Subject: Re: Help with telemetry equipment
From: "James Hannon" jmhannon@.........
Date: Tue, 11 Jul 2006 07:39:37 -0500
I would expect that a sound card would be stable enough to decode the telemetry signals. All the cards I have seen use a crystal for the reference frequency. As long as the temperature of the card doesn't vary over a wide range you will be ok. The real question is: Is there software avaliable to do the demodulation?
As far as the radio stability is concerned: The signals are transmitted as FM so a slight mistuning of the radio will not affect the frequency of the tones.
Jim Hannon
---------- Original Message ----------------------------------
From: ian
Reply-To: psn-l@..............
Date: Tue, 11 Jul 2006 06:02:30 +0100
>Hi,
>
>thanks for the link. I wasn't able to deduce from that page how the
>encoding/decoding works (call me dumb!). Is there any other web page
>that would explain it?
>
>I note your comment about stability. Will your average radio have
>similar stability or does the encoding method mean that that isn't an issue?
>
>Thanks
>
>Ian
>
>ChrisAtUpw@....... wrote:
>
>> In a message dated 10/07/06, ian@........... writes:
>>
>>> out of interest, what's the spec of how the data is encoded? I'm
>>> wondering if a sound card can decode it.
>>
>>
>>
>> Hi Ian,
>>
>> It is sent as a narrow band sine wave tone. The channel
>> separation is only 340 Hz. For the center frequencies see
>> http://psn.quake.net/onlinedocs/demoddoc.html
>> Hence the need for a precision encoder like the XR2206.
>> Does a sound card to have a stability in the low ppm range?
>>
>> Regards,
>>
>> Chris Chapman
>
>
>
>
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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Subject: Re: Help with telemetry equipment
From: Ian Smith ian@...........
Date: Tue, 11 Jul 2006 13:44:17 +0100
Hi,
labview has some great demodulation software built into it as well as
software to interface with sound cards. That's what I was thinking of
when I wondered how the signal was encoded. Still wondering...
Cheers
Ian
James Hannon wrote:
>I would expect that a sound card would be stable enough to decode the telemetry signals. All the cards I have seen use a crystal for the reference frequency. As long as the temperature of the card doesn't vary over a wide range you will be ok. The real question is: Is there software avaliable to do the demodulation?
>
>As far as the radio stability is concerned: The signals are transmitted as FM so a slight mistuning of the radio will not affect the frequency of the tones.
>
>Jim Hannon
>
>---------- Original Message ----------------------------------
>From: ian
>Reply-To: psn-l@..............
>Date: Tue, 11 Jul 2006 06:02:30 +0100
>
>
>
>>Hi,
>>
>>thanks for the link. I wasn't able to deduce from that page how the
>>encoding/decoding works (call me dumb!). Is there any other web page
>>that would explain it?
>>
>>I note your comment about stability. Will your average radio have
>>similar stability or does the encoding method mean that that isn't an issue?
>>
>>Thanks
>>
>>Ian
>>
>>ChrisAtUpw@....... wrote:
>>
>>
>>
>>>In a message dated 10/07/06, ian@........... writes:
>>>
>>>
>>>
>>>>out of interest, what's the spec of how the data is encoded? I'm
>>>>wondering if a sound card can decode it.
>>>>
>>>>
>>>
>>>Hi Ian,
>>>
>>> It is sent as a narrow band sine wave tone. The channel
>>>separation is only 340 Hz. For the center frequencies see
>>>http://psn.quake.net/onlinedocs/demoddoc.html
>>>Hence the need for a precision encoder like the XR2206.
>>> Does a sound card to have a stability in the low ppm range?
>>>
>>> Regards,
>>>
>>> Chris Chapman
>>>
>>>
>>
>>
>>
>>
>
>--
>Jim Hannon
>http://www.fmtcs.com/web/jmhannon/
>42,11.90N,91,39.26W
>WB0TXL
>--
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
>
>
>
--
Hi,
labview has some great demodulation software built into it as well as software
to interface with sound cards. That's what I was thinking of when I wondered
how the signal was encoded. Still wondering...
