Carl, Bob and others, depending on your definition of QRO, there are several
options for power today:
1> the hot project currently is a single water cooled GS15B, good for 10W
drive to about 400w output, designed by KD5FZX and in use by many ops and
documented at www.nd2x.net. Makes a great driver for #5 and 6 below. The tubes
cost less than $25 and apparently there are thousands available.
2> Pairs of 7289 water cooled, good for about 250w out, documented in
several ARRL books. We are beginning to run out of cheap tubes and the GS15B is
a
much better choice today.
3> GS23B, water cooled, coaxial cavity, good for close to 1500w out, design
by KD5FZX, documented at _www.nd2x.net._ (http://www.nd2x.net.)
4>YL1050, air cooled, good for 1200-1400w, documented in Dubus.
5>TH347 coaxial cavity amp by DL9EBA? available through DF6NA, air cooled,
good for about 2000W. Shows up from time to time for sale by current owners.
6>TH347 square radial cavity by K5GW, not documented but info available, air
cooled, good for 3KW+.
7> solid state amps good for about 500W made in Germany, can be found on
internet.
With a 12ft dish, on 1296MHz, you can work every known eme cw station and
many more JT65 stations all over the world. With the circular polarity feeds
now
in use, the band is a real joy to operate!
You may have heard about the portable (on a 16ft farm trailer) operation by
WA5WCP last summer in CT, RI, VT and MA. He worked all over the world with a
10ft TVRO dish and 300W. The operation was organized because no one is on 1296
eme in these states.
73,
Gerald K5GW
In a message dated 5/26/2007 8:01:55 A.M. Central Daylight Time,
km1h@jeremy.mv.com writes:
Id love to have something like that to play with Bob. After the Svetlana
4CX1600A fiasco I dont have many choices to get QRO on 1296.
Never tried EME but with my hilltop location and a negative horizon Im
probably well situated for those type of shots. Just never had the interest
I guess; I even have an old 12' TVRO dish out back that I used before
scrambling..
Carl
KM1H
----- Original Message -----
From: "Robert Bonner" <rbonner@qro.com>
To: "'jeremy-ca'" <km1h@jeremy.mv.com>; "'Steve Thompson'"
<g8gsq@eltac.co.uk>; <amps@contesting.com>
Sent: Friday, May 25, 2007 9:01 PM
Subject: RE: [Amps] FW: attaching a heat spreader to a heat sink
> Carl,
>
> I have a pair of Y-739F's
>
> They are Planar triodes with 600 Watts of plate dissipation. Basically
> giant 3cx100's or 3c39's They are used in aircraft pulse applications.
>
> I was thinking, they would sure look nice side by side in a 1500Watt
> output
> 1296 EME Cavity amp.
>
> I tried to get Marc Thorsen interested in helping me with the cavity, but
> he's not lighting up for the project.
>
> BOB DD
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of jeremy-ca
> Sent: Friday, May 25, 2007 8:29 AM
> To: Steve Thompson; amps@contesting.com
> Subject: Re: [Amps] FW: attaching a heat spreader to a heat sink
>
> Ive thought about that with my 1296 and 2304 amps using a pair of water
> cooled 3CX100A7's, but since I quit drinkin' about 7 years ago its become
> moot.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Steve Thompson" <g8gsq@eltac.co.uk>
> To: <amps@contesting.com>
> Sent: Friday, May 25, 2007 2:14 AM
> Subject: Re: [Amps] FW: attaching a heat spreader to a heat sink
>
>
>> Robert Bonner wrote:
>>> WOW, Water cooling. On a 4 MRF-154 amp you would have the Mister
>>> Coffee
>>> Attachment.
>> Helps keep you going on those long contest sessions. My thoughts were
>> moving towards adding a condenser system and turning it into a small
>> still.
>>
>> Steve
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
> _______________________________________________
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>
>
>
>
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