[GPS_Standard] Replacement 10 MHz Oscillators

[Bert, VE2ZAZ]

P M,

Another couple of observations. The frequency is measured (averaged out) by
the systrem over a period of an hour or more. If the frequency moves around
during that period, the system will be unable to calculate a valid
adjustment to make.

A double-oven will not improve your situation much. This is not the root
cause of the instability. Many OCXOs on the market (including mine) are
single-oven-based and do much much better than that. Some areas to look at
(in no particular order) are DC dupply stability and filtration, oven
temperature set point, oven temperature regulation, oven mass, crystal
quality, crystal type, output load buffering....

Lucky you...one day I will be able to say the same about my professional
work...

73s

Bert, VE2ZAZ

----- Original Message -----
From: "P M Gant" <ha5rxz at gmail.com>
To: <gps_standard at mailman.qth.net>
Sent: Friday, November 09, 2007 6:14 AM
Subject: [GPS_Standard] Replacement 10 MHz Oscillators


OK, now I have something to aim for. The drift of 3 Hz per hour is not
all in one direction and is probably due to changes in ambient
temperature, thermometer calibration or frequency counter drift, I may
therefore need to move to a double oven. Also, I have only been
working on this for seven days. Further improvement in the drift
figures can therefore be expected.

It's a good job that I am retired, there is no quick way to do this.

HA5RXZ
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