SM
S McGrath
Sat, Jan 14, 2023 4:29 PM
Its being used to synchronize telco gear so the 1.544 frequency(T1 clock)
is correct for application. Who misses those giant V.35 serial
connectors (assuming unit did not have integrated CSU/DSU)
On Sat, Jan 14, 2023 at 11:24 AM paul swed via time-nuts <
time-nuts@lists.febo.com> wrote:
Did you do a search online? The manual is readily available.
Should be a useful unit IF you can change the 1.544 MHz to something useful
like 5 or 10 MHz.
Did not look at the schematic to see how they make the 1.544 MHz. Thats a
telco clock frequency.
Regards
Paul
WB8TSL
On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts <
time-nuts@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@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
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Its being used to synchronize telco gear so the 1.544 frequency(T1 clock)
is correct for application. Who misses those giant V.35 serial
connectors (assuming unit did not have integrated CSU/DSU)
On Sat, Jan 14, 2023 at 11:24 AM paul swed via time-nuts <
time-nuts@lists.febo.com> wrote:
> Did you do a search online? The manual is readily available.
> Should be a useful unit IF you can change the 1.544 MHz to something useful
> like 5 or 10 MHz.
> Did not look at the schematic to see how they make the 1.544 MHz. Thats a
> telco clock frequency.
> Regards
> Paul
> WB8TSL
>
> On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts <
> time-nuts@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@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
> > > > _______________________________________________
> > > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > > >
> > > _______________________________________________
> > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@lists.febo.com
> > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
>
PS
paul swed
Sat, Jan 14, 2023 4:40 PM
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@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 <
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@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
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
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@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@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@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
> >>> _______________________________________________
> >>> time-nuts mailing list -- time-nuts@lists.febo.com
> >>> To unsubscribe send an email to time-nuts-leave@lists.febo.com
> >>>
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts@lists.febo.com
> >> To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@lists.febo.com
> > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
J
JC
Sat, Jan 14, 2023 4:57 PM
No problem, Shawn, and thanks to Davem for the complete manual. I don't
know why I didn't download it when it was available.
John
On Sat, Jan 14, 2023 at 10:47 AM paul swed via time-nuts <
time-nuts@lists.febo.com> wrote:
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@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
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 <
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@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
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
No problem, Shawn, and thanks to Davem for the complete manual. I don't
know why I didn't download it when it was available.
John
On Sat, Jan 14, 2023 at 10:47 AM paul swed via time-nuts <
time-nuts@lists.febo.com> wrote:
> 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@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@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@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
> > >>> _______________________________________________
> > >>> time-nuts mailing list -- time-nuts@lists.febo.com
> > >>> To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > >>>
> > >> _______________________________________________
> > >> time-nuts mailing list -- time-nuts@lists.febo.com
> > >> To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > > _______________________________________________
> > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@lists.febo.com
> > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
S
Shawn
Sat, Jan 14, 2023 8:25 PM
Thanks Paul,
These clocks are still in service but have not had any TLC. I will
search for the manual.
I was more interested in any experiences that may be out there with
care and feeding issues. I know that Spectracom liked them to come
back every few years but they were never very forthcoming as to why.
I also believe there may be aging issues that might contribute to
sporadic behavior, they are circa 1999-2001 and may've been back early
in their life but have not for at least 10 years. The systems they are
part of need to keep going for at least 2-3 more years and there have
been some suspicious clocking related events, all very subtle, that
could be related to their extended service life.
--
Sincerely,
Shawn Tayler
On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
Did you do a search online? The manual is readily available.
Should be a useful unit IF you can change the 1.544 MHz to something
useful like 5 or 10 MHz.
Did not look at the schematic to see how they make the 1.544 MHz.
Thats a telco clock frequency.
Regards
Paul
WB8TSL
On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
time-nuts@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.
Thanks Paul,
These clocks are still in service but have not had any TLC. I will
search for the manual.
I was more interested in any experiences that may be out there with
care and feeding issues. I know that Spectracom liked them to come
back every few years but they were never very forthcoming as to why.
I also believe there may be aging issues that might contribute to
sporadic behavior, they are circa 1999-2001 and may've been back early
in their life but have not for at least 10 years. The systems they are
part of need to keep going for at least 2-3 more years and there have
been some suspicious clocking related events, all very subtle, that
could be related to their extended service life.
--
Sincerely,
Shawn Tayler
On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
> Did you do a search online? The manual is readily available.
