On 13 Nov 2007 at 19:55, Nils Petter Pedersen wrote about:
And so did KM1H, and K9YC, with many snips:
> The problem with the TO-packaged units is that they MUST have a good
> heatsink.
> > I never heard of them before. I see that Mouser
> > carries the 100W version in stock. Ive just ordered a pair of 100 Ohm from
> > Mouser and will see how they look for RF as well as how they hold up at
> > power in a Heath Cantenna..
I used some Caddock power resistors in the grid circuit of the
"Sunnyvale/Saint Petersburg Kilowatt Plus" that appears in the 1999-
2004 ARRL handbooks. They are mounted on a pretty big heat sink, and
have their own fan. This setup has been very satisfactory, and
capacitance hasn't been a problem.
The amplifier gets serious contest use, and hasn't had any problems.
73,
George T. Daughters, K6GT
See you in the California QSO Party (CQP)
October 6-7, 2007
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|