Russian Military testing new digital modes
Following recordings were done on the 26th of November 2022. Bashnya (Башня) and Gazon (Газону) are testing, which seems to be, the on day frequency. I was not yet able…
Russian Military Communication – Open Microphone on 4230 kHz
On the 13th of October 2022 around 16:00 UTC, I noticed a silent carrier on 4230 kHz USB. It appeared to be an open microphone which was an unaware action…
Russian military radio communication
Frequency Spectrum Heatmap and Timeline Heatmap See https://ukraine.quassi.nl for the live data. Radio communications across the Russian forces are realy poor, which leads to makeshift solutions! Webreceivers to use: http://websdr.ewi.utwente.nl:8901,…
SDR – 868 MHz data from the neighbours
Each minute an RF burst is send into the air somewhere in the neighbourhood of my house at the frequency 868.4 MHz in AM modulation. Is this data intended for…
Decoding amplitude-shift keying (ASK/OOK)
Wireless weather stations, car keys, wireless door bells and several other telemetry devices are transmitting their information into the air in the 433 MHz band. The modulation type which is…
SDR – My 433 MHz door bell
Just for some analysis with SDR and for fun I bought a wireless door bell, a Silvercrest model Z31370B. This is a low power 433 MHz device (LPD433). SDR…
SDR – FM Radio
Today I build my first FM radio. GNU Radio Companion makes the job very easy! I'm reading a 2MHz wide band from my SDR, where I tuned into 100.7 MHz.…
rtl_433
- clone from git git clone https://github.com/merbanan/rtl_433.git - install need cmake apt-get install cmake - install libusb apt-get install libusb-1.0-0-dev - start rtl_433 -a KlikAan KlikUit: *** signal_start = 251271090,…