Johnson's Techworld

Trying to compare values shown in Smith Chart in NanoVNA to that shown in Antenna Tuner after tuning antenna for a non-resonant frequency. I was checking my 80m

Received my new automatic antenna tuner just now and I am happy to share the unboxing video with you. It is of N7DDC design. Accuracy of power measurement

Had posted about previous Venus Bounce or Earth-Venus-Earth (EVE) some time back. Now we have news of another EVE. This time from the Dwingeloo telescope. First Venus Bounce

HLF 200 coil did reduce noise on VHF at night, but did it improve reception?

Can this coil control the noise in my radio? See my experiments using this coil of 10m HLF 200 cable on 80m and 40m.

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