Cheers
Ian
James Hannon wrote:
I would expect that a sound card would be stable enough to decode the telemetry signals. All the cards I have seen use a crystal for the reference frequency. As long as the temperature of the card doesn't vary over a wide range you will be ok. The real question is: Is there software avaliable to do the demodulation?
As far as the radio stability is concerned: The signals are transmitted as FM so a slight mistuning of the radio will not affect the frequency of the tones.
Jim Hannon
---------- Original Message ----------------------------------
From: ian <ian@...........>
Reply-To: psn-l@..............
Date: Tue, 11 Jul 2006 06:02:30 +0100
Hi,
thanks for the link. I wasn't able to deduce from that page how the
encoding/decoding works (call me dumb!). Is there any other web page
that would explain it?
I note your comment about stability. Will your average radio have
similar stability or does the encoding method mean that that isn't an issue?
Thanks
Ian
ChrisAtUpw@....... wrote:
In a message dated 10/07/06, ian@........... writes:
out of interest, what's the spec of how the data is encoded? I'm
wondering if a sound card can decode it.
Hi Ian,
It is sent as a narrow band sine wave tone. The channel
separation is only 340 Hz. For the center frequencies see
http://psn.quake.net/onlinedocs/demoddoc.html
Hence the need for a precision encoder like the XR2206.
Does a sound card to have a stability in the low ppm range?
Regards,
Chris Chapman
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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To leave this list email PSN-L-REQUEST@.............. with
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Subject: Re: Help with telemetry equipment
From: "Wayne Abraham" gold1146@...........
Date: Tue, 11 Jul 2006 13:05:22 +0000
Larry
Sad to hear that you are no longer making the telemetry decoder board. It
puts my plans on indefinite hold. I have one of them and have always seen
the need for purchasing a few more but my only drawback was the telemetry
encoder as there is only one telemetered site close to my home. I am a bit
surprised that many of these boards were not sold. How do other psn members
locate local or regional quakes?
I hope that someone can take up on where you left and not only build a
telemetry decoder for sale, but also an encoder.
Wayne
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Subject: Re: Help with telemetry equipment
From: "James Hannon" jmhannon@.........
Date: Tue, 11 Jul 2006 08:05:36 -0500
Each radio signal can transmit up to 8 channels of data. Each channel is assigned a center frequency per the chart below. To send data a tone either 125 Hz above the center frequency or 125 Hz below the center frequency is transmitted. A logic one or zero is signified by the tone being above or below the center frequency. Don't know which. I also have yet to find the bit rate or the exact format of the data being sent. I remember having it all figured out some years ago but can't remember. It seems from Larry's information the data is sampled to 12 bits.
Channel Center freq
1 680 Hz
2 1020 Hz
3 1360 Hz
4 1700 Hz
5 2040 Hz
6 2380 Hz
7 2720 Hz
8 3060 Hz
In looking for information I found this site that offers software to do the decoding with a sound card, not free but:
http://www.geotool.com/geoseis.htm
Jim Hannon
---------- Original Message ----------------------------------
From: Ian Smith
Reply-To: psn-l@..............
Date: Tue, 11 Jul 2006 13:44:17 +0100
>Hi,
>
>labview has some great demodulation software built into it as well as
>software to interface with sound cards. That's what I was thinking of
>when I wondered how the signal was encoded. Still wondering...
>
>Cheers
>
>Ian
>
>James Hannon wrote:
>
>>I would expect that a sound card would be stable enough to decode the telemetry signals. All the cards I have seen use a crystal for the reference frequency. As long as the temperature of the card doesn't vary over a wide range you will be ok. The real question is: Is there software avaliable to do the demodulation?
>>
>>As far as the radio stability is concerned: The signals are transmitted as FM so a slight mistuning of the radio will not affect the frequency of the tones.
>>
>>Jim Hannon
>>
>>---------- Original Message ----------------------------------
>>From: ian
>>Reply-To: psn-l@..............
>>Date: Tue, 11 Jul 2006 06:02:30 +0100
>>
>>
>>
>>>Hi,
>>>
>>>thanks for the link. I wasn't able to deduce from that page how the
>>>encoding/decoding works (call me dumb!). Is there any other web page
>>>that would explain it?
