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TADIRAN HF modem running in MFSK-4 + scrambler mode
TADIRAN HF modem, probably the HF-6000 model, running in COMSEC mode using MFSK-4 125Bd/300Hz and scrambled voice-comms. Transmission heard on 5885.0 KHz/USB at 0755z with a very poor SNR. The sample...
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Radio Teleswitch, an example of AM Signalling System (AMSS)(by ANgazu)
BBC Radio-4 (LF 198 Khz) is a radio station that broadcasts a great variety of programs. At first glance, it looks like any other AM commercial emitter, but there is a feature that makes it different:...
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BPSK 4800,9600,19200Bd 6,12,24 KHz (Marine Band)
Other WideBand burst waveforms spotted in HF Marine band: speed 4800, 9600 and 19200 Baud, bandwidth 6, 12 and 24 KHz.Fig. 1 - 16625.0 KHz/USBFig. 2 - 16657.0 KHz/USBStill uncertain whether these...
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strong 4+4 π/4 DQPSK 75Bd Chinese modem
Strong copy of the 4+4 DQPSK 75Bd Chinese modem on 17149.7 KHz/USB at 0915, 1128 and 1129 UTC. Fig. 1Fig. 2Fig. 3 Note the different periods in preamble (36-bit length) and data segments (12-bit...
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Logs
04488.0: ---: Unid 0543 USB TADIRAN HF modem MFSK-4 125Bd/300Hz autocall (19Oct17) (AAI)05270.0: IDR: Italian Navy S.Rosa Rome, I 0715 J3E/USB radio check with Filone, Bussola, Orale, I0951 (07Oct17)...
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unid STANAG-5066 RCOP/UDOP client, Swedish Army "C2" integrator? (tentative)
last update: 11 October 2017As said in the previous post, in all the monitored transmissions the chosen 3G-HF service is the Circuit Mode, and 1200 bps MIL 188-110A is the used traffic waveform. Data...
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Japanese Navy "Slot Machine" w/ traffic forwards
Japanese Maritime Self-Defense Force ashore transmission from Ichihara, also known as "Japanese Slot Machine" (Enigma Designation XSL), with traffic segments heard on 8590 KHz. Modulation used is QPSK...
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Swedish Army 8-bit text ACP-127
Some days ago my friend Guido pointed my attention on two fixed-frequency services, 4228.0 and 4396.0 KHz on USB, which in some way are in connection with the unid S-5066 RCOP/UDOP protocol used by the...
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Maritime Interdiction Operations (MIOs) in Med'sea, a joint exercise?
The heard communications concern a Maritime Interdiction Operation (MIO) in Mediterranean sea and involve 2 vessels and one ashore station which acts as the net-control station by coordinating all the...
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radiosonde Vaisala RS92-SGP(by: ANgazu,Rapidbit)
The RS92-SGP has been manufactured and marketed by the Finnish company Vaisala since 2003. It incorporates a Helix Antenna (QFHA=Quadrifilar Helix Antenna) for the reception of GPS satellites.This type...
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CIS Selcall "Vishnya", FSK 150Bd/200
I spotted this short transmission on 7823.5 KHz/USB at 0827z, it's an FSK modulation with 200Hz shift and speed of 150bps. I asked my friend KarapauZ about the name of this system and he told me that...
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SkyOFDM 28-tone, 65.6Bd BPSK, 2.6KHz bandwidth
These transmissions have been spotted during the last weekend on 4155.0 KHz/USB by ANgazu using a remote KiwiSDR located in Norway.The waveform has a bandwidth of 2600 Hz and use OFDM technology for 28...
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SIGFOX, UNB IoT by Angazu & Rapidbit
SIGFOX [1] is a signal for Internet of Things (IoT) with some features that predict a great future. The use of the spectrum, adapted to its purposes, does not waste resources as other systems do. Its...
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logs
05547.0: ---: Unid 2231 USB 3G-HF 2-way FLSU handshake / HDL24 transfer (06Nov17) (AAI) 05838.0: ABC7: Croatian Military, HRV 0924 USB 188-141A handshake ABK4 / radio-check (14Nov17) (AAI) 06205.0:...
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Baudot FSK 50Bd/100
.This FSK transmission was copied on 6330.8 (cf) at 1128z: shift is clearly 100Hz while some problems arise when measuring the speed. Indeed, the measurement of the speed based on FFT may fail in case...
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a MS-110A modem running in ASYNC mode
This is a sample of MIL-STD 188-110A Serial 75bps/L modem working in ASCII ASYNC mode and transporting a Citadel encrypted file. The transmission was heard on 7413.0 KHz/USB following a 188-141A...
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2017 last logs
04158.0: ---: Unid 1035 USB Skysweep Technologies proprietary waveform, OFDM 28-tones BPSK 65.6Bd (22Dec17) (AAI)05215.6: FUO: French Navy Toulon, F 0810 STANAG-4285 1200bps/L encrypted pseudo-random...
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MFSK-4 session using 250Bd/500Hz & 160Bd/320Hz
Interesting MFSK-4 transmission recorded by my friend Mike (Mike Cache-Ortiz, mco) on 17423.0 KHz/USB: during the session the mode (speed and separation) changes from 250Bd/500Hz to 160Bd/320Hz (Figs....
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MFSK-11 125Bd/250Hz waveform
Unid MFSK-11 waveform spotted this morning on 7973.0 KHz on USB, already heard on March 13, 2017 (same frequency) and March 23, 2016 (9300.0 KHz). The waveform is an 11-ary frequency shift keying...
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(differential) FSK 75Bd/200Hz
Unid and quite rare FSK system running at 75Bd and using a 200Hz shift, heard on 4540.0 Khz (central frequency) around 1755z. The measured ACF is = 0 but I went on this transmission after its start, ie...
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