Roger G3XBM's (Mainly) Amateur Radio Blog

One of the aspects that I enjoyed was seeing how few parts were needed to make QSOs. This is one of the simplest circuits. See  https://site...

  Many years ago I experimented with this QRP transceiver circuit on 80m CW. It is hard to find anything much simpler! See  https://sites.go...

This has been on before, I know. Some years ago, I wanted to see how simple one could make a rig that actually worked. There is no doubt at ...

As Jason M0NYW has kindly done a PCB layout and provided the Gerber files, I was hoping to add a link to these on my website, but I cannot ...

One of my Facebook memories this week was of some QSOs over 100 miles by AA1TJ using my little XBM80-2 transceiver in 2010. I did not reali...

If you get bored this holiday, you may get some ideas from the  XBM80-2 transceiver on my website. It really works!! You would be hard pres...

Today, I had an email from somebody in the Netherlands about this transceiver.  He was getting no audio. Recently someone told me that cryst...

Many years ago, I built the XBM80-2 80m CW transceiver. It never got cased, but shows how simple a transceiver can be! Somewhere recently I ...

As mentioned before, there is often a compulsion to get results with the fewest parts. Usually, this involves a compromise, often with the R...

  Yesterday, I posted the 10m Lesser Chirpy. This was based on the 80m XBM80-2 QRP CW transceiver which is shown here.  You would be hard pr...

This was a very simple 80m CW transceiver that I designed and built many years ago, apparently in 2010. Like all my designs please take th...

I received this yesterday from Martin G0PJO: Hi Roger, G0PJO's rig in the field I thought you might like to know that the QR...

A few more people have been making the XBM80-2 transceiver. One is Alan Yates VK2ZAY who has made a de-luxe version with some refinements a...

Trying to do a small PCB for the XBM80-2 80m micro-transceiver using the Sprint Layout 4 PCB layout package I hit a problem: wanting to use...

A short video about the XBM80-2 80m CW micro-transceiver. This is built "ugly style" on a piece of copper clad board. It will ge...

A few small value optimisations have improved the XBM80-2 transceiver. I've optimised the collector circuit values and this has resulted...

This evening I tried listening for my 60mW CW signal from my XBM80-2 80m micro-transceiver on the on-line SDR at Twente in Holland. The sig...

This evening I worked G6ALB 3kms away on the XBM80-2 60mW ultra-simple 80m transceiver getting a 599 report. Andrew was copied at 599 when ...

Mike Rainey AA1TJ has built his version of the XBM80-2, but LESS the audio stage, using instead his 600 ohm magnetic headphones via a trans...

This morning I worked M0DRK using my tiny 60mW XBM80-2 transceiver I designed last week. It uses just 13 parts plus the crystal, earpiece...