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

[Bob Camp]

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 at 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 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.
>>> 
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