Bill,
1. A suitable power transformer for 50 VDC 50 A output.
2. The output filtering and matching network for all HF band operation.
48v @ 50A SMPS's are off the shelf these days. I really don't know why
manufacturers still carry on with toroidal's even if they are a few
bucks less expensive.
Heck, even the 100% duty cycle broadcast transmitter and PA producers
use switchers these days at way more power than we'll ever play with.
There's enough stock 160 through 10m LPF designs out there on the web.
Just upgrade the current handling!
--
Philip de Cadenet G4ZOW
Transmitters 'R' Us
http://www.transmittersrus.com
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