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Logs
04096.0: ---: Unid USB 1835 USB STANAG-4197 ANDVT (07Dec16) (AAI)04378.5: ---: Unid 1805 USB STANAG-4197 msgs (15Dec16) (AAI)04618.0: BP25: German Police vessel Bayreuth, D 1738 USB MIL 188-141 2G-ALE...
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ICAO METARs TAFs sent over MIL 188-141 2G-ALE
This MIL 188-141 2G-ALE session has been copied today 23 Dec. on 09019.0 KHz/USB starting from 1010 UTC. The ALE addresses are: XSS, RAF base in Forest Moor UK belonging to DHFCS-net (Defense High...
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CIS MFSK-64 (32+32) 45Bd
I recently had the chance to have a good copy of MFSK-n signal previously reported here as a MFSK 68-tone (34+34). Well, according to my new measurements, I tend to reconsider it as a parallel 64-tone...
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a STANAG-4285 variant
The STANAG-4285 waveform is well defined by looking at ACF duration and frame structure of the signal (Fig. 1), unless the initial 100msec tones which are not provided by the standard (Fig. 2).Fig....
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unusual PDUs carried by STANAG-4538 BW-5 waveform
Some days ago I was reading 3G-HF transmissions on 11430.0 KHz/USB and one of them caught my attention because of its duration, more than 16 seconds (~16208 msec): too long to be an HDL (max 10240 msec...
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STANAG-4538: an example of a 3G-ALE Asynchronous FLSU call
This recording is a real-world example of a 3G-ALE FLSU (Fast Link Setup) asynchronous call copied on 15062 KHz/USB: although in 3G networks synchronous calls is the preferred mode, async call might be...
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STANAG-4538, HDL+ transmissions on a bidirectional link
According to the different signals strength, two radio stations (also termed Partecipating Units, PUs, in STANAG-4538) alternatively forward their data on the same channel with a fixed interval of...
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PM-SA, the Poor Man Spectrum Analyzer
This is a workaround to get a spectrum-analyzer tool for people like me who run 32-bit PC (real spectrum-analyzer need 64-bit systems).The idea is to capture and store the SDR spectrograms (the...
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Logs
05309.0: ---: Unid 0837 OFDM 39-tone STANAG-4197 messages (03Jan17) (AAI)05405.0: BX01: Algerian Military, ALG 0656 USB MIL 188-141 2G-ALE calling BX02 (04Jan17) (AAI)05708.0: JNR: USAF Salinas AFB,...
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unid FSK 225bps/175Hz system (ALE? selcaller?)
this transmission, most likely a caller or an ALE system, has been copied on 11092.0 KHz/USB (1Khz offset) at 1503 UTC and consists of repeated series of five FSK segments each segments with a duration...
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Logs
05402.0: FC6FEM: Usa-FEMA Region 6, US 0759 USB MIL 188-141 2G-ALE sounding (19Jan17) (AAI)05684.0: JNRNPR: USAF-NIPRnet Salinas, PTR 0807 USB MIL 188-141 2G-ALE sounding (19Jan17) (AAI)05785.0:...
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75bps Baudot encoding with 1.5 stop bits
As in the age of the old-fashioned mechanical teletypes, still today some asynchronous communication systems run at 75 baud using frames consisting of 1 start bit, 5 (Baudot code) data bits, and 1.5...
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3G-2G Switching
another interesting sample of a 3G-2G Switching copied today morning on 7780.0 KHz/USB: the handshake is performed with FLSU bursts in Linking Protection mode (3G-ALE) and user data are sent using MIL...
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a modified/proprietary MIL 188-110B/C Appendix C waveform
It may happen that manufacturers sometimes modify one or more parameters of standard HF waveforms and then obtain proprietary waveforms (and modems) as in the case of these signals, copied today on...
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CV-786 (TRC-75) FSK 75Bd/850Hz bursts
CV-786 is a synchronous wideband FSK mode compliant with STANAG-4481, shore-to-ship RATT FSK 75Bd/850 waveform: in this sample the bursts transport KG-84C on-line encrypted contents. I copied a...
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STANAG-4538: 3G-ALE FLSU calls with Linking Protection
Chasing 3G-HF transmissions in the 11 MHz band I copied several Fast Link SetUp calls carried by Burst Waveform 5 (BW5) payloads that after decoding appeared at least strange. Other than FLSU protocol,...
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Logs
04618.0: BP25: German Police vessel Bayreuth, D 0622 USB MIL 188-141 2G-ALE handshake BPLEZS followed by R&S GM2100 HF modem transporting X.25 traffic (09Feb17) (AAI)05420.0: HN02: Algerian...
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STANAG-4538 "Circuit Mode" (a 3G-2G switching)
an interesting sample of a 3G-2G switching copied on 7780.0 KHz/USB: the handshake is performed with FLSU bursts (ie 3G-ALE) and user data are sent using MIL 188-110A serial (a 2G HF waveform), last...
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