LA3ZA Radio and Electronics

Like many I was disappointed with the Chinese antenna tuner kit "QRP manual days" back in 2014 and I never really got it to work. ...

Image: QRPGuys.com Some time ago QRPGuys approached me and asked if they could make the low-power zero-beat indicator that I made many y...

Being spotted by the designer of my WSPR transmitter must be the ultimate WSPR spot! Perhaps only surpassed by being spotted by the design...

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 ...

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

My own surface mount version of the Pixie2 Here's a guide  in table format to minimalistic single-band amateur radio transceivers. T...

The trusty old LM386 audio amplifier from the 70's is still used a lot in low power and portable equipment. Recently some ultra high gai...

Here's a design for a 1 MHz amplitude modulated (AM) transmitter. I've been looking a while for something like this, a simple shor...

My Elecraft K2 which is now more than 11 years old (serial #2198) has served me well, even earning me QRP DXCC  (100 countries with 5 Wa...

Transceivers with a power supply of 1 and 2 Volts, how much can one achieve with that? Well, actually quite a lot according to DL2AVH, Hel...

Output stage of the 1 Volt DL2AVH transmitter (from http://www.lichtnetzwerk.de/1volttxvr_dkumentation.pdf ) I am intrigued by minimali...

AT Sprint rig in an Altoids box, itself contained in a video case. Digital voltmeter in lower left corner shows 12.0 Volts. (Click for l...

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...

Photo: LA8EKA The AT Sprint is a very nice limited edition surface mount CW transceiver designed by KD1JV Steve Weber . The printed cir...

My Minimal-Art-Session rig shown here was made for class B of the QRP-MAS competition which is in May every year. In class B the trans...

My 75 meter horizontal loop antenna is tuned by a home-built Z-match antenna tuner, a slightly modified version of the Norcal BLT (Balan...

From Wikipedia Commons, author 'Samba pa ti' The LM386 must be one of the most popular audio output amplifiers among radio amat...

This is a circuit that builds on KR5L’s zero-beat indicator circuit. He suggested trying a CMOS version of the 567 instead of the standard b...