[Milsurplus] Whoosh, what a find...!

Wed, 27 Nov 2002 13:17:25 -0500

Hi,

At least according to the guy who designed it the Harris power supply for
the 110 is a bit unusual. It drops back on the high voltage as the current
output goes up to protect the tube. It's something to do with the size of
the choke and capacitors in the filter.

You wouldn't think that a pair of  4CX1500 would need protection but
according to the original specification they do. There is a paragraph in
there about running for something like 30 minutes key down with no air to
the unit and the poor thing mis-tuned. I may not have the paragraph quite
right (30 years of to much beer ...) but that's more or less what why.

    Take Care!

        Bob Camp
        KB8TQ

----- Original Message -----
From: "Bruce Lane" <[email protected]>
To: <[email protected]>
Sent: Tuesday, November 26, 2002 10:28 PM
Subject: [Milsurplus] Whoosh, what a find...!

> I've often been accused by friends of mine of having the darndest luck
when scrounging for surplus goodies. I received some rather substantial
proof of that luck today when I located, of all things, a Harris RF-110A
linear amp and its matching RF-112A power supply at -- of all places! --
Boeing Surplus Sales here in Kent.
>
> The unit was nearly immaculate, physically speaking, done up in nice Navy
gray, and it even had its power and interconnecting cable with it. I expect
to be able to at least borrow a manual for it tomorrow. In case I can't,
does anyone know if LOGSA or a similar agency has a .PDF available to
download? Or what the military equivalent number of this monster is?
>
> My price was a stunning total of $265.00. Unless I'm seriously mistaken, I
would have trouble finding one of the output tubes (Eimac 4CX1500B's) for
that.
>
> As you might imagine, I'm counting my blessings. ;-) My next task will be
to either (1); Find a matching Harris receiver/exciter to go with it, or
(2); Figure a way to interface its auto-tuning capability to a Sunair
GSB-900DX, and to tap off the Sunair's RF output so that I'm getting the
requisite 100 or so milliwatts required by the amp.
>
> And that frelling power supply is HEAVY, but just in one corner! I've not
opened it up yet, but I'm assuming the HV transformer is what's adding all
the weight. I think I'll build a custom roller-base for it out of 2x4's and
some good casters.
>
> Keep the peace(es).
>
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Bruce Lane, Owner & Head Hardware Heavy,
> Blue Feather Technologies -- http://www.bluefeathertech.com
> ARS KC7GR (Formerly WD6EOS) since 12-77 -- [email protected]
> "I'll get a life when someone demonstrates that it would be superior
> to what I have now..." (Taki Kogoma, aka Gym Z. Quirk)
>
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