Another long transmission last night from Dex.
Signal and noise at Forest, VA - KE4RJQ at range 254km
http://abelian.org/vlf/tmp/141217a.png
The drop-outs at 03:20 and 08:00 were caused by interruptions
of the stream from Forest. This very low noise rx uses an
optical link for isolation from domestic/mains interference.
You can read about it in this article
http://www.vlf.it/smith1/opticalink.html
on Renato Romero's web site.
Europe S/N ratios and phase in 278uHz bandwidth
Cumiana Bielefeld Todmorden
7173km 6918km 6194km
21:00 -9.1dB -2.2dB 4.7dB 154.4
22:00 1.7dB 80.9 -8.3dB 9.8dB 166.4
23:00 2.0dB 92.8 4.7dB 114.2 11.8dB 89.9
00:00 2.8dB 15.4 3.7dB 60.0 11.4dB 115.7
01:00 -4.0dB 6.9dB 84.0 9.8dB 103.2
02:00 -8.2dB 0.6dB 11.5dB 86.3
03:00 7.5dB -23.5 0.5dB 8.6dB 147.1
04:00 5.2dB 82.4 -0.3dB 10.5dB 127.1
05:00 6.5dB 79.2 5.9dB 127.4 13.8dB 117.3
06:00 6.0dB 38.7 6.1dB 138.1 13.1dB 113.2
07:00 1.4dB 7.3dB 68.6 11.9dB 125.5
08:00 0.9dB 5.2dB 175.1 14.6dB 130.0
09:00 -3.9dB 4.5dB 92.4 9.9dB 154.7
10:00 4.2db -107.9 7.3dB -155.7
11:00 3.4dB -33.3
Signal in Todmorden was its regular strength,
http://abelian.org/vlf/tmp/141217b.gif
and is good enough to come out well on a spectrogram
http://abelian.org/vlf/tmp/141217c.png
Unfortunately reception further into Europe was poor last
night with barely a glimmer of signal - not enough to make
any sort of plot I'm afraid.
--
Paul Nicholson
--
|
