[time-nuts] Symmetricom 58534A-H01, NOS surplus (eBay)
phk at phk.freebsd.dk
Tue Oct 13 13:36:18 EDT 2015
In message <A00FD6E6-7250-4B28-90EF-F0EA7C0DF6BB at icloud.com>, Gregory Beat writ
>Surplus Ericsson GPS Timing Antennas (58534A), new in box,
>to convert the RS-422 to RS-232 and provide a 1 pps output.
I've used Synergy GPS's version for some NTP servers and there is
one little detail they don't mention too much: The RS422 circuitry
has a significant tempco.
The PPS signal moves more than a microsecond as a result of this
in danish weather, in particular in clear winter weather.
Other than that, it's a quite convenient way to get GPS on a
roof, since you can use anything from phone-wiring to CAT7
for the cable.
Do think about lightning protection, if nothing else, tie a
knot in the cable right outside the hole into the building.
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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