>>>
>>>I note your comment about stability. Will your average radio have
>>>similar stability or does the encoding method mean that that isn't an issue?
>>>
>>>Thanks
>>>
>>>Ian
>>>
>>>ChrisAtUpw@....... wrote:
>>>
>>>
>>>
>>>>In a message dated 10/07/06, ian@........... writes:
>>>>
>>>>
>>>>
>>>>>out of interest, what's the spec of how the data is encoded? I'm
>>>>>wondering if a sound card can decode it.
>>>>>
>>>>>
>>>>
>>>>Hi Ian,
>>>>
>>>> It is sent as a narrow band sine wave tone. The channel
>>>>separation is only 340 Hz. For the center frequencies see
>>>>http://psn.quake.net/onlinedocs/demoddoc.html
>>>>Hence the need for a precision encoder like the XR2206.
>>>> Does a sound card to have a stability in the low ppm range?
>>>>
>>>> Regards,
>>>>
>>>> Chris Chapman
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>>--
>>Jim Hannon
>>http://www.fmtcs.com/web/jmhannon/
>>42,11.90N,91,39.26W
>>WB0TXL
>>--
>>__________________________________________________________
>>
>>Public Seismic Network Mailing List (PSN-L)
>>
>>To leave this list email PSN-L-REQUEST@.............. with
>>the body of the message (first line only): unsubscribe
>>See http://www.seismicnet.com/maillist.html for more information.
>>
>>
>>
>>
>
>--
>
>
>
>
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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Subject: Re: Help with telemetry equipment
From: "Jerry Payton" gpayton880@.......
Date: Tue, 11 Jul 2006 08:19:58 -0500
With all this discussion about telemetery data, how would I find out if
there is a transmitting station near my location? Is there a URL with the
information?
Thanks,
Jerry Payton
With all this discussion about telemetery data, how would I find =
out if=20
there is a transmitting station near my location? Is there a URL =
with the=20
information?
Thanks,
Jerry Payton
Subject: Re: Help with telemetry equipment
From: "James Hannon" jmhannon@.........
Date: Tue, 11 Jul 2006 08:29:14 -0500
OOPS.
I did some more reading of the geotools site and realized that I made a bad assumption about the data format. The information is transmitted in an analog format not digital. So the tone is simply FM modulated with the amplitude of the output from the seismograph. This means that if there is no movement of the seismograph you will see a tone at the center frequency of the channel. The frequency of the tone will follow the level of the seismograph signal up and down within the limits of +/- 125 Hz. Full scale + volts would be a tone 125 Hz greater than the center frequency and full scale - volts would be a tone 125 Hz less than the center frequency.
Jim Hannon
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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Subject: Re: Help with telemetry equipment
From: Ian Smith ian@...........
Date: Tue, 11 Jul 2006 14:53:00 +0100
so for 12 bits bipolar, that's about a 1/16th of a Hz per data number.
Hmm... I'll have a look at the sound card spec sometime.
Thanks
Ian
James Hannon wrote:
>OOPS.
>I did some more reading of the geotools site and realized that I made a bad assumption about the data format. The information is transmitted in an analog format not digital. So the tone is simply FM modulated with the amplitude of the output from the seismograph. This means that if there is no movement of the seismograph you will see a tone at the center frequency of the channel. The frequency of the tone will follow the level of the seismograph signal up and down within the limits of +/- 125 Hz. Full scale + volts would be a tone 125 Hz greater than the center frequency and full scale - volts would be a tone 125 Hz less than the center frequency.
>
>Jim Hannon
>
>--
>Jim Hannon
>http://www.fmtcs.com/web/jmhannon/
>42,11.90N,91,39.26W
>WB0TXL
>--
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
>
>
>
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Subject: ebay auctions
From: Bob Barns royb1@...........
Date: Tue, 11 Jul 2006 10:07:21 -0400
Hi gang,
2 ebay auctions
W.F. Sprengnether Seismometer ATC-T/M-8
Item number: 250006564657
ends July 17
W.F. Sprengnether Seismometer ATC-T/M-8
Item number: 250006564657
ends July 17
Bob
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Subject: Re: ebay auctions
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Tue, 11 Jul 2006 14:29:48 +0000
Hi Bob
Both item that you list in your email have the same ID.
