[Elecraft] K3 Drift

[briana]

Guys,

Everything drifts.   It is just a matter of how much and whether that 
amount is acceptable for the proposed use.

I've done extensive drift measurements on the K3 and K3 with high 
stability oscillator.   All comparisons were made to a RB locked 
oscillator.   Up to three days of data was taken.

These were " best case" comparisons (RX on only, no periods of transmit) 
and show the following at 10MHz.
1) The standard oscillator drifts 60- 100 Hz in the first couple hours.  
After that it stays within a couple Hz.
2) The high stability oscillator ( it is not temperature controlled 
because the feedback loop has not been implement) drifts about half that 
amount during a 4 hour period and is stable within a few Hz after that.

Both meet the specs.

What happens with periods of transmit at full power in those intervals 
is unknown.   Most likely it would expand the range observed.

The fact that few people observe drift,  means that during a QSO or two, 
the drift is quite acceptable.   It dosn't mean there is no drift.

73 de Brian/K3KO





On 1/13/2015 1:57 AM, Phil Wheeler wrote:
> News to me, Bob -- but the modes you operate may make it more or (in 
> my case) less noticeable.
>
> It might be good if you provided more into:
>
>  * Which modes?
>  * Only after an extended key-down TX period or
>    on receive, too?
>  * How much drift in what period of time?
>  * Do you have the KTCXO3-1TCXO installed in your
>    K3? (which may be what you mean by
>    "temperature controlled crystal")
>  * How are you measuring the frequency to
>    determine the drift -- i.e., how did you
>    conclude it is drifing?
>
> that sort of thing.
>
> 73, Phil W7OX
>
> On 1/12/15 10:40 PM, Robert Sands wrote:
>> KV6X has noticed his temperature controlled crystal is drifting in 
>> his K3.
>> I notice it too. This is a new thing. I have never seen a post about K3
>> drift. Anyone had this problem??
>> Bob
>> K7VO
>
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