Johnson's Techworld

Yesterday evening I tuned to 20m with my shortened end fed half wave antenna mounted using 3m PVC/CPVC pipes on my first floor terrace. To my surprise several

I used to work on 80m in late 1980s when the solar cycle started going down and propagation on 40m started deteriorating. I made necessary changes in my

We have discussed tuned radio frequency receivers and superheterodyne receivers. Among superheterodyne receivers we have seen both upconverting superhets and the conventional downconverting superhets. Another type of radio

I have been listening to CQ WW Contest stations from yesterday. I found that almost all of them were too fast for me to work. Finally today morning

Stability of an oscillator is the degree of uniformity of frequency of the oscillator when measured over time. Frequency can change with change in conditions like temperature, load

Just tuned in to HF bands on my FT-710. Nothing heard on lower bands or WARC bands. 21 MHz was the most active band with plenty of CW

Lamakaan Amateur Radio Club at Hyderabad, India, which I would call the birthplace of popular BITX QRP SSB radio, is hosting the most anticipated event Lamakaan Annual Radio

PIN diode is a diode with an additional undoped region of intrinsic semiconductor. Usual diodes have P and N types of semiconductors meeting at a junction. For PIN

I have noted that most of the new hams getting licensed in this region are VU3 rather than VU2. You are aware that VU2 has much more exciting

An ESD (electrostatic discharge) protection diode is a type of Zener diode optimized for ESD protection applications. They are a simple and low cost way to protect electronic