Johnson's Techworld

The power handling capacity of a 1:1 current balun on a toroid is primarily determined by its ability to manage heat dissipation and avoid magnetic core saturation. The

As scheduled yesterday, VU2MV and myself joined on 7035 kHz at around 745 am, which was the roundtable frequency with VU2JN and others four decades back. VU2JN was

I have an HP printer which can also scan documents and print them. It is Wi-Fi enabled so that you can also print from your mobile phone which

After an initial discussion on 40m today morning, followed by a couple of email exchanges, myself and VU2MV are planning to revive the old roundtable which we used

Today morning, I could check in to several 40m nets as usual, with good signal reports both ways. After that I settled for a QSO with VU2MV, my

I am using a 200W car inverter to run the pedestal fan in my radio room. The same car inverter can be used to charge my laptop from

While technically Meshtastic is not ham radio as it uses unlicensed ISM (Industrial, Scientific and Medical) bands like 900MHz or 868MHz, this is the biggest crossover topic in

Welcome to the world of Amateur Radio (often called Ham Radio). This is a hobby that blends technology, geography, community, and public service. Whether you want to talk

One of my viewers mentioned that he prefers a sleeve dipole constructed from RG316 coax in a flat top configuration. Though it is end fed, it has a

I came across IRLB4132, an N-channel MOSFET in my UPS. That was a 600VA, 300W UPS which I had used for my desktop computer. I no longer have a desktop and