Catégorie : unid

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

zefzefzzzddfs.jpg fzzz.jpg

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


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


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






Swiss Army? 3075.0 LSB

2 operators active in plain voice tfc + Telematik-Set TmS-430 FSK 110Bd/337Hz modem (zero beat) – measured with SA at 220Bd (but here and here)

TmS-430 messages were encrypted as the voice coordination contained some codes to decode the messages, the operator said.
Callsigns: « SIMBA » & « THERMOS »

The PTT release tone, usually heard from the Swiss:


Sample of the voice coordination tfc:

Expediteur SIMBA 
lieu de départ 40 
date 30 11 16 heure 2002
numero de journal 31136
adresse THERMOS
K18 K54 DE G14 A34 E84 M92 G61 1,0O 26,5N A14 E73 K27 PAR K18
Signature SIMBA
Expediteur THERMOS
lieu de départ PC
date 30 11 16 heure 2005
numéro de journal 10123 
adresse SIMBA
914 A04 495 M16 K45 A60 X80 495 P85 Z46 Z29 M43 G59 6,2N 11,4E
Signature THERMOS


Note: this is not the main frequency, the operator mentionned it. They were waiting for the « Valaisans » to come on the calling frequency (not found yet)


Russian INTEL experiments

Yet another activity this weekend from the Russians
Signals heard on Saturday, 26 and Sunday, 27 2016 with the same cycle:

 0900z 20834.0 USB
 0910z 19649.0 USB
 0920z 18303.0 USB
 0930z 16076.0 USB
 0940z 14477.0 USB
 0950z 13494.0 USB

It was a mFSK-16 at 66Bd, for ~4min30s, no specific preamble (direct mFSK-16 waveform start at 09×0 UTC)


It’s not the first time they use that waveform, I called it « стра́нный-C »
Previously heard at 16.5Bd, 33Bd & 132Bd


update: November, 30
16.5Bd variant data for 6 minutes long

1300z 10174.0 USB
1320z 9243.0 USB
1340z 7663.0 USB

update: December, 1
132Bd variant data for 2min 45sec long

1200z 11557.0 USB
1210z 11083.0 USB
1220z 10161.0 USB
1230z 9267.0 USB
1240z 8097.0 USB
1250z 7563.0 USB

update: December, 4
66Bd variant data for 4min 28sec long

0900z ? (missed) but nearby 20837
0910z 19673.0 USB
0920z 18306.0 USB
0930z 16099.0 USB
0940z 14496.0 USB
0950z 13498.0 USB

33Bd variant data for 3min 53sec long (see December, 1st)

1200z 11557.0 USB
1210z 11083.0 USB
1220z 10161.0 USB
1230z 9267.0 USB
1240z 8097.0 USB
1250z 7563.0 USB


Marconi 25-tone modem activity

update: net active on 6873.5 USB as well (October, 31)

Tonight a station is sending some bursts on 3898.5 USB
It’s the first time I copied that modem, which is not a really recent technology..
And I have no idea which MIL is still using it.

The burst i have copied..

The preamble zoomed


~15557.5u unid digimode (to me)

Spotted today between 2 stations, though a STANAG-4197 or 39-tone at first.. but no

Description below:
4x unmodulated tones (shift 750Hz) during 240ms
3x modulated 75Bd BPSK tones (shift 750Hz) during 160ms
26x modulated 75Bd QPSK tones (shift ~94Hz) + doppler tone ~188Hz below 1st tone


20186 (USB/LSB) narrow mFSK-21/mFSK-13 (update)

The station was active again this morning with a fair to good signal (S6-> S9)
Starting its activity at 0830z on a -250Hz FSK standby leg (20186 CF)
At 0840z it went into a « narrow » 2.6kHz BW USB xmit of mFSK-21 125Hz shift at 31.5Bd approx
Then it went to a « narrow » 3kHz BW USB xmit of mFSK-13 250Hz shift at 31.5Bd too
NB: the other sideband was poorly rejected, as it appeared on the waterfall as an image of the current sideband in use…

Here are some screenshots:

full xmit :   idle FSK > mFSK-21 > mFSK-13 > idle FSK

the LSB image seen with an USB xmit seen on top
the idling FSK leg switch before the LSB xmit shown below




All tfc stopped near 0920z (update, still active from time to time this afternoon)



20186 (cf) wide mFSK-17

Spotted today, switching between carrier & mFSK-17
Perhaps 2 stations active in semi-duplex as the tones had a bit of an frequency offset
100Bd measured – 20kHz approx
Checked on the LPDA, seems to come from 110/140 deg, so middle east !?

Later the unid FSK 50/500 with ACF=127 & ACF=31 near EOT has been spotted on the same CF frequency, wonder if that was just a coincidence as the signal & fading were almost the same (also the sounding frames, tfc <> idle were quite identical)

Here are some screenshots:

20186  20186-2


And finally the 50/500 coming up:


A weird (prob) Chinese digimode

Spotted this evening from home on 10950.0 usb with a low signal, unfortunately
Short description of what I’ve seen & measured:

  • 4 x mFSK-9 at 62.5Bd
  • each xmit starting with 4 x 3 tones, stepping down from highest AF to lowest AF in a row : start sequence consists of tone #8>#5>#2 (mFSK #4) >> #8>#5>#2 (mFSK #3) >> #8>#5>#2 (mFSK #2) >> #8>#5>#2 (mFSK #1)
  • 1x mFSK-17 at 125Bd burst at the end of activity, supposed the burst to unlink the modems

below some pictures: