We had a discussion about the use of the ARR-1 with the ARB back in February, Dave. The ARB doesn't require the pilot's control box. Perhaps that was what you were recalling. KK5F gave a comprehensive treatment of the installations, closing with, "The full ZB-* installation with adapter, antenna relay, and control box is necessary only for RU-* receivers CBY/CW-46051* or CBY-46064 in the later RU/GF command sets. Such systems have several dual-band coil sets with one band for the desired communications frequencies such as 3000 to 4525 kHz, and the other band 540 to 830 kHz for reception of precisely the range of modulation frequencies used by ZB homing system YE or YG transmitters."

The ARR-1 manual I posted at https://aafradio.org/docs/ZB-3&ARR-1.pdf covers the RU installation fairly well - the last page shows all the piece parts needed. I'm not sure the two position configuration figures into the homing function. The pilot would have had complete responsibility for getting back to the carrier in either single seat or dual seat aircraft, and when in the homing freq mode I don't think you wouldn't want the back seater to be doing much.

- Mike KC4TOS

On 8/6/2022 4:21 PM, David Stinson wrote:

Who is it here that is the best versed on the
R-1/ARR-1 when installed with the GF/RU?
Mike F.? I am being asked about it and
I can't recall. I'm lucky to remember to
breathe these days. I don't want to
tell something that turns out to be wrong.

"I’m putting together a GF-11/RU-16 2 position configuration radio for the Military Aviation Museum in Virginia Beach, Virginia equipped with an R-1/ARR-1 Homing adapter. There is some confusion as to whether I need the Homing Adapter switch box with this set up. Any help would be appreciated."

I know there are installations which do and do not
use it.

Thanks,
Dave S.