[time-nuts] phase lock

Chuck Forsberg WA7KGX N2469R caf at omen.com
Sat Dec 24 01:03:23 EST 2011


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>
>
> Non-Stop Computer PTY LTD
>
> 79 Devon St
>
> North Epping
>
> NSW 2121
>
> Australia
>
> Email: service at non-stop.com.au
>

-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430




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