Unid MFSK-7 200Bd 400Hz

This waveform is an MFSK-7 running at 200 baud, the seven tones are 400 Hz spaced. The ACF is 350 mSec then 70 bits long. Looking at its frame (pic. 3,4,5) it seems that 7 bits transport something like data while the other 63 bits have a constant sequence (Sync?).
It looks like a "selective call" and the only think that I could find in the web is a reference to the "AirCal": an MFSK 7 tone system by the old Racal (!?): http://www.scancat.com/rvw-faqc.html 

Well, Racal was taken over by Thomson-CSF and now it's Thales. Although Thales has continued part of the former Racal product line, most products have gradually disappeared along with the name 'Racal' itself. 

The signal was caught by KarapuZ on 10150.0 KHz on USB, around 1540z on 15 July (present year): it's available on request for your further analysis: just email me.

pic.1 - speed

pic.2 grid

pic.3 ACF

pic.4 frame structure

pic.5 FSK demod

CIS-45 v2 HDR modem: modulation switching

16230.0 --- Russian Mil, RUS:

   1412 USB OFDM 45-tone HDR Modem v1, 33.33Bd 62.5Hz DBPSK bursts
   1410 USB OFDM 45-tone HDR Modem v2, 40Bd 62.5Hz pi/4 DQPSK then BPSK stream

Today I heard the CIS-45 OFDM HDR modem running on 16230.0 KHz on USB around 1410z. More precisely, the heard signals were the two well known CIS-45 waveforms: the 33.33 Baud version (v1) in burst mode and the 40 Baud version (v2) in bistream. The v2 modem came with a discrete signal so I decided to record it for later analysis. The signal clearly exhibits the CIS-45 v2 features: baudrate = 40, Sh = 62.5 and BPSK modulation in the channels as in:

http://signals.radioscanner.ru/base/signal230/

http://i56578-swl.blogspot.it/search/label/CIS-45_v2 

I was surprised by analyzing another segment of that signal: the modulation in the channels is no more the expected BPSK but pi/4 DQPSK and still running at 40 Baud. So, it seems that the system has the capability to change the modulation mode (from pi/4 DQPSK to BPSK) on-the-fly, mantaining the same baudrate:

I do not know the reasons of such behavior, possibly an adaptive feature? I searched the web to get some other informations and found that KarapuZ too recently noticed this beahavior: http://www.radioscanner.ru/forum/topic36750-153.html#msg1183165

As the others, this signal is available on request: just email me.

French Navy OMAR HF-NG

09/07/15 14716.6 1OMFUJ French Navy OMAR net Noumea, NCL 0555z USB MIL 188-141A clg 1OMFUM then into THALES TRC-1752 modem Stanag-4285
 
OMAR (Organisation MARitime des transmissions haute fréquence) HF New-Generation program had the task to modernize all the High-Frequency transmissions media of about 80 assets of the Ocean forces of the French Navy, maintaining interoperability with other NATO Navy. The project was committed to Thomson-CSF (now THALES):

http://www.defense-aerospace.com/articles-view/release/3/3377/french-navy-to-upgrade-hf-systems-%28oct.-24%29.html

The ALE calls logged here show the common prefix 1OM (One Organisation Maritime) followed by the usual French Navy IDs:

FUJ = Noumea, New Caledonia
FUM = Papeete, French Polinesia
I do not know if the "1" in the prefix stands for HQ or something other: there are logs that report such ALE calls just w/out any number (OMFUF) as well as calls with a different number (2OMFUM).

About the waveforms, the ALE one is a plain MIL 188-141A while the PSK segments have all the characteristics inherent STANAG-4285 (serial tone carrier 1800 Hz, speed 2400 baud and modulation PSK-8) but they are not recognized by such decoders. 

The lack of PSK strength does not allow an accurate analysis, but given the presence of Thomson-CSF/THALES in the OMAR project, it is very likely that it could be the TRC-1752 modem PSK-8 waveform, as reported here: http://signals.radioscanner.ru/base/signal101/

(I already heard this wavefrom on March http://i56578-swl.blogspot.it/search/label/THALES%20TRC-1752).

Looking for TRC-1752 modem, it seems to be replaced by the new 17xx HF multi-mode modem family:
https://www.thalesgroup.com/en/worldwide/defence/naval-forces/c4isr/communications/hf-multi-mode-modem 

Israeli Navy hybrid modem in DSB/ISB ?

This is the first time that I see the Israeli Hybrid OFDM/Serial modem running on both the two sidebands: I did not analyze the contents of the two signals so it could be a DSB or ISB modulation but in any case the presence of the "supposed" carrier (10164.0 Khz) is quite odd since DSB and ISB does not provide its transmission. So, what I may say about that carrier? does it belongs to the signal?

Although 10164.0 has been reported as belonging to 4XZ Israeli Navy some years ago (precisely in 2013) and the waveform definitely refers to Israeli Navy, this frequency is very often used by the Russian Navy in T600 mode: many logs report such transmissions just on this frequency.

The second interesting point is the offset of the two signals from this "supposed" carrier. The first preamble tone is located at carrier+1000 Hz in the upper band (d1) while it is at carrier-800 Hz in the lower band (d2): ie the two lateral bands are not symmetric with respect to the carrier and that's wrong in AM modulation, other than in dual and independent sidebands.

The strenght of the two signal is just the same, then it is not the case of "fake" signals.

Concluding, it may be that this is something like a test  or something wrong/failure in the transmitter. I will try to pay a look at that frequency, if possible at same time of reception (2135z).

Unid FSK 1200Bd/600 (MSK)

I heard this signal on 14747.0 USB at 0645 (30 Jun 15), it's a  500 mS bursts transmission with Br = 1200 Baud (Fig. 1) and 500 Hz Shift.  The source/user is unidentified. 

According to http://signals.radioscanner.ru/info/item68/ the waveform looks like a classic MSK modulation with Shift = 1/2 * Br, as clearly visible in Fig. 2.

The second harmonic of the MSK waveform (Fig. 4) has two bright spectral lines, the spacing between these lines is equal to Br, that is one of the signs of these modes. This is the necessary condition of their definition at the analysis, but not the sufficient: two lines in the second degree/power can be also given by both SDPSK and OQPSK modes; the constellation (transitions) of the signal is shown in Fig. 5.

Fig. 1

Fig. 2

Fig. 4

Fig. 5