20-27 November – HF logs

003

004

&linkz

Publicités

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.

marconi25
The burst i have copied..

Marconi_preamble.jpg
The preamble zoomed

&linkz

FAF new frequencies ?

Spotted recently:

20806.0 USB FAF CNOA channel ‘CAPITOLE’ & ‘FAF4010’ enroute towards West Africa

8021.0 USB FAF CNOA? channel ‘DAMO10’ with ‘GENERAL’
‘DAMO10’ gave ETA & ETA max to ‘GENERAL’ for him and also for LETHAL31 (unid)
DAMO is known to be the Grumman E-2 Hawkeye from the French Navy carrier Charles de Gaulle, last time I’ve heard him was during the Lybia2011 conflict..

damo_logs
I suppose those 2016 comms belongs to whatever happens nearby Mosul these days..

&linkz

~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
15557_unid_digi
15557_unid_digi2.jpg

&linkz

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:

20186-4.png
20186U_fullxmit.png
full xmit :   idle FSK > mFSK-21 > mFSK-13 > idle FSK

20186-switch
the LSB image seen with an USB xmit seen on top
the idling FSK leg switch before the LSB xmit shown below

20186-LSB.jpg

mFSK-21.jpg
mFSK-21

mFSK-13.jpgmFSK-13

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

 

&linkz

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

20186.png

20186-stuff.png
And finally the 50/500 coming up:
20186-fsk50-500-127-31

&linkz