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

Jon_G4MDC · 20th Jan 2023, 11:32 am

I think that might be a fair way to start. The emitter and collector positions might be good places to try adding single ceramic resonators if that's what you have.

If you have 3 or 4 terminal filters then they would probably be better in series with (or in the place of) the IF gain control. I suspect you will need a terminating resistor though and watch to block any DC in both these scenarios!

Sorry still no results for Murata SSB filters. You know who's law says I have lost it...grr.

20th Jan 2023, 11:32 am	#121
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Improving Selectivity In Vintage Receivers I think that might be a fair way to start. The emitter and collector positions might be good places to try adding single ceramic resonators if that's what you have. If you have 3 or 4 terminal filters then they would probably be better in series with (or in the place of) the IF gain control. I suspect you will need a terminating resistor though and watch to block any DC in both these scenarios! Sorry still no results for Murata SSB filters. You know who's law says I have lost it...grr. Last edited by Jon_G4MDC; 20th Jan 2023 at 11:44 am.