UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Chinese 1A2 Super Regenerative FM radio kit

VT FUSE · 4th Nov 2017, 8:56 pm

Well,I don't see an obvious feedback path in the circuit therefore it is a straight TRF receiver to my eyes.

I still have some valve RC receivers as well and can still visualise circuits in the FC Judd "radio control for model aircraft and boats" book from 1950's.

I have seen many 27 MHz receivers utilising "hard" pentodes and "soft" thyratrons in articles inc those referred too as well.

The device under discussion uses the heptode valve strapped as a pentode,this is entirely feasible,however I have no conviction that it can operate at 88MHz let alone 108MHz.

Guess the only conclusive answer is for an electronics engineer to buy the kit and then subject it to real life signal strength levels that would be expected from the expected short aerial but employing a signal generator and seeing what comes out of the kit.

4th Nov 2017, 8:56 pm	#36
VT FUSE Hexode Join Date: Aug 2010 Location: Malvern, Worcestershire, UK. Posts: 344	Re: Chinese 1A2 Super Regenerative FM radio kit Well,I don't see an obvious feedback path in the circuit therefore it is a straight TRF receiver to my eyes. I still have some valve RC receivers as well and can still visualise circuits in the FC Judd "radio control for model aircraft and boats" book from 1950's. I have seen many 27 MHz receivers utilising "hard" pentodes and "soft" thyratrons in articles inc those referred too as well. The device under discussion uses the heptode valve strapped as a pentode,this is entirely feasible,however I have no conviction that it can operate at 88MHz let alone 108MHz. Guess the only conclusive answer is for an electronics engineer to buy the kit and then subject it to real life signal strength levels that would be expected from the expected short aerial but employing a signal generator and seeing what comes out of the kit.