[R-390] Balanced Antenna Connector

[Barry Scott]

Larry,

Thanks so much for the picture.  As I mentioned, I just wasn't sure
how the connections were made on the inside of the very front section.
It makes sense to me now.

Thanks again,
Barry - N4BUQ

On Fri, Oct 11, 2024 at 1:37 PM Larry Haney <larry41gm2 at gmail.com> wrote:
>
> Hi Barry,  Attached is a pic showing the 3 sections to the connector.  The coax center conductor would be stripped about 3/4" and inserted into 1 of the 2 pins on the left section and soldered on the end.  The coax shield connects to the center section and to the other pin in the left section.
>
> Regards, Larry
>
> On Fri, Oct 11, 2024 at 9:30 AM Barry Scott <72volkswagon at gmail.com> wrote:
>>
>> Regarding those connectors (ug-102, pl-284, Amphenol 83-22sp and
>> 83-821), I'm not finding a picture or drawing of those that shows how
>> the cable connects to the pins.  A picture of the inside (back) of the
>> part of the connector where the pins project from the front would be
>> helpful but a description might work as well.  I'd like to make sure
>> how these are connected to the cable before ordering one.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>> On Thu, Oct 10, 2024 at 1:53 AM Larry Haney <larry41gm2 at gmail.com> wrote:
>> >
>> > 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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