Roger G3XBM's (Mainly) Amateur Radio Blog

As far as I can tell this ultra-simple transceiver has a passive receiver. It was designed initially by PY2OHH and this version appeared i...

 It is always good to see others trying their hand at my designs. DX Explorer has a video of him breadboarding my 2 transistor 80m transceiv...

There’s a wide choice these days in QRP radios unlike years ago . I expect this is, in part, due to the popularity of SOTA and POTA activati...

This photo was taken many years ago in my mother’s garden. Also, judging by what hair I have, which was still black, I would guess this in t...

My attention was brought to this design yesterday.  My immediate thoughts were than the TX would be fine, but the RX very deaf. For local QS...

I think this file is now shared. If you have problems getting it, please discuss with me. I created it in (free)  Open Office  and saved it ...

In my emails today was the Elecraft Newsletter.  One of the articles was about "extreme QRP". This looks interesting I thought, on...

It is hard to think this is 10 years old! It seems like only yesterday. Maybe you can get some ideas from it. It was called the "Lesser...

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 ...

Next year, assuming I am still around (!), I should have some new QRP challenges. I hope to be active on 23cm and on 4m. Both are quite diff...

In our hobby we all have different interests, and that is only right: it would be a sad world if we were all the same. Some like ATV, others...

Nothing compares with working hundreds or thousands of miles on an ultra-simple QRP transceiver that you made yourself.  The challenge is of...

This photo shows me operating from the car some years ago (2012?). From this location on the coast in Devon I have worked the USA with 10m Q...

At the moment I am on 10m WSPR TX with 500mW. So far just local spots from G4KPX (14km). UPDATE 1143z :  Still just spots from G4KPX . UPDAT...

My best ever QSO was probably in 2007 when I had a 1W CW QSO on 6m (50MHz) with a station in the USA by E layer propagation. It was a very g...

This is the radio that preceded the IC-705. I sold mine many years ago to a friend in Cambridge and regret it. If you are after a basic HF/6...

Many of us enjoy the challenge of getting the most from the least. Some define this as the fewest number of parts or the lowest cost. What d...

This appeared as a Facebook memory for today. It was 9 years ago. 

As the 10m antenna was free, I put my W5OLF stand-alone WSPR beacon on using 500mW. So far, just a local spot from G4KPX (14km).

At the moment I am on 10m WSPR TX using 500mW from my stand-alone W5OLF 10m WSPR beacon. So far,  (at 0930z) 3 spots only from local G4KPX ...