Johnson's Techworld

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

I had posted about measuring length of coax using NanoVNA with the transform function. In that method, we use the velocity factor of the coax in percentage. If

Fed up with the S9 or more noise in my radio most of the time, I was thinking of buying battery and testing whether working on pure DC

Coax length is measured using the transform function and the S11 port of the NanoVNA. What we get is either the length of the cable or the distance

PIC16F1938 is the microcontroller used in this antenna tuner. It is an 8 bit CMOS microcontroller with clock speed of 32 MHz. CMOS stands for Complementary Metal-Oxide-Semiconductor. A

NanoVNA is a very hand and relatively inexpensive Vector Network Analyzer which can be used to optimise the performance of the antenna. Here we will see how the