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Showing posts with label AT-3004D/AT-3104. Show all posts
Showing posts with label AT-3004D/AT-3104. Show all posts
31 December 2022

a curious AT-3400D/AT-3104 (CIS-12) modem configuration

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Interesting catch of an AT-3400D modem (also known as CIS-12 or MS-5) running on 14344.0 KHz/USB with the quite uncommon 9 channel configura...
1 comment:
16 September 2019

CIS Makhovik (T-230) in CIS-12 and PSK2/1200bps waveforms

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Recently my friend  KarapuZ gave me the chance to analyze a CIS-12 bitstream and I took the opportunity to wotk on the "format"...
3 comments:
9 July 2018

CIS-12 & CIS Selcall FSK 150Bd/200 ("Vishnya")

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Interesting and quite rare CIS-12 & CIS Selcall FSK 150Bd/200 - aka "Vishnya" - picked up by my friend AngazU using ...
10 June 2018

CIS-12 TDoA measurements using GPS time-stamped IQ samples from KiwiSDRs

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TDOA (Time Difference Of Arrival), also known as multilateration, is a well-established technique for the geolocation of RF emitters. Usin...
26 September 2015

a CIS-20 variant (37.5Bd, 60Hz)

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the so-called CIS-20, in its standard format, is an OFDM 20-tone waveform characterised by π/4-DQPSK modulation at 75 symbols per sec...
28 August 2015

CIS-20 in idle state

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The main features of the waveform, as reported in radioscanner.ru , are: k = 3/5, 20 channels + 1 pilot, channel modulation pi/4 DQPSK,...
1 comment:
21 May 2015

AT-3004D (CIS-12): MPSK 12-tones PSK-2, PSK-4 120 Baud

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CIS-12 is a Soviet military pseudo OFDM 12-tones + 1 pilot tone waveform allowing scrambled voice or data-communication at 120 Baud r...
15 March 2015

CIS-12: an example of link-setup

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heard (or better.. "seen") on 14 March at 10556.0 USB (10558.0 cf) 0740z. I posted the log and a short recording within a short ...