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Jon_G4MDC · 23rd Jan 2023, 10:40 pm

I looked again at the MX293 AM modulator. I can see no diode detector at the end of the TX chain.

Unlike the M201 and T401/4001 arrangement I suppose they abandoned envelope detection for feedback of a modulation error component. It might only be worth a few % of mod depth, which in a Base could be valuable, in a mobile much less so.

23rd Jan 2023, 10:40 pm	#18
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Pye T4001 AM TX Modulator I looked again at the MX293 AM modulator. I can see no diode detector at the end of the TX chain. Unlike the M201 and T401/4001 arrangement I suppose they abandoned envelope detection for feedback of a modulation error component. It might only be worth a few % of mod depth, which in a Base could be valuable, in a mobile much less so.