Well, read http://www.communication-concepts.com/appnotes/AN758300Sharp.pdf
pages 10 and 11 for yourself. If one amp fails, the load resistance
changes...
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: "Steve Thompson" <g8gsq@qsl.net>
To: <amps@contesting.com>
Sent: Monday, July 14, 2003 10:56 AM
Subject: Re: [Amps] Revisited: Power Combiners, cheap amps.
> On Monday 14 July 2003 06:23, Dr. William J. Schmidt, II wrote:
> > 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.
>
> I wouldn't go without the resistors - they aren't there to control the
VSWR
> that the amps see, they are there to provide isolation between the amps.
> Without resistors, you can have the makings of a very destructive
oscillator
> and their cost in relation to the whole project.
>
> Steve
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
|