[Milsurplus] Even Worse

[J. Forster]

I have no doubt that some communication systems require very good clocks,
but in this case, the clock is being used to "synchronize" things like CD
and record players and possibly a digital mixer in a house. It's not like
the boxes are separated by more than a few score feet.

I could possibly see it in an all-digital recording studio, but even there
it'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.
>