View Single Post
Old 22nd Jul 2021, 10:20 pm   #25
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,801
Default Re: HT for a car radio

Quote:
Originally Posted by David Simpson View Post
Probably will experience the same RFI as others have.
The HF generation and harmonics is implicit in how switch mode things work. The difference between the good guys and the bad is in whether it gets let out or not.

You never get all the isolation you'd like in one move, so you have to think like an onion and use several layers, impeding the muck a fair bit as it tries to pass each layer.

Good layout keeps down the size of loops of circulating AC currents, and shepherds currents where you want them to go while nulling the amount going where you don't want it to.

Then comes a box with feed through capacitors etc.... add ferrite rings to season to taste.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is offline