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| To: | <[email protected]> |
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| Subject: | LF: Re: VLF SIGS |
| From: | "James Moritz" <[email protected]> |
| Date: | Sat, 29 May 2010 20:35:14 +0100 |
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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" <[email protected]> To: <[email protected]> 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 |
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