Signals, signals and signals
Hamburg, Germany
Joined July 2017
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Roland retweeted
A new version of DecSat has just been released; github.com/CasualArclamp/Decโฆ
Roland retweeted
Radiosondes received over the last 48 hrs by my station.
Potenza, Galatina ๐ฎ๐น; Belgrade, Negotin, Sjenica, Niลก ๐ท๐ธ; Sofia ๐ง๐ฌ; Thessaloniki, Athens ๐ฌ๐ท.
HW: Three @rtlsdrblog v.3 dongles on a @Raspberry_Pi 4 with J-pole Sirio CX 395 antenna + filtered preamp.
SW: radiosonde_auto_rx
Roland retweeted
I had a decant catch up call yesterday evening with Mr DecSat - really interesting! He's looking for sdr's so he can add support! I'm gonna have a dig around to see what I have!, please do the same if you can. There are cool things in the pipeline :-) #decsat
Roland retweeted
VMA Radio Lab: DecSAT Extended into a Multi-SDR Receiver with DVB-T/T2, DAB+ and Analog PAL TV rtl-sdr.com/vma-radio-lab-deโฆ
Roland retweeted
Unid HF FSK with two speeds: a 250 bps โ01โ preamble, then 500 bps data, 1000 Hz shift. Bitstream has 32-bit frames with a fixed phasing bit, like a 2022 signal tied to Kaliningrad by TDoA. A Russian origin is possible, not proven.
i56578-swl.blogspot.com/2026โฆ
Roland retweeted
Simultaneous reception of 3 radiosondes, released from Thessaloniki ๐ฌ๐ท, Niลก ๐ท๐ธ and Galatina ๐ฎ๐น, with the excellent radiosonde_auto_rx software by Mark @vk5qi.
Three @rtlsdrblog v.3 dongles on a @Raspberry_Pi 4.
Sirio CX 395 antenna with Uputronics 403 MHz Filtered Preamp.
Roland retweeted
There is a new release of DecSat github.com/CasualArclamp/Decโฆ - now supports the amazing Airspy RX! Very good tool for picking over Ku / C band data downlinks ;-)
Roland retweeted
DecSAT: A DVB-S/S2/S2X Satellite Receiver with Blind Scanning for the HackRF One rtl-sdr.com/decsat-a-dvb-s-sโฆ
Roland retweeted
The same COMSEC preamble, with a 40-bit fixed block inside a 128-bit IV, shows up on STANAG-4285, MS-110A and STANAG-4539 HF links. Common COMSEC protocol?
i56578-swl.blogspot.com/2026โฆ
Roland retweeted
US Navy stations on MS-110A 600bps/L send short bursts, each opening with a โ01โ run and the same 32-bit word (0x0A6E14DC), then random-looking data. Encrypted traffic or fill?
i56578-swl.blogspot.com/2026โฆ
Roland retweeted
2026-10-04 The ๐ท๐บ ๐ฐ UmKA-1 is transmitting that very short, legendary signal from 69 years ago, as a sign of deep respect for the pioneers of space exploration and its great orbital "ancestor".
๐ ๐ Happy World Space Week to all! ๐๐
The broadcast ends at midnight UTC.
Roland retweeted
2026-10-04 09:54 UTC. Reception of the CW beacon from the newly deployed ๐ฉ๐ช 1P PocketCube ๐ฐ๏ธ ERMINAZ-2U on 435.900 MHz. Replay of recorded IQ with @airspy_com Mini and Yagi antenna in ๐ฌ๐ท.
<CT> HI HI DE DP0PQA! <RN> @amsatdl
Roland retweeted
What If Your ESP32 Could Become an SDR?
ESP-SDR turns supported ESP32 boards into a small software-defined radio receiver.
It gives you access to raw IQ samples from the Wi-Fi radio, letting you see the 2.4 GHz spectrum and waterfall in a browser.
You can explore things like RF signals, spectrum analysis, IQ data and wireless interference without expensive SDR hardware.
The ESP32-C5 is even interesting here because it can work in the 5 GHz band.
A tiny development board suddenly becomes a great tool for learning RF and signal processing.
Would you try SDR on an ESP32?
Roland retweeted
A signal that keeps circling back: alongside the Russian Navy's T-600/CIS-36-50 family, a new candidate at 11592.0 kHz (FSK 41.6 Bd/200 Hz) doesn't quite fit any known configuration: close enough to be a relative, different enough to stay unidentified.
Roland retweeted
RST sported a new mode on S-band last night and having a go at recording to do some analysis later tonight.
Its cyclostationary components are very strong and of great interest to my research.
At over 750000km RST is about half way to the Earth-Sun L2 point.
Roland retweeted
Follow-up: the signal's origin is now confirmed. More interesting though โ the 75bps waveform (S-4415/MS-110A) itself turns out to re-inject its full preamble every 120s, a modification not in the base spec.
i56578-swl.blogspot.com/2026โฆ
