Johnson's Techworld

You may remember that some time back I tried to make a loaded coil dipole antenna for 160m, but it did not resonate on 160m even with the

DXpedition by WE9G at Kosrae Island runs from 18th March to- 1st April 2025. That is at a short path distance of 9589.6 km as per QRZ.COM. It

First of all, what is the mystery about this antenna? It was originally designed by John W5GI (SK). Now it is being manufactured by K4TR Antenna Mfg &

When the elements are not electrically isolated from a conducting boom in a Yagi antenna, length of the elements have to increased slightly to resonate on the design

I am going to use the method described by S21RC on his website to measure the characteristic impedance of a coaxial cable using NanoVNA. For this Port 1

Return loss is something similar to SWR while considering the impedance matching of your antenna and feedline. Return loss is related to the reflected signal when there is

Hermes Lite 2 SDR is a relatively low cost direct conversion software defined amateur radio HF transceiver. This QRP radio has a maximum power output of 5W and

Most of you would have heard of STEM education, meaning Science, Technology, Engineering, and Mathematics. According to Wikipedia, the turnaround of Indian economy with comfortable foreign exchange reserves

Nano VNA tracing showed SWR of 1.213 at 14.680 MHz, for a 20m center fed dipole antenna. That was quite above the 20m amateur radio band. I wish

Universal PCB Prototype Board is somewhat similar to the the Solderless Breadboard, but needs soldering of connections. It can be used for testing out circuits for which a