[time-nuts] My Racal-Dana 1992

Chuck Forsberg WA7KGX N2469R caf at omen.com
Fri Dec 16 06:23:39 EST 2011


Forgot to mention, each point is slightly more than 1 second.

On 12/16/2011 03:19 AM, Chuck Forsberg WA7KGX N2469R wrote:
> Has a 9462 oscillator module in it.
> I've been fooling with little C hacks to make freq and phase 
> measurements via GPIB.
>
> In my desire to super-tweek the timebase I discovered that small 
> adjustments take
> many minutes to settle down.  It's like herding cats.
>
> I noticed that physical shocks would randomize the frequency over a 10 
> Hz range
> at 10 MHz.  What's more, the new frequency didn't seem to  take 10 
> minutes to
> settle down.  So I tapped on the oven with the screwdriver until it 
> landed right on frequency.
> The resulting plot is attached.
>
> Come to think of it, I could use the counter to measure the time 
> between 1pps and WWVB
> zero crossing as an ultimate frequency reference as well as detecting 
> changes in the ionosphere.
>
>
>
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-- 
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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