[time-nuts] GR Connectors
Tom Van Baak
tvb at LeapSecond.com
Sun May 28 12:11:06 EDT 2017
> worthwhile. I guess they can bury all this stuff with me, like King Tuts tomb...
Alternative use for your pile of surplus connectors:
http://leapsecond.com/pages/chess/
/tvb
----- Original Message -----
From: "Jeff Kruth via time-nuts" <time-nuts at febo.com>
To: <time-nuts at febo.com>
Sent: Sunday, May 28, 2017 8:59 AM
Subject: Re: [time-nuts] GR Connectors
> 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)
>
>
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