Johnson's Techworld

Yesterday I was trying to check in to AIRNET India at 7.30 pm and I could hear the net control very strong, at 5,9+20 dB. Pressed the PTT

I am quite happy to receive this picture from Amateur Radio on International Space Station using my homebrew Delta Loop VHF antenna just now. One of the best

Demo of the method to receive SSTV from Space Station on 145.800 MHz during a pass of the space station. Timing and direction of the pass can be

An SSTV (Slow Scan Television) event from International Space Station is scheduled to start at 11:50 UTC on 11th November 2024 and will continue up to 18th November

Some time back we have a Google Meet on Fldigi in our LEO Satellite Group, conducted by VU2TUM. Thought of brushing it up once again when VU2NXG told

I had posted about LMR SDR a couple of days back. LMR SDR covers from 160m to 10m band and gives an output of up to 50 mW

Simple way of making a variable resistor with the graphite (carbon) inside a pencil. I my childhood, pencils used be called lead pencils, though I have never seen

Some important features to be looked at in a radio receiver are its sensitivity, selectivity, fidelity, adjacent channel and image interference, automatic volume control (AVC), squelch and signal

We have seen that usual superheterodyne radio receivers have single conversion of received frequency to the intermediate frequency using a single local oscillator and mixer. In many of

Activity on LEO satellites in this region has been low after the peak during the ARISS SSTV experiment. Most of the passes of International Space Station were lonely