Jeff,
Sounds like the units came from a Collins 180L2 antenna tuner used on
aircraft. I have several of the complete tuners but no diagram.
73
Vic, W1TYQ
On Jul 5, 2008, at 10:38 AM, Dan Hearn wrote:
> I have one of the same units. They showed up fairly often in
> surplus sales
> in Dallas. I think they are from Collins Rockwell antenna tuners I
> would
> also like to get a schematic for it.
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-
> bounces@contesting.com]On
> Behalf Of w3kl@w3kl.com
> Sent: Saturday, July 05, 2008 3:21 AM
> To: amps@contesting.com
> Subject: [Amps] Motorized Jennings Vacuum Cap
>
> I have two old motorized Jennings vacuum capacitor units that I need
> schematics for. I don't remember where I picked these up - swap
> meet I
> think.
>
> The units look like they were removed from a tuning system of some
> type -
> not necessarily for radio though. Perhaps a medical device (MRI etc.).
>
> I can send you photos of the units if you like.
>
> The system has a 26.5V DC motor made by Collins. The motor drives a
> speed
> reduction gear system that then drives a pinion gear that moves a
> lever that
> pulls the capacitor plunger in and out. There are two limit
> switches on the
> unit.
>
> The interface to the unit is via DB 25 connectors.
>
> I can sit down and reverse engineer the wiring of the unit but I
> thought I
> would see if someone already has a schematic for it.
>
> I intend to use them to shunt feed my tower on 160.
>
> Thanks for your help.
>
> 73, Jeff
> W3KL
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