I used the W6PQL input splitter/output combiner to run two KPA500s together.
His combiner is built to handle two 1KW pallets in his big amp design so it
should be perfect for the Mercury. Nicely built and top quality boards.
Ken K6MR
________________________________
From: Amps <amps-bounces@contesting.com> on behalf of jim.thom
jim.thom@telus.net <jim.thom@telus.net>
Sent: Thursday, April 28, 2022 7:55 AM
To: amps@contesting.com <amps@contesting.com>
Subject: [Amps] High Power Combiners
Date: Wed, 27 Apr 2022 16:33:57 +0000 (UTC)
From: Dennis W0JX <w0jx@yahoo.com>
To: Amplifiers <amps@contesting.com>
Subject: [Amps] High Power Combiners
<I wonder if anyone on the list has info on how to build a high power
combiner. I have <a friend that will soon have two Mercury III amps and I
suggested that he might want <to look into combining their output.
<I am aware that ACOM has such a device but it is very expensive? and is
more than <is needed.
<73 Dennis W0JX
You might want to check out the RF SSPA Builders FB page. They have it
down to a fine art. Ask there. Some pretty sharp and talented folk on
there.
Basically you want a broadband low power splitter, with a 50 ohm input and
a 25 ohm output (the 2 x 50 ohm cables in parallel = 25 ohms) that drives
the input of each merc-3.
The broadband high power combiner is 25 ohms in...and 50 ohms out. Same
deal, the 25 ohms on the input side consist of 2 x 50 ohm cables in
parallel.
OM power makes a 3 x way splitter + 3 x way combiner, but it's stupid
priced...rated for 10 kw.... and uses a 7-16 on the output of the
combiner.
2 x Merc-3's and a splitter / combiner is an expensive 3db, but it is
doable.
The german B26 amp will do 1.5 kw on data modes, and comes with a built in
auto tuner + pin diode QSK....aprx $5K. That would be cheaper than 2 x
merc 3's + a splitter / combiner. And you still would not have a 2 kw
rated auto tuner, nor QSK.
Jim VE7RF
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