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splitting datagrams into LDLn Tx Frames
This post is added to complete theprevious one, so to study and verify the way a datagram is splitted to fit the length of the chosen LDLn Tx frame (n =32,64,96,…,512 bytes) and the mechanism used to...
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CIS Navy FSK 50Bd/250 136 bit
Interesting signal from my friend KarapuZ: it's the quite uncommon 50Bd/250 136 Bit by some Cis networks, most likely CIS Navy. The waveform is similar to the well known T600 (50Bd 200/250Hz) but in...
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just banned (although I'm a member...)
UTDX.de banned my IP, although I'm a member and I never posted messages in that forum. Weird behaviors there...
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Logs
05717.0: MER39ALEX: Unid 0536 USB MIL 188-141 2G-ALE LQA REQUEST RESPONSE to ALEX (20Apr17) (AAI)06258.0: ---: Unid 1753 USB R&S GM-2100 serial modem 2400Bd bursts (22Apr17) (AAI)06303.0: ---: Unid...
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STANAG-5066 CFTP messaging over MIL 188-110A
The transmission has been copied on 7788.0KHz/USB and consists of an emails exchange between an Algerian Navy ship (Rais Hamidou) and the Headquarter of French Navy in Toulon (COMTOULON). Messaging is...
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STANAG-4538, point-to-point FLSU_Terminate PDU
Contrary to what one would think, an established 3G-HF PTP (Point-To-Point) packet link is terminated by the called PU rather than the caller PU; in S-4538 terminology, the akronym PU refers to a...
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STANAG-5066, ARQ & non-ARQ PDUs in a real-world HF radio link
The STANAG-5066 standard, and its second generation Data Link Protocol, provides data transfer using ARQ as well as non-ARQ point-to-point, broadcast or multicast data transfer. The Data Transfer...
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STANAG-4538 HDL+, BW7 QAM-16 waveform
- Burst Waveform 6 (BW6) is used to convey the HDLP_DHDR, HDLP_ACK, and HDLP_EOT PDUs of the HDL+ data link protocol, and to convey PDUs of the FLSU and FTM protocols on a packet link established for...
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NATO "copy-and-paste" ...and errors
Computer-based editing can involve very frequent use of copy-and-paste operations but sometimes these operations can lead to significant errors. I came across a case by reading the Annex C to...
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interesting paper about IP Multicasting in HF Radio Networks
I recently found in the web the interesting paper titled IP Multicasting in HF Radio Networks (2008) that proposes a multicast data link protocol for third generation (3G) high frequency (HF) radio...
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CIS 81-81 single channel variant, FSK 40.5Bd/500Hz
this is a single channel variant of CIS T-206-3M (3M1) modem that operates at a speed of 81 Baud in case of two stations are worked (two distinct channels). It's a quite "old" system, most likely in...
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Logs from Tuscany
07500.0: AI1: Algerian Military, ALG 0721 USB MIL 188-141A LQA Request Response to XV1 (10May17) (AAI)07509.0: ---: Unid 0714 USB 2-way FLSU handshake followed by HDL+ datagram (10May17) (AAI)07545.5:...
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RACAL MA4248 "MEROD", ARQ FSK 266.6Bd/800Hz
The transmission was heard on 9274.0 (cf) and consists of FSK-2 bursts with shift of 800Hz and manipulation speed of 266.67 Baud. Thes features points at the RACAL MA4248 device, also known as MEROD...
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Unid 2400Bd QPSK burst system
This mode employ 4-ary phase-shift keying (QPSK) on a single 1800 Hz carrier as the modulation technique for data transmission, the modulation of the carrier is a constant 2400 symbols/sec...
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Doppler spread monitoring in 9 MHz band signals
Looking for "Spectan" software download I come across an interesting web page about the "Precision Carrier Doppler Analysis": intrigued by this argument, I tried to replicate the Doppler spread...
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FSK 100Bd/620, Polish Intel
update (26May17)This morning I copied a transmission on 10211.6 KHz/USB with same ACF (96 bit) but with different frame structure that exhibits a sort of 24-bit length "preamble" followed by 16-bit...
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short log
05825.0: ---: Ukraine Militay, UKR 0618 USB MFSK-4 (double FSK) 100Bd 500Hz,(tones at -750, -250, +250, +750) (18May17) (AAI)06547.0: SHANWICK: Shanwick MWARA IRL 2023 USB/J3E ATC in comms w/004...
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3G link + S5066: example of Circuit Mode (HF2000, Swedish Army)
Nice example of how to send STANAG-5066 data on a 3G link, using the Circuit Mode service provided by the 3G-HF STANAG-4538 profile.The link is established with the 2-way FLSU procedure: the...
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CIS Makhovik ("The flywheel") before CIS-12
CIS Makhovik ("The flywheel") is classified as "vocoder" but can be used also for sending encrypted data. It was originally designed to operate in the UHF but very often is found on the HF as a...
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unid STANAG-4539 burst ARQ system in multichannel mode
This is the Thales HFXL multi-narrow band (MNB) HF modem operating over non-contiguous 3 kHz bands spread over a 200 kHz wide sub-band.The updated post can be read...
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