Author: Johnson Francis

Had a search for the QSL cards which I had received during my first stint on ham radio decades back. These are the precious ones I could fish

End Fed Half Wave dipole antenna has a high feedpoint impedance of the order of 2500 ohms. It is transformed to the 50 ohms impedance needed for the

I had mentioned about ESP32 microcontroller during the discussion on Standalone Versions of LMR SDR. ESP32 is a series of low-cost, low-power microcontrollers that integrate both WiFi and

Both overcharging and undercharging are not good for the lead acid battery which we commonly use in this region at home. Overcharging with high voltage will cause current

This is my new sealed lead acid battery. Difference from conventional flooded lead acid battery is that the electrolyte is in gel form instead of the liquid form

Let us have a look at the chips and some other components seen on the Arduino Uno board. This is the ATmega328 on the Arduino Uno board, about

I have tuned my 40m fan dipole for 30m using my ATU-100 automatic external antenna tuner. It shows a residual SWR of 1.65, and antenna efficiency of 94%

First I tried to tune my 40m fan dipole which has also elements for 20 and 10m, for the 160m band. The SWR was 1:9.9, probably the maximum

Meteor Scatter is a special mode of propagation in which the ionization of atmosphere produced by the meteor trail refracts 10m, 6m, 2m and sometimes UHF signals so

Arduino Uno is an open-source microcontroller used for controlling and interacting with various components like LEDs, relays, sensors and motors. It can be interfaced with other Arduino boards