LA3ZA Radio and Electronics

At my summer cottage (58° N, 9° E), I have two crossed doublets with their centers on the top of a mast as shown in the image. Of course...

I've had a lot of fun with the modified WBR (Wheatstone Bridge Regenerative) receiver which I built Manhattan-style some years ago. Th...

The Elecraft K2 is quite a small transceiver, made for portable use. Therefore it has fewer indicators of status than many other transceiver...

QRPp is radio amateur jargon for communication using a transmitter with less than 1 Watt power output. That’s less than a handheld GSM mobil...

What is the cheapest receiver you can make for VHF? Here is a candidate where all you need to do to modify a small FM headphone receiver is ...

This circuit provides a sinusoidal sidetone oscillator for the Pixie. As an added benefit, it will also cause reduced broadcast interferenc...

Magnetic field lines in the magnetosphere (Ill. NASA) Signals in the 1.8 - 4 MHz range may pass the ionosphere and be ducted in the mag...

The Japanese station JA3YBK was received in Oslo ( press here for audio ), 30. November 2003, 08:20 UTC on 21.004 MHz during the CQ Worl...