[time-nuts] Re: Coupling between oscillators -- an example

[Bob kb8tq]

Hi

> On Mar 26, 2022, at 6:37 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> 
> 
> 
> On 3/25/2022 12:41 PM, John Ackermann N8UR wrote:
>> PS -- an interesting feature of these oscillators is that they are an "S12" variant that has a little accelerometer bolted on and hooked to the EFC circuit to compensate for G forces.  These were ship-board Cs units, so I wonder if the accelerometers were intended to compensate for ordinary ship vibrations, or maybe the firing of the big guns. :-)
> 
> During the initial debug of the early 5071 prototypes (circa 1990)
> it somehow came to light that 5061's on ships had a phenomenon where
> the frequency would be slightly, but noticeably affected by the
> slow rolling motion of the ship.  Len Cutler and our CBT genius
> figured out that the problem was in the cesium beam tube.  Therefore,
> the 5071 would also exhibit this problem.  The CBT was modified before
> the 5071 release and the problem was eliminated.  IIRC, the problem
> had to do with the Cs atoms being ballistic objects that didn't hit
> the bulls eye if the CBT was moving.  I seem to recall that the
> problem was a result of some other problem they tried to fix, but
> the fix was too clever by half as they say.
> 
> Possibly, this is related to the units you have.
> 
> Regarding big guns:  one of the specs the 5071 (and 5061) had to meet
> was the "hammer blow test" which simulates the firing of big guns,
> using a 400 pound hammer that strikes a frame in which the DUT
> is mounted.

I was under the impression that the hammer blow gizmo was designed
to emulate the impact of a torpedo in a nearby compartment….. The
force it produces does not appear to be something a person could 
survive…..

>  It's OK if the DUT suffers structural damage ...
> as long as the DUT keeps working.  I think it is allowed to
> momentarily go off frequency during the test.

Again, going by (possibly incorrect) memory: The “test” is permitted 
to blow fuses. The device needs to operate after they are replaced. 

Crazy 

Bob

> 
> Rick N6RK
> 
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