UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Does anyone know anything about "Modulation Depth"? (Philips PM5680)

FERNSEH · 7th Oct 2022, 12:46 pm

Inexeon wrote:
"I think I understand with the vision carrier, it's the ratio between the amplitude of the carrier tone and the video signal and I can see this clearly on my spectrum analyser. Some reading suggests 90% "modulation depth" is a good starting point."
Is 90 per cent video modulation depth too much even for negative modulation TV systems?

DFWB.

7th Oct 2022, 12:46 pm	#11
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Does anyone know anything about "Modulation Depth"? (Philips PM5680) Inexeon wrote: "I think I understand with the vision carrier, it's the ratio between the amplitude of the carrier tone and the video signal and I can see this clearly on my spectrum analyser. Some reading suggests 90% "modulation depth" is a good starting point." Is 90 per cent video modulation depth too much even for negative modulation TV systems? DFWB.