> Should be a useful unit IF you can change the 1.544 MHz to something
> useful like 5 or 10 MHz.
> Did not look at the schematic to see how they make the 1.544 MHz.
> Thats a telco clock frequency.
> Regards
> Paul
> WB8TSL
>
> On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
> <time-nuts@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.
> >
S
Shawn
Sat, Jan 14, 2023 8:28 PM
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@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@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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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@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@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
> > > > _______________________________________________
> > > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > > >
> > > _______________________________________________
> > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@lists.febo.com
> > To unsubscribe send an email to time-nuts-leave@lists.febo.com
>
S
Shawn
Sat, Jan 14, 2023 8:30 PM
Yes, the gear is Two Way Radio but using T1 serial data technology.
Sincerely,
Shawn Tayler
On Sat, 2023-01-14 at 11:29 -0500, S McGrath via time-nuts wrote:
Its being used to synchronize telco gear so the 1.544 frequency(T1
clock)
is correct for application. Who misses those giant V.35 serial
connectors (assuming unit did not have integrated CSU/DSU)
On Sat, Jan 14, 2023 at 11:24 AM paul swed via time-nuts <
time-nuts@lists.febo.com> wrote:
Did you do a search online? The manual is readily available.
Should be a useful unit IF you can change the 1.544 MHz to
something useful
like 5 or 10 MHz.
Did not look at the schematic to see how they make the 1.544 MHz.
Thats a
telco clock frequency.
Regards
Paul
WB8TSL
On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts <
time-nuts@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@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
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to
time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
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Yes, the gear is Two Way Radio but using T1 serial data technology.
--
Sincerely,
Shawn Tayler
On Sat, 2023-01-14 at 11:29 -0500, S McGrath via time-nuts wrote:
> Its being used to synchronize telco gear so the 1.544 frequency(T1
> clock)
> is correct for application. Who misses those giant V.35 serial
> connectors (assuming unit did not have integrated CSU/DSU)
>
> On Sat, Jan 14, 2023 at 11:24 AM paul swed via time-nuts <
> time-nuts@lists.febo.com> wrote:
>
> > Did you do a search online? The manual is readily available.
> > Should be a useful unit IF you can change the 1.544 MHz to
> > something useful
> > like 5 or 10 MHz.
> > Did not look at the schematic to see how they make the 1.544 MHz.
> > Thats a
> > telco clock frequency.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts <
> > time-nuts@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@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
> > > > > _______________________________________________
> > > > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > > > To unsubscribe send an email to
> > > > > time-nuts-leave@lists.febo.com
> > > > >
> > > > _______________________________________________
> > > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > > _______________________________________________
> > > time-nuts mailing list -- time-nuts@lists.febo.com
> > > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> > _______________________________________________
> > time-nuts mailing list -- time-nuts@lists.febo.com
> > To unsubscribe send an email to time-nuts-leave@lists.febo.com
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
PS
paul swed
Sat, Jan 14, 2023 9:29 PM
Cracking up. Circa 2000. Well I have a few bits still working from 1994 and
earlier. Mostly HP test equipment.
That said the typical things that age are mechanical things like fans. Next
the filer caps. Its possible some semiconductors but I have rarely run into
that. Its caps caps caps.
With respect to sending it back, I am sure they checked things out like
sensitivity. But more importantly they may have recentered the OCXO tuning
and lock range. That would be my guess.
Good luck.
On Sat, Jan 14, 2023 at 3:25 PM Shawn comsec@xmtservices.net wrote:
Thanks Paul,
These clocks are still in service but have not had any TLC. I will
search for the manual.
I was more interested in any experiences that may be out there with
care and feeding issues. I know that Spectracom liked them to come
back every few years but they were never very forthcoming as to why.
I also believe there may be aging issues that might contribute to
sporadic behavior, they are circa 1999-2001 and may've been back early
in their life but have not for at least 10 years. The systems they are
part of need to keep going for at least 2-3 more years and there have
been some suspicious clocking related events, all very subtle, that
could be related to their extended service life.
--
Sincerely,
Shawn Tayler
On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
Did you do a search online? The manual is readily available.
Should be a useful unit IF you can change the 1.544 MHz to something
useful like 5 or 10 MHz.
Did not look at the schematic to see how they make the 1.544 MHz.
Thats a telco clock frequency.
Regards
Paul
WB8TSL
On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
time-nuts@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.
