[R-390] Balanced Antenna Connector

[Larry Haney]

Hi Barry,  The connector in your picture is the old original twinax
connector.  Somebody modified your 390 and changed the new twinax to it.
It was used on the early sp-600s.  The male plug is available online and is
known by the name ug-102, pl-284, Amphenol 83-22sp and 83-821.  Sorry I
don't have any at the moment.

Regards, Larry

On Wed, Oct 9, 2024 at 2:00 PM Barry Scott <72volkswagon at gmail.com> wrote:

> Hi Larry,
>
> Those are the standard twin-ax connectors ("IBM"?).  I have one of
> those but this connector is different.  See the pictures below.  Those
> sockets appear to take a pin that's about 0.090" in diameter.  I just
> don't recognize it.
>
> Thanks,
> Barry - N4BUQ
>
> On Wed, Oct 9, 2024 at 3:04 PM Larry Haney <larry41gm2 at gmail.com> wrote:
> >
> > Hi Barry,  There are many manufacturers making the twinax male straight
> plug today for the balanced jack on the 390s.  There's Pasternack PE4104,
> PE-S330; ARC - 8-299, AMPHENOL - 82-5589-RFX, 162100; SPC Technology /
> SAMAR - SPC21084; Connex 162100; Pan Pacific TWX-3501; Aim Cambridge
> 27-9087, AIM 27-9080; AVA 403000 and others.
> >
> > If anyone would like one, I'll sell them an AVA 403000 for $3 + postage.
> >
> > Regards, Larry
> >
> > On Wed, Oct 9, 2024 at 11:21 AM 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
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