wythall radio club

having fun with RF

A story of how a Club Project led to “other things!”

April 11, 2013 By: Chris G7DDN Category: Club, Fun, News

Enthused by Wythall Radio Cub’s recent club project here, member Colin M0GJM decided to go hunting for a circuit for a valve based TRF receiver to cover the medium wave band. Having found one and played with it for a while, Colin shared his discoveries with another member, Ian M0IDR, who was equally fired by the thought of building something with a thermionic device.


Ian has now gone on to make his own version of the receiver, making changes to the circuit “on the hoof”. The finished product (pictured) uses a 12BH7A double triode valve from a defunct American TV and a rather nice tuning capacitor which was rescued from an old Decca transistor radio that someone had relegated to the compost heap! Apparently it did need a little cleaning up…

What a fantastic example of life in a busy Amateur Radio Club! Enthused by a club project from one member, others go searching for more circuits and end up bringing into life the little beauty pictured here.

Watch out for our next Club Newsletter where an article with fuller description and more photos will be published and its brother from the workbench of Colin M0GJM will be published too.

Home construction lives on at Wythall Radio Club!