LA3ZA Radio and Electronics

There is a recommended sequence for multi-band transmission on WSPR. It is given in the K1JT WSPR documentation . If enough receivers follow...

I've had my APRS temperature station running since 2012 . It is based on a DS18S20 sensor that just sticks out of a window. However, aft...

I happened to set my 2m receiver to the APRS (Automatic Packet Reporting System) frequency of the International Space Station (ISS), 145.825...

I have tried several oscillators in the U3S QRSS/WSPR transmitter from QRPLabs. First an analog devices DDS, then a Silicon Labs oscillator ...

It is well known that the sunspots vary over an eleven-year cycle. As the sunspot number increases, the ionosphere is more ionized and radio...

Some years ago I described some AM transmitter experiments for the longwave band from 150 to 300 kHz. A transmitter that worked over a few ...

My  GPS corrected 10 MHz reference now plays beautifully, as I finally was able to continue the project after a long break. All the parts we...

My Elecraft K2  which I assembled as a kit in 2001, has mainly been a CW rig, but now I wanted to use it more for digital modes like FT8 als...