Thanks for posting that, Gary. As a user of the
XG50 it's reassuring that you have resolved this
issue.
Phil w7ox
On 5/22/14, 9:53 PM, kj...@kj7rt.com wrote:
First I want to thank those that pointed out that my first two postings
didn't contain message content, probably due to using HTML. You were
right, I changed the default for this email program to plain text.
Second thank you to the responders that suggested solutions to my
"instability" non-problem. Turns out it was the input level to the HP
5334A. Adjustment of the counter nailed it pretty close. Stabilized at
49.380000 MHz +-2 Hz.
73
Gary Marklund
KJ7RT
Sun City, AZ
USA
-------- Original Message --------
Subject: [Elecraft] XG50 - Frequency Instability
From: <kj...@kj7rt.com>
Date: Thu, May 22, 2014 7:31 am
To: Elecraft@mailman.qth.net
I am trying to use my XG50 to run the Extended Temperature Compensation
Procedure on my KX3. This is the first time I have attempted to use the
XG50 since building it. I have completed the 8 hour burn-in.
When I first connect the XG-50 to my HP frequency counter, I get a
reading of something like 49.379990. Then after running for several
minutes it starts dropping in frequency to something more like
49.32xxxx. It is still wildly fluctuating. If I connect the 10MHz output
of my Trimble Thunderbolt GPSDO to the counter it stays quite stable
just below 10 MHz.
I re-soldered all the XG50 components and tried with both a metered
home-brew power supply and a 12v SLA battery with the same result
although re-soldering made a significant but not permanent improvement.
My lab is in my photographic darkroom which has an ambient temperature
of about 68 degrees F and the AC does blow across the work area.
Thanks,
Gary Marklund
KJ7RT
Sun City, AZ
USA
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