Regards.
--
Jón Frímann
http://www.jonfr.com
http://www.simnet.is/jonfr500/earthquake/
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Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Tue, 11 Jul 2006 10:37:32 EDT
In a message dated 11/07/06, jmhannon@......... writes:
> Each radio signal can transmit up to 8 channels of data. Each channel is
> assigned a center frequency per the chart below. To send data a tone either 125
> Hz above the center frequency or 125 Hz below the center frequency is
> transmitted. A logic one or zero is signified by the tone being above or below the
> center frequency.
Hi Jim,
http://www.geotool.com/geoseis.htm
> This exciting new computer program uses any good quality scanner radio to
> demodulate standard and non-standard telemetry frequencies. The sound card in
> your computer converts the telemetry tone to digital information. The program
> runs under Windows 98, and is anticipated to provide 12 to 16 bit data from
> the telemetry signal. We are truly excited about the breakthrough sound card
> programming technology provided by Silicon Pixels.
Some links were narrow band modulation using the actual seismic signal
and FM modulation, not a digital signal with FSK tones. Hence the 20 ppm
stability of the XR2206. Which critter are we talking about?
Regards,
Chris Chapman
In a me=
ssage dated 11/07/06, jmhannon@......... writes:
Each radio signal can transmit=20=
up to 8 channels of data. Each channel is assigned a center frequency per th=
e chart below. To send data a tone either 125 Hz above the center frequency=20=
or 125 Hz below the center frequency is transmitted. A logic one or zero is=20=
signified by the tone being above or below the center frequency.
Hi Jim,
http://www.geotool.com/geoseis.htm
This exciting new computer prog=
ram uses any good quality scanner radio to demodulate standard and non-stand=
ard telemetry frequencies. The sound card in your computer converts the t=
elemetry tone to digital information. The program runs under Windows 98,=
and is anticipated to provide 12 to 16 bit data from the telemetry signal.=20=
We are truly excited about the breakthrough sound card programming technolog=
y provided by Silicon Pixels.
Some links were narrow band modulation=20=
using the actual seismic signal and FM modulation, not a digital signal with=
FSK tones. Hence the 20 ppm stability of the XR2206. Which critter are we t=
alking about?
Regards,
Chris Chapman
Subject: Re: ebay auctions
From: Jan Froom JDarwin@.............
Date: Tue, 11 Jul 2006 08:01:41 -0700
The other one is item number 260004872887 JF
Bob Barns wrote:
> Hi gang,
> 2 ebay auctions
>
> W.F. Sprengnether Seismometer ATC-T/M-8
> Item number: 250006564657 ends July 17
>
> W.F. Sprengnether Seismometer ATC-T/M-8
> Item number: 250006564657 ends July 17
>
>
> Bob
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
>
>
The other one is item number 260004872887 JF
Bob Barns wrote:
Hi gang,
2 ebay auctions
W.F. Sprengnether Seismometer ATC-T/M-8
Item number: 250006564657 ends July 17
W.F. Sprengnether Seismometer ATC-T/M-8
Item number: 250006564657 ends July 17
Bob
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Subject: Stability of sound cards
From: "James Hannon" jmhannon@.........
Date: Tue, 11 Jul 2006 11:05:55 -0500
Sound cards use a small surface mount crystal oscillator for their reference frequency. These oscillators typically have a stability of +/- 100 ppm over a temperature range of -10C to +70C. This is +/- 0.1 Hz at 1000Hz. Which is in the same ballpark as the 0.061 Hz per step at 12 bits. However the sound card is not very likely to see such temperature variations and there are ways of digitally removing offsets and slowly varying drift from the data.
Jim Hannon
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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Subject: Re: Stability of sound cards
From: "James L. Gundersen" jgundie@.......
Date: Tue, 11 Jul 2006 12:27:59 -0700
> Jim Hannon,
Isn't +/-100ppm +/-0.01Hz at 1000Hz?
