[Elecraft] re: K1 VFO drift

[michael]

Thanks for the responses that I got to my K1 VFO drift posting 
yesterday.
I decided to extend my "test" for another hour and what I found was that
the K1 display showed no change in frequency after an additional hour.

My conclusion, "if it ain't broke, don't fix it". I think that it would 
be hard to
improve on this.  I guess the only question remaining is, why did I 
think that
there was a problem?  I guess that I should plan to hook the rig to 
power
before doing anything else when I setup for portable operation. That way
by the time I have the antenna up and everything else ready to go the
frequency will have stabilized.

Michael VE3WMB

>
> I hooked my K1 up to a well regulated 13.8 V supply, turned it on, 
> tuned
> it to 7.040 MHZ, started a timer and let it be. Note that the rig was 
> inside the
> air-conditioned house at a temperature of 24c and not subject to any 
> vibration.
>
> Here is what I observed
>
> time: 5  min   total drift: -200hz  (freq 7039.8 mhz)
> time: 30 min  total drift: -300hz  (freq 7039.7 mhz)
> time: 60 min  total drift: -300hz  (freq 7039.7 mhz)
>
> So it appears that I am getting approximately 300hz drift down in 
> frequency
> in the first 30 minutes and then things stabilize.
>
> I checked the Specs in the front of the manual and it says < 200 hz / 
> hour after a 5
> minute warm up at 25 degrees C so I guess that technically things are 
> within spec
> as I am seeing only about an additional 100hz drift within the first 
> hour, after the initial
> 5 minute warm up.
>