[time-nuts] "Chinese" MV89A OCXO oven oscillation

[Yuri Ostry]

Hello,

Does anyone have any experience in fixing MV89A's that have oven
oscillation after warm-up (current consumption fluctuate with a
0.8-0.9 sec period from almost zero to approx 0.7A)?

While cold, OCXO drawing about 0.96A and there is no fluctuations.
During warm-up current drops, and somewhere around 0.55A it started to
oscillate. Amplitude of oscillation is rising slowly, and in a minute
or two reaches maximum.

Purchased three OCXO from ggg*fitting few months ago. As always, good
working condition was promised.

Two of three had really good external appearance, third was dropped,
one of corners was bent.

Just got time to test - all three were defective (broken output bypass
cap). One in addition have lots of spurs in output spectrum, and
another have oscillating oven.



-- 
Sincerely,
 Yuri                          mailto:yuri at ostry.ru