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 ([email protected] from 1600 UTC today and over the
weekend)
-----Original Message-----
From: James Moritz [mailto:[email protected]]
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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