Mois : mars 2015

24-30 Mar – HF logs




French Navy STANAG-4285 streams (replacing FSK-2)

I have noticed this weekend that the usual FSK-2 sent by the French Navy are no longer in use, looks like they were replaced by STANAG-4285 @ 600L (crypto.. of course..)

Those STANAG-4285 are easily recognizable on a waterfall because they have a ticking noise on each edge of the 2400Bd 8-ary waveform as shown on the screenshots below:

4325.0 USB & 4338.0 USB on this one.

4325.0 USB & 4338.0 USB   &   6430.0 USB on this one.

note1: the ticks aren’t sync..
note2: 8517.0 USB & 16966.0 USB are also impacted by that modification


18802.0 USB 600Bd BPSK? datalink


No idea on that 600Bd stuff, active between 2 stations, does sounds like a packet link.
Signal was much distorded on the strongest station TX as you can see on 1st screenshot.
I saw a background noise that makes me think 18802.0 USB is the correct frequency.