[R-390] Digging around at work

[Tracy Fort]

Mike,
 I had no real clue what their exact application was. When I found the
terminators, I was surprised. I was informed, that they are used in =
Digital
Comm on an Aircraft believe it or not. They are the very nice silver =
plated
looking connectors. They seem to be very high quality. At least I now =
have a
source for 390 connectors.

Tracy

-----Original Message-----
From: r-390-bounces at mailman.qth.net =
[mailto:r-390-bounces at mailman.qth.net]
On Behalf Of mikea
Sent: Friday, July 27, 2007 3:52 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Digging around at work


On Fri, Jul 27, 2007 at 03:36:38PM -0400, Tracy Fort wrote:
>=20
>=20
>  I was digging around at work last night and came across an unusual=20
> connector. It's not unusual in the fact that it is a UG-421B/U=20
> connector. It does fit on the Balanced 390 connector properly. I'm=20
> sure most of you know that. What's unusual is that this particular=20
> connector is used as a bus terminator on the Digital audio bus in some =

> equipment that we maintain. It looks as though I can remove the rear=20
> of the connector and extract the pins which have a 128 ohm resistor=20
> soldered between them. I'm think that I can make a short adapter to=20
> hook up to a BNC cable or such. I might be able to get a few more of=20
> these things too. I'll let you know.

The balanced twinax connectors are used on IBM AS/400 (and, IIRC, on=20
IBM System/36 and System/38) minicomputers, as network connectors.=20
They're easy to find here in the Oklahoma City area.=20

I never heard of them being used in any audio gear at all; they seem=20
awfully bulky for modern gear.=20

--=20
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin=20
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