[time-nuts] Making a HP 10811 better
Bob Camp
lists at rtty.us
Sat Mar 27 17:19:32 UTC 2010
Hi
Gee, I wonder where you would go to buy a product like that .....
One of the early ways they "discovered" the airborne radar / vibration issue was when they found they could not pick up cars on the autobahn with the radar in an F-16(?).
Bob
On Mar 27, 2010, at 1:13 PM, Hal Murray wrote:
>
>> In most real environments vibration is a three axis sort of thing. In order
>> to optimize you would also need vector information about your vibration
>> environment to really make use of your knowledge about the oscillator. Even
>> lining up with your major vibration axis will normally only help a bit.
>> Things tend to move up / down, left / right and front / back all at the same
>> time.
>
> A while ago, somebody provided a URL discussing vibration and crystals. The
> context was radar on helicopters. The vibration smeared out the signal
> enough to cause problems. The fix was accelerometers and a system to tweak
> the voltage on the crystal to compensate. It was a fun read.
>
>
> --
> These are my opinions, not necessarily my employer's. I hate spam.
>
>
>
>
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