SDR

Russian Military Radiograms are encrypted radio communications used by the Russian military and intelligence agencies for the transmission of sensitive information. These radio transmissions typically use a combination of numbers, letters, and other codes to convey encrypted messages. The specific encryption techniques used by the Russian military are not publicly known, and the messages are […]

On November 26th, 2022, I made the following recordings: Bashnya (Башня) and Gazon (Газону) were conducting tests on what appears to be the day frequency. However, the night-frequency has yet to be determined. It is possible that the F42 frequency may be used for this purpose. The tests were active on 3305 kHz and 5097 […]

On October 13th, 2022 at approximately 16:00 UTC, I observed a silent carrier on 4230 kHz USB. It became apparent that this was due to an open microphone, which was most likely caused by the female Russian operator’s lack of awareness. The microphone remained open for roughly two hours, during which time the operator was […]

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: List with WebSDRs: List with Spyservers

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 me? I dont know, so I would like to figure it out… ;-)

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 used for these devices is mostly amplitude-shift keying, ASK. The most common ASK form is On-off keying, OOK. The following signal is transmitted each minute […]

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 Sharp Quickly after starting up SDR Sharp, tune-in to the 433 MHz band, and pressing the button of my door bell, I had the following […]

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. The following shows a part of the FM spectrum: The Audio spectrum gives me this, including the pilot signal at 19kHz which indicates that there […]

– 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, signal_end = 251291121 signal_len = 20031, pulses = 1 Distance coding: Pulse length 30 Short distance: 1000000, long distance: 0, packet distance: 0 p_limit: 30 […]