[Amps] Future of RF AMPS

[John E Cleeve]

Hello Don,

I have been following the interesting thread. I tried to use the 
Communications-Concept link, but there is something wrong, my brower 
does not like it. I then tried a direct route via Google and once I made 
contact with Communications-Concept, the browser, Internet Explorer 
stopped working again. Perhaps some one else might try the link.....I 
would really like to see the products on offer.

73, John G3JVC/GM3JVC.



On 11.09.2013 20:45, 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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>> > >
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