[time-nuts] Re: PCTEL Timing Antenna with integrated GPS Receiver?

[Mike Ingle]

Hi, in reading between the lines, are you saying that in practice, the
tempco of twisted pair is worse than the tempco of coax?  Wouldn't any
install where that was critical include a loopback to calibrate out cable
delay?

On Sun, May 9, 2021 at 8:27 AM Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> --------
> Douglas Baker writes:
>
> > I am trying to figure what the advantage is for an antenna with the
> > built-in GPS receiver is.
>
> On reason is that the running the twisted pairs through standard
> preinstalled lightning protection barriers is trivial, whereas
> certifying and finding space for a suitable lightning barrier
> for coax is a lot of work.
>
> Another advantage is that you can reuse existing cabling in rented
> buildings, instead of paying sometimes unbeliveable amounts to run
> your coax to the roof.
>
> (One of the main reasons Telecome Cesiums are still a thing, is that
> they often are much cheaper than renting space for a GPS antenna
> on the roof and cabled down to your kit in the basement.)
>
> However, one downside is that the PPS signals may suffer from tempco
> on the order of 1 µs/K.
>
> --
> 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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