[time-nuts] Remote GPS Oscillator Steering

[Azelio Boriani]

I think that the best move is to get a second GPSDO for the lab.


On Thu, Apr 18, 2013 at 10:35 AM, Iain Young <iain at g7iii.net> wrote:

> Hi Everyone,
>
> Recently, I have acquired a HP Frequency Counter and Signal Genny, and
> have set up a small "lab" in the house. This is great, but I'd like to
> hook it into my 3816A, which is 70 ft away in an outhouse, along with
> all my radio gear, to at least compare it to the 10811 in the Frequency
> Counter.
>
>
> I'd rather not drill a hole and run a cable (There are other issues
> with that as well as the hole, the outhouse is the other side of the
> garden path from the lab!)
>
> I do have fibre to the house for N/W  connectivity, and (unshielded)
> CAT6 from the patch panel to the "lab".
>
> Two problems here. One the patch panel is the other side of the house
> from the lab (so running a dedicated piece of coax is out without
> taking up the floors..), and Two, 10MHz over unshielded CAT6 is not
> good practice, to say the least, and simply not going to happen.
>
> So I started looking at other possibilities. It seems a lot of GPSDOs
> steer the Oscillator by using the PPS. Is that right ? 1 Hz over UTP is
> a bit more reasonable than 10 MHz, but I did not find many 10MHz
> oscillators with a PPS input.
>
>
> I thought of using a Z3801 instead of the Z3816, but patching out from
> the EFC SBM connector, then (optionally) converting that to fibre,
> sending it up the garden to the house, converting back to copper, then
> the CAT 6 to the Lab where a second Z3801 would sit
>
> I would rather fibre between the house and outhouse for EMC and
> grounding reasons. My hope is that thee 10MHz Osc would then be steered
> from the remote Z3801, although the lab Z3801 itself would complain
> bitterly about no lock no doubt.
>
>
> Does anyone have any comments on this madhat scheme ? Or have other
> suggestions of how I might go about getting that 10MHz signal
> converted to fibre, and back again to send into the "lab" equipment ?
> What are other people's experience with similar issues ?
>
> What do the "big boys" like NIST and NPL do to manage this ? I know
> they transfer time over large distances, and I know NPL transfer
> frequency as well to certain customers, so I guess other similar
> institutions do as well
>
>
> [Note, for me, plug and play is better. Soldering irons do not like me,
> and I wouldn't trust myself with one anywhere near anything like a
> precision instrument :), although putting pre-built modules in a metal
> box I'm okay with, but plug-and play preferred.]
>
> (Googling for fibre converters or similar these days brings up such
> a noise floor of Ethernet, Any suggestions on the best terms
> or part numbers to use to find raw (assembled) fibre transmitter /
> receiver modules that might be suitable would be gratefully received)
>
>
> Best Regards
>
> Iain
>
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