UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - FRG-7. Very quiet

Jon_G4MDC · 3rd Sep 2020, 3:54 pm

I think you are right David. The Local DX Switch Attenuator path is different between range A and the other three ranges.

The other thing this has is an LED indicator that shows when you are tuned on a 1MHz band segment.
It seems it is lit when off tune and it goes out when MHz dial is correctly tuned. I wonder whether that behaviour can be observed on this set?

It works by detecting the level of 1st LO mixed with the 1MHz harmonic as observed at the end of the narrow (52.5MHz) filter.

Do these paths through the Local/DX switch meet general agreement?

3rd Sep 2020, 3:54 pm	#15
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: FRG-7. Very quiet I think you are right David. The Local DX Switch Attenuator path is different between range A and the other three ranges. The other thing this has is an LED indicator that shows when you are tuned on a 1MHz band segment. It seems it is lit when off tune and it goes out when MHz dial is correctly tuned. I wonder whether that behaviour can be observed on this set? It works by detecting the level of 1st LO mixed with the 1MHz harmonic as observed at the end of the narrow (52.5MHz) filter. Do these paths through the Local/DX switch meet general agreement? Attached Thumbnails Last edited by Jon_G4MDC; 3rd Sep 2020 at 4:22 pm.