I still believe "there is a pony out there" .....small handful of parts and a good dual relay switched LPF board.
73 Kees K5BCQ?
Isn't the rest of that is "I can smell it...."
Yes ferrite and a few more caps in the right places plus some top pour of copper
with stitching to tie it all down so ground (there is no such thing) has less
transverse current paths and lower surface resistance.??
Why say that...? Adding parallel caps is useless if the ground it goes to has
RF resistance (or inductance).? The DC lines start right next to the power amp
so ferrite and caps liberally spread about limits the distribution.? At one point the?
R18, R28, R38, and R48 were tried at 330 ohms with 9.6V Zener at each
corresponding cap to ground was added.? That stuffed the spurs (not the
primary ones) down by 6DB.? ?So yes there undesired RF on the switched
DC.
Allison
