Mois : décembre 2016

04-11 December – HF logs

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NEW? 1500Bd 4-ary PSK FH system

Recently I have noticed a quite new system active along the spectrum (4 MHz, 6MHz, 8MHz, 12MHz & 18MHz these days)

The net using that one seems to use a slow Frequency Hopping ? or just a Frequency Agility behaviour ?
Bursts are 310ms long, br: 1500Bd, bw: 1800Hz, 4-ary mod

1500Bd-FH-system.jpg
zefzefzzzddfs.jpg fzzz.jpg

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I have no idea which country uses that mode as i have only one 1500Bd QPSK logged so far:

22586.0 CF unid net - digimode trials, 1500Bd QPSK, using various bandwidth 
(500Hz to ~20kHz), bursts of 800ms approx, coming from the north of my QTH 
15/03/2015  19:00:05

&linkz

Russian INTEL experiments

Yet another activity this weekend from the Russians

Signals heard on Saturday and Sunday 10/11 dec 2016 active on Friday 16 also

19374.0 USB 16/12/16
18239.0 USB 10/12/16 11:18
17462.0 USB 10/12/16 11:37
15961.0 USB 10/12/16 12:11
18591.0 USB 11/12/16 8:47 (0845z sked) sun
17414.0 USB 11/12/16 8:50 (0850z sked) sun  
16211.0 USB 11/12/16 8:55 (0855z sked) sun   
17462.0 USB 11/12/16 09:33
20718.0 USB 11/12/16 10:09
20093.0 USB 11/12/16 10:34
18239.0 USB 11/12/16 11:04

It’s not the first time they use that waveform, I called it « стра́нный-E »

5 x mFSK-16 (br:10Bd sh:20Hz) w/ 250Bd BPSK 520ms breaks every 10.12 secs (carrier changes from 2250Hz to 1000Hz) – there are 96 mfsk tones between the bPSK bursts = 9.6sec of data

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This time the specific preamble & tail were sent, shown below:

preamble:

786578.jpg

tail:

87775

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