Roger G3XBM's (Mainly) Amateur Radio Blog

This afternoon I got an email from Michael Rainey AA1TJ .  It sounds like they have just emerged from a long crisis with his partner's h...

Often it is some time before you realise someone is not around. You just realise they are not there. Often there is a simple explanation, bu...

Overnight I had a very good email from Michael AA1TJ. I was so pleased to hear that both Michael and his XYL were well and he is still busy...

Michael Rainey AA1TJ's Facebook page has this photo of a very early Marconi radio station on Cape Cod.  By the First World War it was a...

This afternoon I had a little play with a simple crystal set to see what sort of minimum discernible signal (MDS) was possible. My previous ...

It's time to remind people of the wonderful circuits and ideas at Mike Rainey AA1TJ's site. Always full of amazingly simple designs ...

http://aa1tj.blogspot.com/2010/09/verweile-doch-du-bist-so-schon.html Michael Rainey AA1TJ has an excellent blog in which he covers a ran...

Menos es MAS is another fine QRP transceiver design from Mike Rainey AA1TJ . This really is about as simple as an HF transceiver gets with ...

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...

AA1TJ's historic attempt to span the Atlantic with just a "voice powered" TX (powered only with DC generated by rectifying aud...

Mike Rainey AA1TJ has pushed his DX up to 1329kms on 80m using his Code Talker TX (see left) which uses only the energy derived by shoutin...

Mike Rainey has now added a schematic to his page on the New England Code Talker CW transmitter powered and keyed only by audio derived fr...

Mike Rainey continues his work on purely voice powered transmitters , in which just the energy in his voice is used to power the RF circuits...

Mike has done it again - a superb piece of QRP creativity. This is from his email today: "AA1MY and W1PID met with me on 3686kHz this ...

Mike Rainey AA1TJ has some good tunnel diode ideas on his pages but these devices are hard to find these days. Instead one can create a neg...

Just got an email from Mike Rainey AA1TJ describing his TX powered only by his voice . He achieved a distance of 161kms with a germanium tra...

Take a look at Mike's neat 1 transistor VXO controlled 80m 80mW transceiver, The Reggie , which uses a passive RX with the VXO acting a...

Way back in the 1960s I recall making a simple tunnel diode oscillator as part of a lab project and being excited to see such a circuit use...