PSN-L Email List Message

Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Thu, 07 May 2009 20:30:54 +0000


Thanks for the artical. I ran into small problem, that I have to fix
tomorrow. But the arm that I was trying to use always fell off because
of it's waight. So i did switch to the aluminum one. Using that arm now
gives me 5 seconds easy and clear signal.

However, the signal is at intrestingly narrow band, I am unsure why that

J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:18 +1000, Dale Hardy wrote:
> Hi Jon,
> The "TILT" of your seismometer will determine the period.
> A good reference article can be found here
> regards
> Dale
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" 
> To: "PSN-Postlist" 
> Sent: Thursday, May 07, 2009 12:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
> Hi all
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
> Regards.


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