Johnson's Techworld

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

It has been a long story trying to work VU2TUM on CW ever since he emailed me some time back that we should fix up a sked and

Onam is the most important regional festival of Kerala and is celebrated widely. School students get a 10 day holiday, typically after their quarterly exams. The whole mood

I have connected the 200 ohm impedance side of the DIY balun to the ladder line, presuming 50 ohms impedance of coax on other side. 50 ohms side

Got good SWR match with 4:1 balun on bench test with NanoVNA from 1 -11 MHz. So it should cover 160m, 80m and 7 MHz bands. The final

This is the 4:1 balun which I homebrewed just now for connecting between my recently homebrewed ladder line and a short piece of HLF 200 cable which goes