Johnson's Techworld

Well, I had not heard till I read the program schedule of LARC-7 today. Most of you would be familiar with uBITX which has gone up to version

Slim Jim antenna, as the name implies, has a very slim design and hence very little wind loading. JIM stands for “J Integrated Matching” as it uses a

Inverted V antenna was the first ever antenna I built nearly four decades back, with a two copper wires and a wooden pole. It was fed by just

Covering almost everything an amateur radio operator should know about SWR or standing wave ratio. Takes you through the basic concepts about SWR, how to connect the SWR

My quarter century old TH-22 AT hand held radio had been in shelf for quite long. Battery pack was misplaced and I had a battery box supplied by

My amplispeaker cum FM radio does not have a volume control. So receiving FM stations can be a distraction to others at home. As I want to experiment

TVS diodes or transient voltage suppression diodes are electronic components used to protect electronic devices from voltage spikes induced on connected wires. TVS diodes acts by shunting excess

Last year I had posted that AMSAT-OSCAR 7 (AO 7) was nearing its Golden Jubilee. AO-7 has completed 50 years of operation as an amateur radio satellite on

Folded dipole can be considered as a dipole antenna on top of which a loop of conductor is added so that it will be short circuiting any direct current fed

I had posted about my quarter century old TH 22AT radio a few days back. Now I am trying to figure out how to open it up and