Roger G3XBM's (Mainly) Amateur Radio Blog

Whilst rummaging through drawers in my shack trying to find a power supply for an unused PC, I came across this TX. I have no recollection o...

Dave is a real wizard at home construction.  The photo shows his version of GM3OXX 's OXO QRP rig.  It goes to show how neat "one o...

This circuit was originated by GM3OXX , hence the name. It has become a classic circuit. It produces about 1W CW. It has been built by many ...

An OXO transmitter on 14MHz This afternoon I decided to build a 14MHz OXO transmitter . As is often the case, I like to re-use old boxes...

Just to put some perspective on things, this is a small CW transmitter that just about anyone could build for a few pounds only and use it t...

OXO schematic on the G3PTO website One of the most simple and popular HF transmitters is the OXO , originally design by GM3OXX. The cir...