LA3ZA Radio and Electronics

Step-down converter based on LM2596. Note the damaged chip Ok, now I've done the test. My QRPLabs U3S runs off a 12 Volt power supp...

Tandberg Huldra 10 Tasos, SV8YM, has written about " The Mysterious Case of the Withering Filters ". This seems to affect not ...

These last few days I've been experimenting with my QRPLabs Ultimate 2 and Ultimate 3s transmitting on 7 MHz. In addition to WSPR, the ...

My friend Alf, LA2NTA, has sent me these screenshots from when he has been operating FT8. The first image is when operating 10 meters and to...

The Chinese Pixie transceiver operating at 7023 kHz has become very popular. It often costs less than 5 USD on Ebay. Like most Pixies it is ...

Ultimate 3S with 5-band relay module in front, variable LM2596 power supply (with voltmeter) for the power amplifier  behind left, a va...

The last issues of QEX have featured two interesting articles by Gary Cobb, G3TMG. He outlines the advantage of using Zolotarev designs for ...

Does the world need more Arduino clocks? Maybe not. But I needed another Arduino project as I had made a K3NG morse keyer . I love this ke...