[Milsurplus] Even Worse

[J. Forster]

I don't have the slightest issue with a house standard in a test facility.
and have all my RF instrumentation locked to mine, including synthesizers,
SA, counters, and receivers.

It's just the audio use I question.

-John

=============

>
>  Where I actually work, we do have a "house"10 MHz GPS derived reference
> and it is "plumbed" to all the benches that build frequency counters and
> signal sources. All the instruments that have internal clock modules have
> to be zero beated to the house standard in the free running mode.These
> are microwave instruments where accuracy counts.
> Jay KE6PPF
>
>
>
>
>
> -----Original Message-----
> From: J. Forster <jfor at quik.com>
> To: sdaitch at kuw.ibb.gov
> Cc: milsurplus at mailman.qth.net
> Sent: Sun, Jul 4, 2010 11:37 am
> Subject: Re: [Milsurplus] Even Worse
>
>
> I have no doubt that some communication systems require very good clocks,
> ut in this case, the clock is being used to "synchronize" things like CD
> nd record players and possibly a digital mixer in a house. It's not like
> he boxes are separated by more than a few score feet.
> I could possibly see it in an all-digital recording studio, but even there
> t's likely huge overkill.
> -John
> ===============
>
>>
>
>  Many digital communications systems have GPS related time bases, I can
>  guess only to eliminate digital jitter in recovering the synch timing
> from
>  an incoming data signal.
>  Quite a few years back, I was acquainted with a DS-3 capable digital
>  microwave system, which originally was using LORAN receivers to establish
>  the timing signals for the terminals.  At one particular installation,
>  there was so much interference at 100 kHz that LORAN was useless.  A
>  cesium beam standard was installed for the timing signals and that was in
>  use until the system was deactivated.
>  This microwave system supported mostly telephone circuits, I was told,
> and
>  we know what the freuqency response and distortion requirements are for a
>  telco circuit.
>  73
>  Sheldon
>
>
>  ----- Original Message -----
>  From: "J. Forster"
>  Date: Sunday, July 4, 2010 0:31 am
>  Subject: Re: [Milsurplus] Even Worse
>
>> But that's not nearly Audiophool grade!
>>
>> I was talking about syncing the internal CD and record player
>> clocks to GPS.
>>
>> -John
>>
>> ===============
>>
>> > The power companies already do that and is able to compare phasors
>> > across the grid. Check out NASPI, the North American SynchroPhasor
>> > Initiative.
>
>
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