[Milsurplus] ?? " ZA Impedance Adapter "

[Hue Miller]

Type  CDE-30598A
A Unit of Model ZA Aircraft Radio equipment
1940

This has  2 look like ?type RF jacks and 1 phone jack and one
unoccupied hole - another phone jack was removed?

What does this do? Is it only a part of ZA and not ARR-1?
I do have, and am going to keep to clamp on top an ARB receiver,
the ARR-1 homing adapter w/ control box. If this ZA item was not
used w/ ARR-1, i won't keep it.

Odd, what one finds sometimes. A visit to an antique shop turned
up a manual for an SCR-504 "suitcase direction finder", as new,
for $16. Try to find that manual anywhere!
Regards, Hue Miller