[time-nuts] Vectron Labs OCXOs Pin-out

Brucekareen at aol.com Brucekareen at aol.com
Mon Mar 2 19:22:28 UTC 2009

In my experience Vectron has not been able/willing to provide info on  
earlier oscillators.  I acquired a  229-7730-9, 100 MHz unit and with an ohmmeter 
decided the pin connections seemed  to match the diagram shown for the current 
CO-706 series.  The question then was whether the supply  voltage should be 12, 
15 or 24 volts.  The unit oscillated with 15v, but plotting the warm-up 
drift, I found  that even after hours of operation the unit did not completely 
warm-up.  The can was barely warm to the  touch.  I then tried 24v and the  
oscillator warmed-up in 16 minutes from a cold start -- that is the direction of  
frequency drift reversed in 16 minutes.  The can was much warmer and reached 
that temperature much faster.  Applying a 0 to +6 v control voltage to  pin 6, I 
was able to shift the frequency about +/- 50 Hz.  The mechanical tuning 
adjustment, at the  top of the housing, allowed shifting the frequency over a much 
wider range.  Initial current at 24v was 200 ma.  This decreased to 105 ma 
after about 30  mins.  Output power at 24v was +7.6  dBm.  At 15v input, output 
power was  a steep function of input voltage. 
Bruce Hunter
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