[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  
Jeff Kruth
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!!!


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