Johnson's Techworld

Simple initial steps in getting Arduino microcontrollers work for you. These can be tried out by anyone having an Arduino Nano.

Arduino group of microcontrollers are used in multiple applications, including the popular amateur radio transceiver micro BITX. I am describing my initial experience and simple experiments with Arduino

I have a 65Ah sealed lead acid battery, which I charge with my 180W monocrystalline PERC solar panel using a Pulse Width Modulation (PWM) charge controller. As part

While learning the basics of inverted V dipole antenna, we are asked to keep the ends of the antenna out of reach for humans and animals. The reason

Gamma match for a Yagi antenna is a way of matching impedance, typically used for antennas with a driven element which is not split into two and mounted

When the satellite moves in space, the orientation of its antenna with respect to the receiving antenna on Earth changes continuously. Antennas with linear polarizations like vertical or

That is the wonder of odd harmonic resonance. 6m or 50 MHz band is roughly the 7th harmonic of 7MHz or 40m band. That is an odd harmonic,

We have just gone through a severe (G4) geomagnetic storm as a result of a solar flare which had occurred on 9th November 2025. There was a G5

C-rate is a measure of the rate at which the battery is to be charged or discharged relative to its capacity. The C-rate is defined as the charge

Large loop antennas use a full wavelength of wire while small magnetic loop antennas use a high voltage tuning capacitor and a small coupling coil. Multi-turn loop antennas