[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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