Hello Manuel, |
Nice to see you here again. It is interesting to see how many people
seem to read the reflector, but without writing daily :-)
I remember you saw a trace from me on LF a few years ago.
73, all the best
Am 30.05.2017 11:12, schrieb Manuel Carbonell Alanís:
the signals in 38.0, 40.4 and 44.2 could be Swedish Navy. The last time
I listen them was on Nov-15, with 38.0 and 44.2 kHz in parallel (on/off
at same time)
Bernd DF9RB from the DL0AO team proposed extending the display
range of the wideband grabbers to 48 kHz:
Thereafter, we stumbled upon four unidentified strips on 38.0, 40.4,
42.5, 44.2 kHz. My first thought was that these must be local
interference. But it turned out that they show pronounced nighttime
fading, and they are also visible on Peter's grabber in Kiel:
All four frequencies carry the same 200 Hz wide spectrum. Zooming in
exhibits a fine structure consisting of a number of closely spaced
discrete lines, suggesting modulation with a constantly repeating bit
pattern (see second grabber window at DL0AO). There are occasional
bursts where the signal goes up by 10 dB for several ten
minutes, like yesterday around 21 UT. The red or purple colour-DF would
indicate arrival from East or Northeast.
Any ideas what these may be?
73, Markus (DF6NM)