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LF: Signals on 137.79kHz

To: [email protected]
Subject: LF: Signals on 137.79kHz
From: "James Moritz" <[email protected]>
Date: Fri, 19 Jan 2001 11:50:28 +0000
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
Dear LF Group,

I monitored 137.79kHz +/-5Hz last night - there were signals there allright, but exactly what they were is another matter.

Amongst other things, there were 2 continuous traces spaced by about 0.1Hz, virtually astride the nominal frequency. These faded in and out in a DX fashion. Also, there was a train of dashes and spaces of 90s +/- several seconds duration. I estimated the frequency to be 137.7894kHz, give or take about 0.1Hz. These were also fading; there were several short periods of good reception during the night between midnight and 0700, and one long period between 0145 and 0300 when the signal was strongest. I was using DL4YHF's "Spectrum Lab" software, set to 0.042Hz resolution and averaging over 2 FFTs; the SNR with these settings was about 5-10dB, so quite clear.

I don't know if this was VA3LK, the -0.6Hz seems rather large for an error - perhaps Larry could confirm or deny. If they were not VA3LK, it would be worth looking at what frequencies to avoid in future tests. Neither the dashes or the continuous lines were connected with the local Loran, I was able to check this by altering the direction of the loop antenna.
Cheers, Jim Moritz
73 de M0BMU


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