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STANAG-4538, HDL+ BW7 frame structure
"The HDL+ protocol is used to provide acknowledged point-to-point delivery of datagrams from a transmitting PU to a receiving PU across an already-established HF link, with selective retransmission...
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CLOVER-2000 ARQ mode
This is a full transfer session recorded on 11135.0/USB 1414z between stations HQ4 and GANOB3 (supposedly belonging to an Egyptian network). Link is established and terminated using 2G-ALE 188-141A...
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STANAG-4538, LDL32 transfer bearing a clear-text message
The transmission was heard at 0904z on 11426.5 KHz USB (01 Feb 2018) and it's the first time I meet a clear-text message sent using a 3G-HF xDL protocol, in this case the LDL (Low-Latency Data Link)...
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Logs (10 Jan - 05 Feb, 2018)
04362.0:---: Unid (poss. Italian GdF) 1823 USB R&S GM-2100 modem, proprietary HF waveform (PSK-8 2400Bd) carrying R&S X.25-like protocol (05Feb18) (AAI)04494.0: OZ7: Polish Military, POL 1742...
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unid FSK 400Bd/800 system
Unid FSK system heard around 1005z on 8800 KHz (cf +1200Hz) running at 400 Baud and 800 Hz shift (Figure 1). Unfortunately I went late on the signal so I missed the initial part of the transmission...
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Baudot encoding with 1.5 stop bits (NATO maritime)
All NATO maritime transmissions (BCST, Ship to Shore and MRL) as well as being encrypted, use the standard 5 N 1.5 (1 start bit, 5 ITA2 data bits, and 1.5 stop bits), clearly a not synchronous standard...
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OFDM 20 out of 26 tones modem (possibly a Chinese waveform?)
The transmission has been spotted by ANgazu on 4102.0 KHz/USB by using a remote Kiwi SDR in Sweden. The signals consists of 4500 msec bursts, sent contiguously, and occupies a bandwidth of 2000 Hz...
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A duble [5N2]N1 framing?
In case of an encrypted Async transmission the start bit and the n-stop bits that wrap the text are no more recognizable at the crypto device output, or - at receive side - just after the removal of...
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OFDM 30-tones PSK-2 40Bd
Yet another unid (to me) OFDM transmission spotted by ANgazu on 4 MHz band by using a remote Kiwi SDR in Sweden (SM2BYC). The waveform uses OFDM technology for 30 channels, 50 Hz spaced, modulation is...
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6670.0 KHz, modified 188-110A Serial waveform
A confirm of the modified 188-110A Serial waveform, already heard on 6670 KHz and reported here. The change mainly consists of an added preamble consisting of 4 unmodulated tones at 500, 1500, 1700 and...
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Logs (06 - 23 Feb, 2018)
04221.0: ---: Unid 1811 USB STANAG-4285 600bps/L waveform, sending KG-84 encrypted msg (06Feb18) (AAI)05122.0: NCC7: Unid 0936 USB 188-141A, calling FSE2 (23Feb18) (AAI)05122.0: NCC7: Unid 0936 USB...
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French Navy FUE, STANAG-4285 asynchronous ITA2 framing
Looking at milcomm logs in the web, I noted that the STANAG-4285 clear-text test transmissions of the French Navy call "FUE" from Brest are logged with different indications of the ITA2 data-format...
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DDH7/ DDH9/DDK9 ITA2 FSK and Sorcerer
Following the previous post, I tried the asynchronous FSK decoder of Sorcerer on some 5N1.5 bitstreams transmitted by DWD: precisely DDH7, DDH9 and DDK9. All transmissions are FSK 50Bd/450Hz with 5N1.5...
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CARB-data formats in CTA, IDR, NSS, PBB and TBB transmissions
As a final stage of my ITA2 tour I wanted to take a look at how CARB (Channel Availability and Receipt Broadcast) data are sent. By the way, CARB transmissions typically consist of clear-text...
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some tests with Harris RF-5710A modem
All that passes through the output from the HARRIS RF-5710A modem [1] is the decoded "unknown" data content and none of the raw octets (the overhead added by the HF waveform) will pass; unknown data...
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STANAG-4481 PSK
STANAG-4481 PSK (4481-P) is basically a STANAG-4285 sub-mode which adopts fixed 300 bps data-rate and long interleaving. 4481-P is used by for the NATO Naval BRASS (BRoadcast And Ship-Shore) project....
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about LPC-10 frames (STANAG-4197/M39)
A few days ago me and KarapuZ were discussing about a way to detect/isolate the LPC-10 digital voice encoded frames from a STANAG-4197 waveform and avoid false decoding. I took advantage of an heavy...
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unid 32-bit secondary protocol
The analysis is related to a 3G-HF STANAG-4538 transmission in which the traffic service is “Circuit Mode” and spotted on 7961 KHz/USB, 188-110A Serial is used as the traffic waveform. After...
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unid 128-bit secondary protocol
Interesting (proprietary?) adaptive HF modem spotted on 6670.0 and 7998.5 KHz/USB. The modem uses a waveform set from 188-110A and STANAG-4539 and switches from 300bps up to 4800bps modes with constant...
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WI2XER, Skycast Experimental Radio Station?
Few days ago, 16 March, I spotted on 7703.0 KHz/USB (cf 7704.8) a transmission consisting of 30 unmodulated tones, 100Hz spaced, lasting 20.7 secs and followed by Morse ID “WI2XER”. I wonder if it’s...
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