[time-nuts] phase lock

[Chuck Forsberg WA7KGX N2469R]

I have  a Racal-Dana 1992 Nanosecond Universal Counter that includes
a phase measuring function.  I also have a GPIB interface and wrote some
C code to log these readings which can be displayed with gnuplot.

The phase should be measured for a very long time - days perhaps.  The 
ability
to record the phase over that period is useful because the Thunderbolt will
have considerable (compared to the Rb) short term variance.

You could use a scope.  If the X and Y channels can hack 10 MHz you can do a
Lissajous pattern.  Otherwise display one and trigger on the other.

The frequency should be within a fraction of one Hz before worrying 
about the phase.

On 12/23/2011 03:32 PM, Mark C. Stephens wrote:
>
> Hello Chuck, I noticed with interest you compared a thunderbolt to a 
> RB standard using phase lock.
>
> I wonder how you measured the phase lock?
>
> My thoughts would be to use an Oscilloscope but do you have another 
> method?
>
> Many thanks, Mark
>
> *Kind Regards,*
>
> Mark Stephens
>
> **
>
> *Mark C Stephens* | Customer service engineer | Non-Stop Computer Ltd
>
> (+61 2 9011 8186 | (+61 428 256 334 | +marks at non-stop.com.au 
> <mailto:marks at non-stop.com.au>
>
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>
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>
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>
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>
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>
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>

-- 
Chuck Forsberg WA7KGX N2469Rcaf at omen.com    www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
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