[MRCA] Univac Aircraft Antenna Coupler

[mstangelo at comcast.net]

Here is a copy of some documentation I found on the Univac Coupler described in my provious post. I decided to send it in a separate mail in case there is an attachment size limit.

Mike N2MS

> On 01/18/2026 12:53 PM EST mstangelo at comcast.net wrote:
> 
>  
> Going through some military stuff on a snowy Sunday and found a couple of aircraft antenna couplers I got surplus years ago. They were designed by ERA and this model was built by Univac. The are an HF Coupler mounted in the vertical stabilizer of a plane such as a KC-135 to tune the probe HF antenna. They were hermetically sealed and basically consist of a rotary inductor and vacuum variable capacitor tuned via a discriminator circuit. 
> 
> I've attached a couple of pictures. The discriminator section has the cover removed. They were last services at Warner Robbins in 1965. I was told they require 28 VDC and 100 AC 400 Hz. The RF connection is made via a C connector (my favorite RF connector)
> 
> I was going to use the components in a tuner but want to get in operational in their original state. Does anyone have any documentation about the tuner or it's controller box?
> 
> Thanks in Advance,
> 
> Mike N2MS
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