Johnson's Techworld

Metal Oxide Varistor is often used as a surge and spike protector in electronic circuits. They function by shunting the extra current as their resistance drop markedly beyond

Recently a viewer asked me whether I had opened the extension board with multiple sockets and spike protector and mentioned that they contain Metal Oxide Varistor (MOV). Had

I have been having difficulty in tuning my 10m long ladder line to my 40m nearly folded dipole antenna. Searched and found a good reason on KV5R.COM. Lengths

Today evening I was quite surprised to hear a very strong signal on 20m from VU2GNL, just 283.6 km from my location. That was on 14.215 MHz at

Desoldering wick is also known by other names like desoldering braid, solder wick and solder braid. It can be used to remove solder from the printed circuit boards.

All of us will be familiar with inorganic semiconductors like silicon, germanium and gallium arsenide. But most of us may not be familiar with organic semiconductors. Yet you

Most of the new cars are moving to shark fin antennas from the older whip antennas. Read that BMW began to use shark fin antennas on their vehicles

All new Real Time QSO Manager from QRZ is now available for public beta testing. I had the opportunity to be an initial beta tester, thanks to the

My multi-band fan dipole antenna was not working after heavy rains. I was not able to get even local contacts on 40m, though the antenna was ‘tunable’ with

Amateur radio transponder on International Space Station sends out Morse Code beacon mentioning NA1SS frequently so that you may be able to hear it once during a typical