[R-390] Balanced Antenna Connector

[Barry Scott]

BTW, I thought that an "IBM" twin-ax connector was supposed to fit but
this connector seems different and doesn't match the twin-ax connector
I have.

The two holes have 0.100" IDs and the threads appear to be closer to
an SO-239 but, naturally, it isn't an SO-239 since it has two pin
sockets.

Thanks,
Barry - N4BUQ

On Wed, Oct 9, 2024 at 1:20 PM Barry Scott <72volkswagon at gmail.com> wrote:
>
> What is the correct designation for the two-pin antenna connector
> (balanced) in the R-390/URR (likely the same for the R-390A/URR but I
> want to be specific just in case).
>
> Also, I think Chuck Rippel had a connection contraption that used a
> resistor (or two) so that 50-ohm unbalanced would match just a bit
> better using the balanced connection.  He had a website that depicted
> that but I don't know if that still exists.  Anyone know?
>
> Thanks,
> Barry - N4BUQ