[time-nuts] Re: Spectracom 8143 GPS Disciplined Osc

[paul swed]

I did download the manual and good news according to it there are 5 X 10
MHz outputs on the back.
Now thats useful. The telco stuff is derived from the 10 MHz. Not useful.
No schematics. This must have been near the end when they were no longer
included.

XXX If you do not have the spectracom antenna, measure the center pin to
ground. Without any antenna.
Way back when that could be 12-15V. Especially if the antenna had a down
converter in it. Do not believe these did.
Modern antennas are 3.3 or 5V. Don't want to let the smoke out.
XXX

Good luck. Are you going to fire them up?
Regards
Paul
WB8TSL

On Sat, Jan 14, 2023 at 11:31 AM Bob Camp via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi
>
> The 8195 dates back more than 20 years. That’s not to say the ones you
> have are > 20
> years old, only that it is a possibility. The GPS system week roll over
> stuff is likely to impact
> a device like this ( or has already ). It may manifest as the date simply
> being 1024 weeks off.
> That may not matter at all in this application. I don’t know if the end
> user expects accurate
> date information from the system.  If they do expect accurate date, the
> GPS module would
> need to be replaced with a newer one that has an identical command
> structure.
>
> Even if the end user isn’t running time and date from the unit, you likely
> will run into it as
> you fire them up and run through all the “does it lock ok” sort of tests.
> If it’s off, that’s expected.
> You just move on.
>
> Next up on a device like this is the OCXO. Again, it only *may* be 20+
> years old. Regardless,
> it’s worth checking the EFC voltage to make sure it’s still reasonably
> centered. If it’s off within
> 20% of either limit, that should be addressed. The OCXO *might* have a
> mechanical tune ( I
> doubt it) or it would need to be replaced.
>
> Final steps might involve checking the offset accuracy ( = are the
> internal synthesizers still
> working ok? ) and the phase noise on the outputs.
>
> Bob
>
>
>
> > On Jan 13, 2023, at 6:47 PM, Shawn via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Hi Paul,
> >
> > Yes, my mistake, It was the 8195 Oscillator with the 8143 switch.  I
> > should've referred to the Oscillator number.
> >
> > I'd like to re-ask the same re. the 8195.  These units have 10MHz with
> > 1.544 and 1pps outputs.
> >
> > --
> > Sincerely,
> >
> > Shawn Tayler
> >
> > On Fri, 2023-01-13 at 10:43 -0500, paul swed via time-nuts wrote:
> >> Shawn I don't think the 8143 is an oscillator or pair.
> >> Its a master/backup switch and distribution amplifier.
> >> Nice unit. One on the auction site with good pix.
> >> Believe you should be able to find a manual on it.
> >> Spectracom manuals had been available online. Maybe not anymore.
> >> Good luck
> >> Paul
> >> WB8TSL
> >>
> >> On Fri, Jan 13, 2023 at 10:05 AM Shawn via time-nuts <
> >> time-nuts at lists.febo.com> wrote:
> >>
> >>> Hey Guys,
> >>>
> >>> I may have do a cleanup and refurb on some fairly old Spectracom
> >>> 8143
> >>> Disciplined Oscillators.  Are there some good resources and/or
> >>> places
> >>> to look for proper Care and Feeding type information?
> >>>
> >>> They are being used in a communications system to synchronize
> >>> Simulcast
> >>> Communications as well as an older TDM style voice switch.  There
> >>> are
> >>> two in an A/B backup configuration.
> >>> --
> >>> Sincerely,
> >>>
> >>> Shawn Tayler
> >>> _______________________________________________
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> >>>
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