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

[paul swed]

John
Totally agree on the power and ground. Good to know you like to take them
apart if required.


On Sun, May 9, 2021 at 2:09 PM John Miller via time-nuts <
time-nuts at lists.febo.com> wrote:

> I take everything apart, so that much is a given - I just also like to
> have as much original documentation as I can, especially if there are any
> special initialization or configuration commands. Whatever I find I will
> document for anyone else who gets one of these in the future. Generally
> speaking once power and ground are found everything else more or less falls
> in place.
>
> John
>
> > On May 9, 2021, at 10:48 AM, paul swed <paulswedb at gmail.com> wrote:
> >
> > Back to the problem for a minute.
> > I have used some pctel antennas and they have been very good over the
> > years. (Very good = works). The model number at least gives you a hint if
> > RS 422 or 232. But if you can't find any further detail you are stuck
> with
> > one option.
> > Open it up and look. Most of these antennas can be opened and then
> > re-assembled. The hardest part is ensuring a good seal.
> > With respect to what's inside it should be reasonably apparent. Ground,
> > Power to some linear regulator, maybe a RS422 chip or 232 driver.
> Expected
> > leads for 422 nema and 1 pps so that would be 4 pins right there.
> > So you would be able to get the unit going if your willing to dig in. Pun
> > intended.
> > Good luck and let us know what you find.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Sun, May 9, 2021 at 8:11 AM Poul-Henning Kamp <phk at phk.freebsd.dk>
> wrote:
> >
> >> --------
> >> Mike Ingle writes:
> >>
> >>> Hi, in reading between the lines, are you saying that in practice, the
> >>> tempco of twisted pair is worse than the tempco of coax?
> >>
> >> I seriously doubt it.  The change in coppers conductivity will not make
> >> that kind of difference in propagation time until the cables are
> measured
> >> in kilometers.
> >>
> >> I suspect the tempco comes from the RS-422 linedriver chip in the
> antenna
> >> or possibly from ceramic capacitors used to control its slew-rate.
> >>
> >> --
> >> 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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