[time-nuts] Morion MV89A Repair

Bob Camp lists at rtty.us
Sun Feb 26 23:12:38 UTC 2012


Hi

Most people put the best of the batch in the paper. It is indeed odd that the very experienced authors of the paper did not do so. With low drive a 5 MHz HC-40 should get into parts in the thirteenth over much of the bathtub region.

Bob



On Feb 26, 2012, at 3:22 PM, "John Miles" <jmiles at pop.net> wrote:

>> The other interesting thing in the paper is that the short term numbers
>> shown aren't into parts in the 13th.
> 
> The ADEV plot in figure 3 doesn't exactly show the oscillator in its best
> light.   The right side of the 'bathtub' is well beyond 1000 seconds with
> these parts, if you actually let them warm up before you measure them.
> 
> So the person who generated the plot either didn't allow sufficient warmup
> time, or they used a low-quality reference.  The Ch A versus Ch B amplitudes
> are almost 3 dB apart, so they probably were not using another MV89A.
> 
> -- john
> 
> 
> 
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