UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Improving Selectivity In Vintage Receivers

G6Tanuki · 26th Oct 2022, 11:57 am

The up/down converter is an intriguing idea. There was someone on EBay a while back selling modules containing 9MHz KVG filters at a good price. They were the things we all aspired to back a few decades.
Add an xtal oscillator to provide carrier for the up/down conversion and a pair of balanced mixers...

Then you can go on to add a product detector and a stabiliser for the LO HT to stop the effect where altering the RF gain alters the tuning..

26th Oct 2022, 11:57 am	#4
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 13,995	Re: Improving Selectivity In Vintage Receivers The up/down converter is an intriguing idea. There was someone on EBay a while back selling modules containing 9MHz KVG filters at a good price. They were the things we all aspired to back a few decades. Add an xtal oscillator to provide carrier for the up/down conversion and a pair of balanced mixers... Then you can go on to add a product detector and a stabiliser for the LO HT to stop the effect where altering the RF gain alters the tuning.. __________________ I'm the Operator of my Pocket Calculator. -Kraftwerk.