[time-nuts] OCXO Adjustment Question

J. L. Trantham jltran at att.net
Wed May 8 13:48:02 EDT 2013


Be careful about the 'tweaking'.  It can become very addicting.  Short of a
GPSDO, you'll always have to tweak from time to time.  The problem is being
able to define what tolerance you are willing to accept and how often you
don't mind tweaking.

Otherwise, you never get any work done, just spend your time 'tweaking'.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Frederick Bray
Sent: Wednesday, May 08, 2013 11:21 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] OCXO Adjustment Question

Thanks for all the helpful suggestions and comments so far.  I will answer a
few of the questions that have been raised.

The device definitely is an OCXO as it is in an oven and gets warm. It is an
Ovenaire 73-25.

As one person commented, there are two 10 MHz outputs on the device.  
Actually, it appears that the Ovenaire has one output and there is a
resistor network external to the device that splits the signal.

So far, the range seems to be from around 9.999975 to 10.000025 and it has
been on for over 18 hours.

I am going to let it sit for a bit and then try the various tool options
that have been suggested.

One suggestion was to replace the Ovenaire with something like a Morion
MV89.  That would seem to be a good long-term option.

All of this started as an attempt to track down an "unlock" problem with the
5110 to see whether there was any output from the Ovenaire.  When it turned
out that the OCXO was working, I gave into the temptation to tweak the

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