Richard,
Communication Concepts sells combiners that should work.
http://www.communication-concepts.com/index.php/splitter-combiners.html
Don
K9AQ
---- Richard Solomon <dickw1ksz@gmail.com> wrote:
> Rumor has it that RF Parts offered a High Power Combiner, but a search of
> that site
> does not show it. There are a few Combiners, but no Data to tell what they
> do.
>
> Anyone have a source for a Combiner that will handle 2X 600 to 800 Watts in
> ??
>
> 73, Dick, W1KSZ
>
>
> On Wed, Sep 11, 2013 at 9:41 AM, <dsolberg@wi.rr.com> wrote:
>
> > While the MOSFETs can output 1200 watts with four in parallel/push-pull,
> > the output transformer ratio will limit the practical output to between 800
> > and 1KW, using a 9:1 with a 50V power supply. The 9:1 optimal output is at
> > 800 watts. Tokyo HyPower uses this design and they rate it for 1KW. I can
> > also get 1KW with my homebrew amp with (4) SD2933's, but prefer to run it
> > closer to 800 watts to improve the IMD.
> >
> > If you really want the full legal limit, you would be better to have two
> > PA modules and a combiner. Otherwise the output transformer design is
> > going to get real complicated. The other option is running higher voltage,
> > which complicates the selection of a power supply. 50 volt computer server
> > switching power supplies are low cost and easy to obtain.
> >
> > I am happy with 800-1KW, but maybe someday I will try the combiner just
> > for the fun of it.
> >
> > Don
> > K9AQ
> > ---- Leigh Turner <invertech@frontierisp.net.au> wrote:
> > >
> > > Larry, the RF power MOSFETS to which I refer here are the VRF2933 devices
> > > from Microsemi. Sometimes one can find surplus and NOS ST Micro SD2933
> > FETS
> > > on eBay at low prices.
> > >
> > > 4 of these rugged 300 Watt rated devices in parallel/push-pull will
> > yield a
> > > saturated output power of well over 1200 Watts. Six will comfortably
> > yield
> > > over the US legal limit.
> > >
> > > 73
> > >
> > > Leigh
> > > VK5KLT
> > >
> > > -----Original Message-----
> > > From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Larry
> > > Sent: Wednesday, 11 September 2013 10:48 AM
> > > To: amps@contesting.com
> > > Subject: Re: [Amps] Future of RF AMPS
> > >
> > > On 10-Sep-13 5:51 PM, Leigh Turner wrote: using a readily available
> > > multiplicity (6 devices in parallel/push-pull) of cheap 50V MOSFETS
> > sourced
> > > from the surplus market.
> > >
> > >
> > > Leigh,
> > >
> > > Exactly which cheap MOSFETS from what surplus market are you speaking of?
> > >
> > > Larry - W7IUV
> > >
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> > >
> > >
> > >
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