John,
I don't know what to tell you. I just tried the URL with Internet Explorer and
I didn't have any problems.
Don
---- John E Cleeve <g3jvc@jcleeve.idps.co.uk> wrote:
> 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@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@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
> >> > >
> >> > > _______________________________________________
> >> > > Amps mailing list
> >> > > Amps@contesting.com
> >> > > http://lists.contesting.com/mailman/listinfo/amps
> >> > >
> >> > >
> >> > >
> >> > > _______________________________________________
> >> > > Amps mailing list
> >> > > Amps@contesting.com
> >> > > http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >> > _______________________________________________
> >> > Amps mailing list
> >> > Amps@contesting.com
> >> > http://lists.contesting.com/mailman/listinfo/amps
> >> >
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|