Cracking up. Circa 2000. Well I have a few bits still working from 1994 and
earlier. Mostly HP test equipment.
That said the typical things that age are mechanical things like fans. Next
the filer caps. Its possible some semiconductors but I have rarely run into
that. Its caps caps caps.
With respect to sending it back, I am sure they checked things out like
sensitivity. But more importantly they may have recentered the OCXO tuning
and lock range. That would be my guess.
Good luck.
On Sat, Jan 14, 2023 at 3:25 PM Shawn <comsec@xmtservices.net> wrote:
> Thanks Paul,
>
> These clocks are still in service but have not had any TLC. I will
> search for the manual.
>
> I was more interested in any experiences that may be out there with
> care and feeding issues. I know that Spectracom liked them to come
> back every few years but they were never very forthcoming as to why.
>
> I also believe there may be aging issues that might contribute to
> sporadic behavior, they are circa 1999-2001 and may've been back early
> in their life but have not for at least 10 years. The systems they are
> part of need to keep going for at least 2-3 more years and there have
> been some suspicious clocking related events, all very subtle, that
> could be related to their extended service life.
>
>
> --
> Sincerely,
>
> Shawn Tayler
>
> On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
> > Did you do a search online? The manual is readily available.
> > Should be a useful unit IF you can change the 1.544 MHz to something
> > useful like 5 or 10 MHz.
> > Did not look at the schematic to see how they make the 1.544 MHz.
> > Thats a telco clock frequency.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
> > <time-nuts@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.
> > >
>
BC
Bob Camp
Sat, Jan 14, 2023 10:36 PM
Hi
Weird unlock issues could easily be related to a 20+ year old GPS module. The RF
spectrum has become a lot more dirty up at GPS than it once was. You may simply
be seeing the module’s inability to cope with the “modern” RFI …..
Bob
On Jan 14, 2023, at 3:25 PM, Shawn via time-nuts time-nuts@lists.febo.com wrote:
Thanks Paul,
These clocks are still in service but have not had any TLC. I will
search for the manual.
I was more interested in any experiences that may be out there with
care and feeding issues. I know that Spectracom liked them to come
back every few years but they were never very forthcoming as to why.
I also believe there may be aging issues that might contribute to
sporadic behavior, they are circa 1999-2001 and may've been back early
in their life but have not for at least 10 years. The systems they are
part of need to keep going for at least 2-3 more years and there have
been some suspicious clocking related events, all very subtle, that
could be related to their extended service life.
--
Sincerely,
Shawn Tayler
On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
Did you do a search online? The manual is readily available.
Should be a useful unit IF you can change the 1.544 MHz to something
useful like 5 or 10 MHz.
Did not look at the schematic to see how they make the 1.544 MHz.
Thats a telco clock frequency.
Regards
Paul
WB8TSL
On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
time-nuts@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.
Hi
Weird unlock issues could easily be related to a 20+ year old GPS module. The RF
spectrum has become a lot more dirty up at GPS than it once was. You may simply
be seeing the module’s inability to cope with the “modern” RFI …..
Bob
> On Jan 14, 2023, at 3:25 PM, Shawn via time-nuts <time-nuts@lists.febo.com> wrote:
>
> Thanks Paul,
>
> These clocks are still in service but have not had any TLC. I will
> search for the manual.
>
> I was more interested in any experiences that may be out there with
> care and feeding issues. I know that Spectracom liked them to come
> back every few years but they were never very forthcoming as to why.
>
> I also believe there may be aging issues that might contribute to
> sporadic behavior, they are circa 1999-2001 and may've been back early
> in their life but have not for at least 10 years. The systems they are
> part of need to keep going for at least 2-3 more years and there have
> been some suspicious clocking related events, all very subtle, that
> could be related to their extended service life.
>
>
> --
> Sincerely,
>
> Shawn Tayler
>
> On Fri, 2023-01-13 at 21:57 -0500, paul swed wrote:
>> Did you do a search online? The manual is readily available.
>> Should be a useful unit IF you can change the 1.544 MHz to something
>> useful like 5 or 10 MHz.
>> Did not look at the schematic to see how they make the 1.544 MHz.
>> Thats a telco clock frequency.
>> Regards
>> Paul
>> WB8TSL
>>
>> On Fri, Jan 13, 2023 at 7:33 PM Shawn via time-nuts
>> <time-nuts@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.
>>>
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
