UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Kenwood TM322. (Actually a TM-733).

Jon_G4MDC · 28th May 2020, 11:39 am

I would use your SDR to look at the AF spectrum of the CTCSS hum if it allows that functionality. I think it will.

A microprocessor tone could have several harmonics which would make the ear "put back" the fundamental. Compare if you can with the Baofeng.

Maybe more filtering on the CTCSS signal from the control board is needed?

28th May 2020, 11:39 am	#16
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Kenwood TM322. (Actually a TM-733). I would use your SDR to look at the AF spectrum of the CTCSS hum if it allows that functionality. I think it will. A microprocessor tone could have several harmonics which would make the ear "put back" the fundamental. Compare if you can with the Baofeng. Maybe more filtering on the CTCSS signal from the control board is needed?