Johnson's Techworld

I have a multi-band fan dipole antenna with elements for 40, 20 and 10m, which can also work on 15m (21 MHz) as the third harmonic of 40m

I was active on 80m in 1980s with my CW/AM homebrew radio and dipole antenna on top of tall coconut trees at my parents’ home. Now in a

I had a feeling that loading coils were eating away the power output of my radio on 80m. I presumed that from the relatively lower SNR noted on

USB printer cable has type A connector on one side meant for the computer and type B connector on the other side meant for the printer. The same

I had posted a query on X asking for the best amateur radio logging software, thinking that there may be only two or three out there. To my

Yesterday I had posted using an example code in Arduino IDE to make an LED on and off every second. Today I found a way to edit the

Even though I have not learned coding, I have completed the first step in using Arduino Nano.

FPGA stands for Field Programmable Gate Array, meaning that it is an integrated circuit which can be reprogrammed after manufacturing. Field programming means programming outside the manufacturing facility

Pin connections of the popular 555 timer IC. Pin sequence is identified using the notch as a marker.

After a lot of effort I have finally achieved SWR of 1.1 for my loaded coil dipole antenna for 80m. Currently it has 12.5m wire on each side