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Jon_G4MDC · 5th Aug 2021, 7:50 am

CTCSS is on page 55. It is serially loaded though the data is changed to parallel for presentation to the CTCSS IC itself.
I have used simple opamp circuits for CTCSS generation. They were tunable and perfectly serviceable.

5th Aug 2021, 7:50 am	#7
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Kenwood TM421E Sick CTCSS is on page 55. It is serially loaded though the data is changed to parallel for presentation to the CTCSS IC itself. I have used simple opamp circuits for CTCSS generation. They were tunable and perfectly serviceable.