[TenTec] OMNI VI crystal oven stability

[Steve Ellington]

Just some rambling thoughts......

Do you keep the power supply turned on at all times inorder to keep that
oven
warm? Seems to me that if you did then the 3 minute warm up would be a
mute point.
How about leaving the power on all night with the radio off and running
this test again?
60hz drift sounds about righ if these were the conditions. If not then I
would say there is a problem.

I also wonder about the effects of voltage regulation on that oven.
Would it make sense to check the warm up drift of your power supply and
see if it follows the same pattern?
Of course, we assume the counter isn't drifting. I've got one of those
same types and it's really stable so that's probably not the problem.

I've got a digital thermometer from Radio Shack here. What could we
learn from fastening the outdoor probe to the oven? Maybe we could
measure the efffects of
voltage vs. temp.

N4LQ



Clark Savage Turner WA3JPG wrote:

> I took some data from my master oscillator.  I waited 3 minutes for
> the oven to settle down before taking measurements.  I set the
> trimmer cap to a reference frequency of 10.00001   and went from
> there.  I used the Startek frequency counter with 10 Hz resolution.
>
> Began at 20:30 and measured 10.00001
>          20:40              10.00002
>          20:50              10.00003
>          21:20              10.00004
>          21:58              10.00005
>          22:22              10.00006
>
> There are some points where I observed flutter where the freq counter
> was transitioning, so these times are not really exact, and only give
> 10 Hz resolution.  However, there is a definite trend :-).  Would
> you all say that this is not acceptable for the Ten Tec OMNI VI
> master oscillator crystal oven?  Should I go out and fork over the
> $50 for a new one?
>
> I will check on my BFO next for good measure, it has been suggested
> that problems can reside there also.  I will check the trimmers in
> different modes for alignment, and watch some of them to see if they
> move much.
>
> Thanks for all the comments and suggestions.
>
> Clark
> WA3JPG
>
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