Jim Gundersen
----- Original Message -----
From: "James Hannon"
To:
Sent: Tuesday, July 11, 2006 9:05 AM
Subject: Stability of sound cards
> Sound cards use a small surface mount crystal oscillator for their
> reference frequency. These oscillators typically have a stability of +/-
> 100 ppm over a temperature range of -10C to +70C. This is +/- 0.1 Hz at
> 1000Hz. Which is in the same ballpark as the 0.061 Hz per step at 12 bits.
> However the sound card is not very likely to see such temperature
> variations and there are ways of digitally removing offsets and slowly
> varying drift from the data.
>
>
> Jim Hannon
>
> --
> Jim Hannon
> http://www.fmtcs.com/web/jmhannon/
> 42,11.90N,91,39.26W
> WB0TXL
> --
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Re: Stability of sound cards
From: "James Hannon" jmhannon@.........
Date: Tue, 11 Jul 2006 15:36:04 -0500
I sure thought I counted my zeros right. If it is even better.
Jim Hannon
---------- Original Message ----------------------------------
From: "James L. Gundersen"
Reply-To: psn-l@..............
Date: Tue, 11 Jul 2006 12:27:59 -0700
>> Jim Hannon,
>
>Isn't +/-100ppm +/-0.01Hz at 1000Hz?
>
>Jim Gundersen
>
>----- Original Message -----
>From: "James Hannon"
>To:
>Sent: Tuesday, July 11, 2006 9:05 AM
>Subject: Stability of sound cards
>
>
>> Sound cards use a small surface mount crystal oscillator for their
>> reference frequency. These oscillators typically have a stability of +/-
>> 100 ppm over a temperature range of -10C to +70C. This is +/- 0.1 Hz at
>> 1000Hz. Which is in the same ballpark as the 0.061 Hz per step at 12 bits.
>> However the sound card is not very likely to see such temperature
>> variations and there are ways of digitally removing offsets and slowly
>> varying drift from the data.
>>
>>
>> Jim Hannon
>>
>> --
>> Jim Hannon
>> http://www.fmtcs.com/web/jmhannon/
>> 42,11.90N,91,39.26W
>> WB0TXL
>> --
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
>
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
--
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Subject: RE: Stability of sound cards
From: "Keith Payea" kpayea@...........
Date: Tue, 11 Jul 2006 13:43:53 -0700
The easy way to think of it is that 100ppm is 100Hz(0.1KHz) at 1 MHz.
So, divide by 1000, and 100ppm is 0.1Hz at 1KHz.
Keith
-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of James Hannon
Sent: Tuesday, July 11, 2006 1:36 PM
To: psn-l@..............
Subject: Re: Stability of sound cards
I sure thought I counted my zeros right. If it is even better.
Jim Hannon
---------- Original Message ----------------------------------
From: "James L. Gundersen"
Reply-To: psn-l@..............
Date: Tue, 11 Jul 2006 12:27:59 -0700
>> Jim Hannon,
>
>Isn't +/-100ppm +/-0.01Hz at 1000Hz?
>
>Jim Gundersen
>
>----- Original Message -----
>From: "James Hannon"
>To:
>Sent: Tuesday, July 11, 2006 9:05 AM
>Subject: Stability of sound cards
>
>
>> Sound cards use a small surface mount crystal oscillator for their
>> reference frequency. These oscillators typically have a stability of +/-
>> 100 ppm over a temperature range of -10C to +70C. This is +/- 0.1 Hz at
>> 1000Hz. Which is in the same ballpark as the 0.061 Hz per step at 12
bits.
>> However the sound card is not very likely to see such temperature
>> variations and there are ways of digitally removing offsets and slowly
>> varying drift from the data.
>>
>>
>> Jim Hannon
>>
>> --
>> Jim Hannon
>> http://www.fmtcs.com/web/jmhannon/
>> 42,11.90N,91,39.26W
>> WB0TXL
>> --
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
>
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
--
Jim Hannon
http://www.fmtcs.com/web/jmhannon/
42,11.90N,91,39.26W
WB0TXL
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Subject: RE: Stability of sound cards
From: "Jack Ivey" ivey@..........
Date: Tue, 11 Jul 2006 17:48:18 -0400
>Isn't +/-100ppm +/-0.01Hz at 1000Hz?
