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Message-ID: <D60DC081CFC04749A0A40BAF48AC5BF5@JimPC>
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
References: <002801caff4a$19054900$0401a8c0@xphd97xgq27nyf> <005301caff5d$3092d110$0401a8c0@xphd97xgq27nyf>
In-Reply-To: <005301caff5d$3092d110$0401a8c0@xphd97xgq27nyf>
Date: Sat, 29 May 2010 20:35:14 +0100
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Subject: LF: Re: VLF SIGS
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Dear Mal, LF Group,

Everyone can receive those signals in the UK, even with fairly poor 
receiving conditions (actually copying the traffic would be another matter - 
I wouldn't go there ;-)). Most are quite strong, and in a different octave 
of the spectrum from amateur activity, so not really a good receive 
performance check - rather like using BBC R4 on 198kHz as a test for 136kHz 
reception performance. But the frequencies you list are a long way out, a 
few hundred hertz low. There is spectrum display at 
http://abelian.org/vlf/spectrum.shtml with station IDs and accurate 
frequency calibration. Bear in mind that you do need to be able to set the 
RX frequency within a hertz or less, and have much less drift than that, for 
the kind of DX tests that have been done recently. Better in that case to 
dispense with the converter and RX, and just feed the signals direct into a 
PC sound card - frequency errors will be much smaller, and if you are using 
a reasonably large antenna, you probably won't even need a preamp.

Cheers, Jim Moritz
73 de M0BMU


----- Original Message ----- 
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, May 29, 2010 7:31 PM
Subject: LF: Re: VLF SIGS


Does anyone else copy these signals? If not forget about VLF.
g3kev

  ----- Original Message ----- 
  From: mal hamilton
  To: rsgb
  Sent: Saturday, May 29, 2010 5:15 PM
  Subject: LF: VLF SIGS


  Not calibrated
  16.2, 18.1, 19.4, 20.1, 20.7, 21.8, 23.1, 23.8 Khz
  All the above freqs active rtty type sigs and strong.
  nil hrd below 16.2 Khz at present
  No alpha sigs hrd today

  mal/g3kev