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From: "Talbot Andrew" <ACTALBOT@dera.gov.uk>
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: Signals on 137.79kHz
Date: Fri, 19 Jan 2001 14:19:47 -0000
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Unfortunately, after a power cut Larry's frequency had shifted about 2Hz
lower.  This was partially corrected by midnight where I think he
shifted back upwards again - after I'd retuned 2Hz lower and gone to bed
recording data without checking the signal really was there.  Therefore
no trace this morning - will have to check the new frequency before
setting the recording tonight !  In the circumstances, the 0.6Hz error
may have been genuine.  Bill VE3IQ has been measuring the frequency so
perhaps he can confirm the latest.

If you look narrow enough there are a few signals that show drifting.
Even narrower you can see these signals are spread out, more during
darkness hours than in daylight.   Strong evidence that they are coming
from a long way away.

Andy G4JNT       (G4JNT@THERSGB.NET     from 1600 UTC today and over the
weekend)


> -----Original Message-----
> From: James Moritz [mailto:j.r.moritz@herts.ac.uk]

> Dear LF Group,
> 
> I monitored 137.79kHz +/-5Hz last night - there were signals there 
> alright, 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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