What you suggest works fine... as long as the amps remain in phase (e.g.
make sure the input and output coax lines from the splitter and to the
combiner are same length). Don't bother with the resistors on the
combiner... being tube amps, SWR on the working amp when the other fails is
tolerable for a short period (whereas transistor amps would go south almost
immediately). CCI's combiners are a little under-rated... meaning they are
a little small for CCS power. I've used several of them on transistor
projects with great results up to about 4 kW.
Sincerely,
Dr. William J. Schmidt, II K9HZ
"Collector of Edison Wind-up Phonographs... Do you have one for me?"
Email: bill@wjschmidt.com
Alternate Email: wmschmidt@charter.net
WebPage: www.wjschmidt.com
----- Original Message -----
From: "Brian Moran" <brianmo@yahoo.com>
To: <amps@contesting.com>
Sent: Thursday, July 10, 2003 3:09 PM
Subject: [Amps] Revisited: Power Combiners, cheap amps.
> I perused the ~19 meg archive for "power combiners" --
> from my read, the suggestions were mixed for trying to
> sum the outputs of two HF amps. Has anyone tried the
> following?:
>
> Take two relatively-inexpensive amplifiers, say,
> heathkit sb-220's. Make sure that they both work
> reasonably well. With the hybrid combiner available
> from CCI (make sure to use those resistors in case of
> failure of one amp!), combine their outputs.
>
> Again, WITHOUT having done this, it seems to me that:
>
> With SB-220's at about $0.57 a watt (700 watts) or so
> OUT (CW), $~400 recent prices used (conservatively))
> they are seemingly inexpensive...
>
> Tuning would have to be done individually, then the
> amps switched into the network.
>
> Has anyone tried this?
> Brian, N9ADG
>
>
>
>
> __________________________________
> Do you Yahoo!?
> SBC Yahoo! DSL - Now only $29.95 per month!
> http://sbc.yahoo.com
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
|