Recent Posts

War Diaries

A Radio Amateur in Kyiv

This is the story of Volodymyr Gurtovy. An Ukraine lawyer and radio amateur. It is a brutal honest story of a man who first needs to flee Crimea after the Russian occupation in 2014. Now he get’s separated from his family after the Russian invasion in Ukraine in 2022. […]

Bench Probe Storage

This small jig helps keeping your bench tidy while your test probes are still within arms reach. One of the things I have come to appreciate more over time is a well organised workbench. The tools on a fixed location and within easy reach. I once read a quote from someone who claimed that […]

Sensitive Wideband AM detector

Can also be used as RF-millivoltmeter

Published in SPRAT#200

In many of our short wave radios the simple diode envelope detector is used for amplitude demodulation. It is build from a single diode and some passive parts. It is a very low cost and simple circuit block. Because of this favourable characteristics it can […]

Simulating with real audio is awesome and easy!

Use REAL audio to simulate your filters in LTSpice. Two examples are given. A two stage elliptical SSB filter is evaluated. And a two-stage multiple feedback CW filter is tested. Both are ready to include in your receiver. […]

Winner of the G2NJ Trophy !!!

The G2NJ Trophy is sometimes awarded for a really good technical article, and sometimes for an outstanding contribution to international QRP. This year’s winner described a Cross-coupled Double Balanced Product Detector in SPRAT 191. The winner is Cor, PA3COR”Steve G0FUW, Sprat 194

Needless to say it was a complete surprise! I feel very […]