This year at Dayton, as the flea market was concluding on Sunday and I was hunting for last-minute bargains, I came across a few non-functio...

Most of the SB-200 amplifiers (including mine) suffer from "high filament voltage". One theory I've heard is that when the amp...

There are two major changes in Version 2! The first change is purely a mechanical one- no enclosure anymore - the choke is not as compact as...

It is Spirng time and Spring means rain - lots of rain! Yesterday I wanted to use my SteppIR vertical antenna after a couple of months res...

I've updated the diagram to reflect the latest changes in the RF paths / equipment. The main change is the way the output power is mea...

I've been looking for a good coaxial switch for quite some time! I went through the "usual suspects" - MFJ, Daiwa, Diamond and...

The LCR Meter by M-Cubed Electronics is another very nice kit - IMHO - a must for every workbench. The kit is using very high quality compo...

A little known company called M-Cubed Electronix is selling an excellent little kit - PIC based Semiconductor Analyzer. It is one of those ...

Palstar makes some of the best antenna tuners out there! Last year after much research I got their AT2K model. The build quality is simply ...

There is no such thing as a perfect seal! Vacuum tubes (especially high-power transmitting tubes) not used for a few years might exhibit ser...

In most tube amplifiers there are at least a couple of supply voltages which are not regulated! Usually, these are the anode (plate) voltage...

One thing which always bothered me when operating “portable” is the logging process - logging the contacts on paper and then entering them i...