[time-nuts] 75Z vs 50Z for GPS receivers (was Re: ACE-III GPSreceivers (Dr Bruce Griffiths))
Mike Suhar
msuhar at woh.rr.com
Sun Jan 28 08:33:56 EST 2007
RG62 was also used for the interconnection between the Heathkit SB303
receiver and SB401 transmitter. I thought that was a strange choice of
cables but at the time there were miles of the stuff being used for IBM 3270
terminals as noted below.
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Sunday, January 28, 2007 6:20 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 75Z vs 50Z for GPS receivers (was Re: ACE-III
GPSreceivers (Dr Bruce Griffiths))
In message <45BC85F5.8010708 at xtra.co.nz>, Dr Bruce Griffiths writes:
>93 ohm RG62 cables with BNC connectors are not unknown, they were used
>in some nuclear instrumentation.
>I have a few of these lying around.
Other uses:
93 Ohm: IBM 3270 terminal cabling
75 Ohm: Practically all telecoms
50 Ohm: Thin ethernet.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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