[R-390] 390 collins radio adapter ant. input adapter network

[Rasputin Novgorod]

Hi guys:

I recently won a couple of "r390 collins radio adapter
antenna input adapter network" eBay Item number: 140172485081,
for $10 each. They are beautifully made, silver plated; 
must have cost someone a lot of money.

Basically they are a cylinder with the Coaxial Balanced
connector on one end, and an N connector on the other. The center
pin of the N goes thru a capacitor to ~both~ pins of
the coaxial connector. The center pin also goes thru
a 50 ohn resistor to ground. It's not a connector adaptor,
it's some sort of test jig.

1) Anyway, I plan to rewire one of these to be a connector
adaptor; to go from my coax from a random wire, to the 390a
balanced antenna input. Looking at the 390 from the back,
I seem to remember that the N connector's center pin should go
to the Coaxial left pin, and the right coaxial pin goes
to the connector shell (ground). The 50 ohm resistor will
be removed. Should I remove the capacitor, or leave it in
as a DC block? Have I got it right?

2) What was this part originally used to test for? Is there
any reason to keep my second adaptor original so I can do 
this test? If so how is the test done?

Sincerely
/b




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