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
|
