[Amps] Future of RF AMPS

[dsolberg at wi.rr.com]

They don't make these combiners they buy them RF Power Systems http://www.rfpowersystems.com/index.php?option=com_content&view=article&id=80

They make custom transformers and combiners, so I am sure they could make a 2 port combiner with a bigger core and larger wire to handle the extra power.

Don
K9AQ
---- "Joe Subich wrote: 
> 
> None of the Communications Concepts two amplifier combiners are rated
> at 2 KW.  They show 4 amplifier (4 port) devices for 2 and 5 KW but
> the only high power 2 port combiner is rated for only 1 KW.
> 
> While it might be possible to modify one of the 4 port sets for 2 port
> operation, there are no application notes on the site concerning the
> splitter/combiner products.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 9/11/2013 3:45 PM, dsolberg at wi.rr.com wrote:
> > Richard,
> >
> > Communication Concepts sells combiners that should work. http://www.communication-concepts.com/index.php/splitter-combiners.html
> >
> > Don
> > K9AQ
> > ---- Richard Solomon <dickw1ksz at 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 at 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 at 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 at contesting.com] On Behalf Of Larry
> >>>> Sent: Wednesday, 11 September 2013 10:48 AM
> >>>> To: amps at 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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