Message-ID: <19185.200101191146@gemini>
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Organization: University of Hertfordshire
To: rsgb_lf_group@blacksheep.org
Date: Fri, 19 Jan 2001 11:50:28 +0000
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Subject: LF: Signals on 137.79kHz
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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