CIS MFSK-68 (34+34)

see: http://i56578-swl.blogspot.it/2016/12/cis-mfsk-64-3232-45bd.html

Unid OFDM 16-tone 75 Bd, 110 Hz (MS 188-110A App.A modified?)

I had this signal via Twente SDR on USB 14301.8 (cf)  on 28/06/15 (1710z) just in the well-known 20 mt reserved band, an that's a bit odd.

The waveform is an OFDM 16-tone PSK, 75 Bd and 110 Hz shift, sent in burst mode. It is very similar to the obsoleted Standard NATO MIL 188-110A Appendix A without the doppler tone @ 605 Hz and in not-continuous mode.

 

OFDM parameters

There is a Chinese variant of the MIL 188-110A 16 channels: it could be this case, but I could not find info or logs about it. The burst mode could lead to something like a selcall waveform but the ~720mS spaced "pips" looks like a TDMA.

Hope to get more info and/or more records.

A short recording can be downloaded from here:

https://www.dropbox.com/s/e27myozxfsua52v/def-websdr_recording_2015-06-28T19_13_33Z_14300.0kHz.wav?dl=0

Unid FSK-8 + PSK-2 1200 Bd (prob. AX-25)

Recordered this morning on 19304.0 USB (central frequency 19305.0) starting from 0937z until 1020z (s/off). The trasmission  heard consists of a series of short messages in PSK-2 1200 Bd (as well as some short bursts) along with 9-tones intervals. Sometimes a PSK-2 100 Bd preamble is sent. 

9-tones and PSK-2 1200 Bd insertions

PSK-2 1200 Bd, carrier ~1060 Hz

the 9 tones, top and bottom @ 7dB higher

PSK-2 100 Bd preamble

The transmission ended with a short CW/Morse message, decoded as "RFM U NIL SK 73" (more likely the '73' stands for greetings, as in HAM world).

 

The same waveform has been reported in radioscanner.ru:
http://www.radioscanner.ru/forum/index.php?action=search&loc=1&forum=21&topic=36750&page=1179863
and it is still un-identified.

Unid FSK 50/500

This signal was heard on 14568.0 (cf) around 1410z, 25 Jun. It's a sync FSK 2-carriers with shift = 500 Hz and baudrate = 50 Baud. ACF160ms with odd 2 bits stop and apparently no start bit.

SERDOLIK sync marker (idling)

24/06/15 16047.0 --- Russian Gov 0918 Serdolik sync marker

The sync marker sequence is sent alone or after a Serdolik Selcall as shown below

Serdolik Selcall and Sync Marker (courtesy of KarapuZ)

Serdolik, as several time reported in this blog, is a complex system used by Russian Gov/Diplo and designed to connect embassies and diplomatic missions. The link below is a little story of this system:
http://www.sozvezdie.su/museum/sura__posolskaya_svyaz_dlya_sssr/ 
Thanks to KarapuZ for the link and the Sedolik Selcall waveform.