[time-nuts] GR Connectors
Kmec at aol.com
Kmec at aol.com
Sun May 28 11:59:39 EDT 2017
GR made several coaxial connector series: the obvious 874, the 8.5 GHz
very low residual VSWR GR-900 (IIRC 14 mm bore) and the GPC-7 (7 mm bore) 18
GHz precision connector, a very rare precursor to the APC-7 with a 1/4 turn
locking collar, only place I saw it was in the HP 1965 catalog, brief
lifetime. I have a few in my collection of MW history stuff.
GR was the cats meow for a long time. I have a pile of the 900 & 874
stuff, just because I like it. The AIL hot/cold load that uses 900 is still
worthwhile. I guess they can bury all this stuff with me, like King Tuts
tomb...
73
Jeff Kruth
WA3ZKR
In a message dated 5/28/2017 5:53:31 A.M. Eastern Daylight Time,
time-nuts-request at febo.com writes:
Message: 17
Date: Sun, 28 May 2017 05:15:52 -0400
From: Scott McGrath <scmcgrath at gmail.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] Two pieces of old General Radio Freq. Nuts
Message-ID: <DAD89E1A-2704-4E79-9C02-CF331598A71F at gmail.com>
Content-Type: text/plain; charset=utf-8
The GenRad 874 connector was good to 4.5 Ghz and took a Banana plug in
the center conductor without changing electrical characteristics!!!
http://www.ietlabs.com/pdf/GR_Experimenters/1948/GenRad_Experimenter_Oct_194
8.pdf
Not bad for a connector designed in 1948!
It was largely supplanted by the APC-7 connector from Bunker-Ramo which
was also a hermaphrodite design but had a 18 Ghz frequency limit
Lots of Tek calibrators used this connector due to its good impedance
matching without requiring obsessive connector maintenance as the APC-7 does
(cleaning, gauging and finger replacement)
More information about the time-nuts
mailing list