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Old 8th Aug 2022, 8:35 pm   #10
murphyv310
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Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,088
Default Re: Band 1 Rod Pentode modulator (Part 2)

Hi.
The project is virtually completed, I've ordered a suitable project box which will house the modulator and power supplies. I've confirmed that I can run this on my 12v solar system with regulated filament supply and video bias, HT is from a small inverter regulated at 80v, max available current is 3ma which is sufficient, there is no noticeable interference from the supplies as they are well filtered. Total current draw from 12v is just below 60ma so quite good. I would say that the modulator wouldn't see a lot of use TBH. The case will have BNC video in, Phono audio in and an "F" connector for RF out. Two controls on the front would be power and Video level, bias is a preset and shouldn't need further adjustment after setting. The RF will be fed to a passive Splitter, which will also be fed from the channel 11 modulator and then to the distribution amp that feeds 9 outputs.
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Trevor.
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