PSN-L Email List Message
Subject: Re: WinSDR Timing
From: "Larry Cochrane" cochrane@..............
Date: Sun, 18 Aug 2002 18:56:03 -0700
Bob and others,
I like to use the free NTP port for Windows. You can download it from my
site here http://www.seismicnet.com/software/ntp4171.zip or here
The NTP runs as a service and will keep the systems time accurate to a few
milliseconds. It can also act as a time server so it can be used to keep
accurate time on other systems on your LAN. I use it to keep my Win2K
development system's time accurate. Using WinSDR in the Local Time reference
mode you can keep the A/D boards time accurate to within few milliseconds.
You do need a dedicated high speed Internet connection to get these type of
It is important that the time program you use with WinSDR not jerk the
system time around. NTP (and maybe other time setting programs) continuously
monitors and adjust the system time in small steps. If the time program
makes large adjustments, say larger then ~10 milliseconds, the A/D board
will have a hard time trying to figure out what drift is of it's own crystal
oscillator located on the A/D board.
This is what my ntp.conf file looks like. This file should be located in
# NTP configuration file
server montpelier.ilan.caltech.edu # you need to change this to a time
server near you
server ntp1.mainecoon.com # you need to change this to a time
server near you
# directory and name for drift file - you may need to change this line
# directory for stats - you may need to change this line
filegen loopstats file loopstats type month enable
Redwood City, PSN
----- Original Message -----
From: "Bob Hancock"
To: "psn-l@........... com"
Sent: Sunday, August 18, 2002 5:13 PM
Subject: WinSDR Timing
> Has anyone had any experience in the use of Internet timing for WinSDR. I
> am interested in what is considered the maximum timing error that is
> acceptable for amateur seismic work, and also the recommended minimum
> recheck time. In other words how often should the timing server be
> I live in an apartment complex, on the bottom floor. There are numerous
> trees nearby which would block a GPS receiver, and management does not
> an external antenna. I am also experiencing difficulty in getting a good
> WWV signal.
> If anyone has had either good or bad experiences with any particular
> I would also be interested in hearing.
> Thank You
> Bob Hancock
> Randolph, NJ
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