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

[Shawn]

Thank you Bob!

I will look!
-- 
Sincerely,

Shawn Tayler

On Sat, 2023-01-14 at 08:00 -0500, Bob Camp 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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