Jack's insights are excellent, Mark.  In addition, I just added quite a few more pages to the pdf at https://aafradio.org/docs/ARR-1.html (I think you'll have everything you need from that document now).  It's not up to Robert Downs' high quality, but it should be clear enough to use.

On the antenna, it does seem odd that it isn't covered in the manual, but the Services seemed to separate antennas from the radios for odd reasons.  The Navy used a "hockey puck" about three inches in diameter, made out of phenolic having a steel bottom cover with a SO-239 that bolted into a hole in the fuselage with a black rubber gasket under the skin.  It had a 1/4-20 thread in the top, into which you could thread a rod of the proper length for the service.  At the upper end of the ZB-* frequency range it was about a foot long.  Photos of the *AT-5/ARR-1 variant are below.

        73,
 -  Mike  KC4TOS






On 2/13/2022 2:00 PM, Jack Antonio wrote:
First of all. Mike Hanz's website has excerpts from the ZB-3 and AN/ARR-1 manual, which describes the

differences between the ZB-1,-2, -3 and AN/ARR-1.  This should answer your questions as to the control box

and relay box. Robert downs also has a reprint of the ZB-2 manual.The primary purpose of the relay box

is to switch the input of the LF/MF receiver between the antenna and the output of the homing adapter.

It was always my understanding that the ARB was designed to support the homing function, making

the control box and relay box unneccesary for the ARB.  But, that leaves out the LOCAL/DISTANCE function

as well as basic ON/OFF of the adapter.  The ARB has an internal relay to select beween the homing

(L1 and L2) and communication (AT and AF) selected by the bandswitch on the control box.

I set up and displayed an ARB/ATB/ZB setup at Gilbert back in 2013, using the proper test box as a

signal source(with the output padded down to leakage levels as it was still on about 246 Mc). I did

not include either the control box or relay box thinking they were unnecessary. And everything worked.

I have never seen an official document showing the interconnect diagram of the ARB and ZB, and if

there is one, I'd really like to have a copy.

Hope this helps.

Jack Antonio

WA7DIA

On 2/13/2022 11:32 AM, MARK DORNEY via MRCA wrote:
  I’m not sure what a ZB Antenna control box and a ZB Control Box are. I think the ZB Control box is a Pilot’s Control Box CZR-23214. I have no idea what a ZB Antenna control box is. All help is appreciated.