[Elecraft] XG50 - Frequency Instability

[Edward R Cole]

Gary,

I used my XG3 for doing the temperature compensation procedure and 
continuously monitored its frequency with my EIP538 counter (has TCXO 
reference).  I ran the XG3 from external 13.5v to ensure constant 
level and had it running 30-minutes in advance to ensure it was 
stabilized.  I noted only about +/- 1 to 2 Hz variation in the signal 
during the whole procedure.  My attempts to use the 5th overtone of 
my 10-MHz OCXO was unsuccessful due to the harmonic level not being 
high enough.  I didn't try "banging" a diode to produce higher level harmonics.

I am fairly satisfied the XG3 was adequately good enough for doing 
the procedure.  I suspect your A/C is causing a cold draft producing 
the drift you are seeing.  Try enclosing in inside an insulated 
box.  We have no A/C here in Alaska.  If it gets warm enough we open 
what are called windows!  But I used to live in SoCal so understand 
the need down there!

73, Ed - KL7UW

------snip
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


73, Ed - KL7UW
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