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Re: VLF: QRM?

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: VLF: QRM?
From: Stefan Schäfer <[email protected]>
Date: Fri, 27 Dec 2013 23:42:25 +0100
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Jim,

Do you intend or can you imagine to set up a VLF grabber in Arizona? It could be a good motivating factor for experimental VLF stations in the US and we all can see how the situation looks on your side.
The VLF hype has slowed down since 2010/2011 but i see a consistent comeback and i see that my own motivation becomes a bit more solid :-)
You can see the wideband windows on the grabbers of OK2BVG or DK7FC and the other grabbers. There are several military stations visible all the time, like DHO38 on 23.4 kHz from north Germany.
If you need any help in setting up a grabber, we can do it, no problem. A question of a few hours! It wouldn't be the first one for me :-)
Arizona. that sounds like you have plenty of space for experiments?

73, Stefan/DK7FC

Am 27.12.2013 23:22, schrieb hvanesce:

Thank You Stefan,

 

I’ve opened a window centered on 11904.76190; this will be very helpful, much appreciated.

 

Thank you also for the confirmation of QRM.

 

73,  Jim AA5BW

 

From: [email protected] [mailto:[email protected]] On Behalf Of Stefan Schäfer
Sent: Friday, December 27, 2013 2:51 PM
To: [email protected]
Subject: Re: VLF: QRM?

 

Hi Jim,

Am 27.12.2013 19:30, schrieb hvanesce:

 

[...] but I do not know the offset of my sound card clock; my sound card clock and my low-accuracy reference clock differ by 0.3Hz (+/- 1mHz over short and long time intervals), so until install an accurate clock I can only guess that my clock offset could be +/-1Hz or so. Accordingly the center frequency of the signal shown here could be +/- 1Hz or so from the indicated 8972.81

This question can be answered by tracking the signal on 11904.76190 Hz which came back, today 14:30 UTC.

Is it most likely that the signal in the attached is QRM?

R, CFM.

73, Stefan/DK7FC

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