[Amps] Revisited: Power Combiners, cheap amps.

[Steve]

----- Original Message -----
From: Steve Thompson <g8gsq at qsl.net>
To: <amps at contesting.com>
Sent: Monday, July 14, 2003 4:56 PM
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.
...is minimal.

Sorry!

Steve