100 ppm is 0.0001. 0.0001*1000 Hz =3D 0.1 Hz
The other issue with some sound cards has to do with the sample rate
not being uniform due to hardware limitations (poor design). That=20
would show up as noise on the output in this case. There are DSP-type=20
radio receivers out there that use sound cards for digitization, but=20
they choose their sound cards carefully.
Despite all that, I'll bet you can demodulate something that looks
very like a seismic signal with any old sound card and some=20
effort. =20
Jack
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Subject: Re: Help with telemetry equipment
From: Larry Cochrane lcochrane@..............
Date: Tue, 11 Jul 2006 18:32:24 -0700
Jerry,
There probably aren't any stations you could receive in your area. You would need to
check with a local University or other agency that would run a local seismic network.
Most stations are now digital with a direct link to a geostationary satellite or
point to point microwave link, so you can't intercept the signal very easily.
Regards,
Larry Cochrane
Redwood City, PSN
Jerry Payton wrote:
> With all this discussion about telemetery data, how would I find out if
> there is a transmitting station near my location? Is there a URL with
> the information?
>
> Thanks,
> Jerry Payton
__________________________________________________________
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Subject: Re: Help with telemetry equipment
From: Dennis Wieck dwieck@............
Date: Tue, 11 Jul 2006 20:46:23 -0500
Depends on where you are. I can hear at least four different links from
my house ( NW TN). The CERI network here (Univ of Memphis- New Madrid
fault) feeds on 220 range FM links. These then are multiplexed to the
microwave link and subcarrier on an FR radio station that feeds into
Memphis.
Dennis
Larry Cochrane wrote:
> Jerry,
>
> There probably aren't any stations you could receive in your area. You
> would need to check with a local University or other agency that would
> run a local seismic network. Most stations are now digital with a
> direct link to a geostationary satellite or point to point microwave
> link, so you can't intercept the signal very easily.
>
> Regards,
> Larry Cochrane
> Redwood City, PSN
>
> Jerry Payton wrote:
>
>> With all this discussion about telemetery data, how would I find out
>> if there is a transmitting station near my location? Is there a URL
>> with the information?
>>
>> Thanks,
>> Jerry Payton
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Re: Help with telemetry equipment
From: "Jerry Payton" gpayton880@.......
Date: Tue, 11 Jul 2006 20:53:14 -0500
I am in Springdale, AR. That probably is too far.
What frequency do you hear them on. The New Madrid activity was the only
signal that I thought I "might" hear with directional antennas. I'll have
to check with the U. of AR in Fayetteville.
Thank you both for input.
Jerry
----- Original Message -----
From: Dennis Wieck
To: psn-l@..............
Sent: Tuesday, July 11, 2006 8:46 PM
Subject: Re: Help with telemetry equipment
Depends on where you are. I can hear at least four different links from
my house ( NW TN). The CERI network here (Univ of Memphis- New Madrid
fault) feeds on 220 range FM links. These then are multiplexed to the
microwave link and subcarrier on an FR radio station that feeds into
Memphis.
Dennis
Larry Cochrane wrote:
> Jerry,
>
> There probably aren't any stations you could receive in your area. You
> would need to check with a local University or other agency that would
> run a local seismic network. Most stations are now digital with a
> direct link to a geostationary satellite or point to point microwave
> link, so you can't intercept the signal very easily.
>
> Regards,
> Larry Cochrane
> Redwood City, PSN
>
> Jerry Payton wrote:
>
>> With all this discussion about telemetery data, how would I find out
>> if there is a transmitting station near my location? Is there a URL
>> with the information?
>>
>> Thanks,
>> Jerry Payton
>
>
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I am in Springdale, AR. That probably is too far.
What frequency do you hear them on. The New =
Madrid=20
activity was the only signal that I thought I "might" hear =
with=20
directional antennas. I'll have to check with the U. of AR in=20
Fayetteville.
Thank you both for input.
