Johnson's Techworld

Wireless router range extender can be used at home when there is no good connectivity from the home internet wireless router to all the rooms. This router has

Light emitting diodes or LEDs produce light when electrons combine with holes in the semiconductor, releasing energy as photon. First ones to be produced were infrared and red

Many of you would have noticed that some of the modern cars have a ‘shark fin’ antenna, quite different from the whip antenna seen on older cars for radio

Capacitors were also called as condensers earlier. Even now, capacitor mics are known as condenser mics! The ones which I am showing are electrolytic capacitors with a polarity.

Happy to work 9W8ZZK from Borneo Island (3964.8 km) on 21.285 MHz SSB. He was coming here quite strong and I wondered why – He is on 50

First Contact on the ‘Rare Bird’ UVSQ-SAT, with VU2TEK! The satellite was at 600 km distance and elevation was 30 degrees, when I heard VU2TEK during the pass

Today evening by about 5.30 pm local time, I could see several signals on the waterfall on 40m, which was quite unusual. In the morning hours 40m band

UVSQ-SAT is activated only rarely. That is why I have called it as a ‘Rare Bird’! Now it has been activated for 48 hours starting from 0000z on

UVSQ-SAT is a CubeSat which was launched on 24th January 2021. Though it was initially mentioned that UVSQ-SAT team will provide an availability of the transponder up to

HRC fuses are High Rupturing Capacity fuses. Older types of fuses used a simple wire which would melt and even burn off when a certain level of current