[time-nuts] Why a 10MHz sinewave output?

paul swed paulswedb at gmail.com
Mon Feb 6 15:41:00 UTC 2012

I want to be careful this is not my thread.
the question came up.
Why sine wave.
Though I do appreciate your comments.

On Mon, Feb 6, 2012 at 10:26 AM, Jim Lux <jimlux at earthlink.net> wrote:

> On 2/6/12 6:47 AM, paul swed wrote:
>> Well right you are thats why todays chips have equalizers and such.
>> But then its all getting crazy complicated even though its in a itty bitty
>> chip.
>> My distribution is made of high quality television analog amps and I have
>> in general made amplifiers and such with parts I can still easily pickup
>> and solder to.
>> But still I always do wonder about tinkering with a square wave dist
>> system. Though I doubt I will ever actually do anything.
>> KISS is the general principal.
>> Regards
>> Paul.
> "adaptive equalizer" and "precision frequency/time distribution" are going
> to be very uneasy bedfellows..
> Of course, if you're just looking for distribution of house black burst or
> analog video, that's probably ok.  You're looking for good waveform
> fidelity, rather than precise knowledge of time delays.
> In most of the precision measurement systems I fool with we look for parts
> in 1E10 or better.  Say, 1 degree of phase at 32 GHz.. if you're
> multiplying up from a 10 MHz reference for that, the x3200 multiplication
> means you need to be pretty savvy about how your references are distributed
> (and, as well, how a phase change in the harmonic content might screw up
> the zero crossings)
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