Jerry
----- Original Message -----
From:=20
Dennis=20
Wieck
Sent: Tuesday, July 11, 2006 =
8:46=20
PM
Subject: Re: Help with =
telemetry=20
equipment
Depends on where you are. I can hear at least four =
different=20
links from
my house ( NW TN). The CERI network here (Univ of =
Memphis- New=20
Madrid
fault) feeds on 220 range FM links. These then are =
multiplexed to=20
the
microwave link and subcarrier on an FR radio station that =
feeds into=20
Memphis.
Dennis
Larry Cochrane =
wrote:
>=20
Jerry,
>
> There probably aren't any stations you could =
receive in=20
your area. You
> would need to check with a local University or =
other=20
agency that would
> run a local seismic network. Most =
stations=20
are now digital with a
> direct link to a geostationary =
satellite or=20
point to point microwave
> link, so you can't intercept the =
signal very=20
easily.
>
> Regards,
> Larry Cochrane
> =
Redwood City,=20
PSN
>
> Jerry Payton wrote:
>
>> With all =
this=20
discussion about telemetery data, how would I find out
>> if =
there=20
is a transmitting station near my location? Is there a URL =
>>=20
with the information?
>>
>> =
Thanks,
>> Jerry=20
Payton
>
>
>=20
=
__________________________________________________________
>
>=
;=20
Public Seismic Network Mailing List (PSN-L)
>
> To leave =
this list=20
email PSN-L-REQUEST@...............
=20
with the body of
> the message (first line only): =
unsubscribe
>=20
See http://www.seismicnet.co=
m/maillist.html=20
for more=20
=
information.
>
_____________________________________________=
_____________
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list email =
PSN-L-REQUEST@...............
=20
with
the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.co=
m/maillist.html=20
for more information.
Subject: Re: Help with telemetry equipment
From: ChrisAtUpw@.......
Date: Tue, 11 Jul 2006 23:51:48 EDT
In a message dated 12/07/06, gpayton880@....... writes:
> What frequency do you hear them on.
Hi Jerry,
Go to http://www.geotool.com/geoseis.htm and follow the links. They
are in USGS but take some finding.
Regards,
Chris Chapman
In a me=
ssage dated 12/07/06, gpayton880@....... writes:
What frequency do you hear t=
hem on.
Hi Jerry,
Go to http://www.geotool.com/geoseis.ht=
m and follow the links. They are in USGS but take some finding.
Regards,
Chris Chapman
Subject: RE: Digest from 07/11/2006 00:00:42
From: "Wayne Abraham" gold1146@...........
Date: Wed, 12 Jul 2006 12:38:32 +0000
Hello Jerry
Take a look at this site:
http://gldss7.cr.usgs.gov/neis/station_book/
Wayne
>With all this discussion about telemetery data, how would I find out if
>there is a transmitting station near my location? Is there a URL with the
>information?
>
>Thanks,
>Jerry Payton
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Subject: Re: Help with telemetry equipment
From: "Wayne Abraham" gold1146@...........
Date: Wed, 12 Jul 2006 20:12:30 +0000
Hell all
As we are all looking at telemetry equipment and design, can the experts on
this look at this document and let me know if it is worth anything?
http://www.pnsn.org/SHOP/MCVCO/blkdes.html
Wayne
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Subject: Re: Help with telemetry equipment
From: John or Jan Lahr JohnJan@........
Date: Wed, 12 Jul 2006 16:53:23 -0700
This is the design that was used by the UW and by the Alaska Volcano
Observatory in
the late 1990's. So far as I know, the design worked very
well. Newer stations are
generally all digital and broad band. I assume that many stations
are still using the VCO
technology for regional earthquake monitoring, as the cost is
probably an order of
magnitude less.
Cheers,
John
At 01:12 PM 7/12/2006, you wrote:
>Hell all
>
>As we are all looking at telemetry equipment and design, can the
>experts on this look at this document and let me know if it is worth
>anything? http://www.pnsn.org/SHOP/MCVCO/blkdes.html
>
>Wayne
>
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>Express yourself instantly with MSN Messenger! Download today it's
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>
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Subject: OT: an alternative use for a geophone
From: Nicholas Ward nicholas.ward@.........
Date: Thu, 13 Jul 2006 09:15:09 +0100
Hi,
I realise this is probably not the kind of request you get everyday and
would like to say thanks in advance for any advis