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-requ...@febo.com writes:
Message: 17 Date: Sun, 28 May 2017 05:15:52 -0400 From: Scott McGrath <scmcgr...@gmail.com> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Two pieces of old General Radio Freq. Nuts Message-ID: <dad89e1a-2704-4e79-9c02-cf331598a...@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) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
