[Milsurplus] USN: ARB receiver used with GP-7 transmitter?

[Mike Morrow]

I have seen a number of pictures of WWII MF/HF GP-7 transmitters installed
with some model of the RU as the associated receiver.  I suppose the RAX was
another likely candidate too, but I don't think I've seen any photos of
that.

Once the ARB was deployed, that seems to me to have been a much better and
more compact receiver for a GP-7.  But, I've never seen any photos or other
documentation showing that the GP-7 and ARB combo was ever actually used
together in USN aircraft.

Has any one on the list come across anything that would show an instance of
the GP-7 being used with a ARB, or conversely, could speculate on why such a
combo would not have been used?

Thanks and 73,
Mike / KK5F