[MRCA] UG-565 adapters and the RF-1110

[Anthony Clare]

So, it looks like you will be running about 20 times more power than I will be
running.

I might have to put a really big fan on the Elecraft K2 and run the full 100
watts. 

------ Original Message ------
Received: Wed, 19 Jul 2023 02:19:21 PM EDT
From: Ray Fantini <RAFANTINI at salisbury.edu>
To: "MMRCG at groups.io" <MMRCG at groups.io>, Military Radio Collectors Association
<mrca at mailman.qth.net>, "HarrisRadio at groups.io" <HarrisRadio at groups.io>
Subject: [MRCA] UG-565 adapters and the RF-1110

Ok, found enough connectors and adapter and will work on building up a set of
identical cables to go from the amplifiers to the combiner. Looks like for now
will be doing this with RG-58U but think I am under the limit running 500
watts on each.
Have all four Amplifier panels up and running now and discovered that when
running in idle the amplifier with full complement develops way more heat then
with just two amplifiers.  Harris wants the idle current set to 3.0 amps on
each device to push them well into there linear range and that totals out to
around 48 amps at 50 volts and the full complement of devices chug along at
about 2,400 watts dissipation before you apply any drive!
Each device has its own bias pot that will allow you to set bias anywhere from
just under three amps up to four but not any lower, short of changing the
design of the bias networks looks like that's what you get with the RF-1110B
Don't know if I will have everything up for full power ops by Saturday for the
RTTY net and may default to just running two panels like before, still have to
fabricate the cables, change the output configuration to including the
combiner and last but not least look at spurious and intermod.
Thanks to everyone who offered to help with adapters, cables and things.

Ray F/KA3EKH




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