[Elecraft] K3EXREF Query

[Harry Yingst via Elecraft]

Typically (from my understanding) you leave the TCXO and GPSDO running all the timeI believe the the Rubidium standards have a lamp that wears out in time so some turnthem off to conserve the life of the lamp.
I leave the Oven in my Counter on all the time to keep it stable.
I just purchased a GPSDO and plan to leave it on all the time.


As for the expense....to me the expense is minimal.





      From: Mike Harris <mike.harris at horizon.co.fk>
 To: elecraft at mailman.qth.net 
 Sent: Tuesday, October 14, 2014 10:35 AM
 Subject: Re: [Elecraft] K3EXREF Query
   
Why not just leave the frequency reference switched on.  OK with a TCXO, 
not so good with a Rubidium standard.  Power consumption must be trivial 
compared with the normal domestic base load.

Regards,

Mike VP8NO

On 14/10/2014 10:41, David G4DMP wrote:
> I have not seen any replies to this, Brian.
>
> As I see it, the only way out is to go into REF CAL from the Config menu
> and then press 2 to disable XREF until the frequency standard has
> locked.
>
> Like you, I have found that if XREF is enabled when the K3 is switched
> on, the K3 drifts unacceptably for 15 minutes until the frequency
> standard has settled down.
>
> 73 de David G4DMP
>
> In a recent message, Brian <alsopb at nc.rr.com> writes
>> I was wondering if there is any kind of "sensibility" check done on the
>> input reference?
>>
>> For example, I've been fooling around with a double oven controlled XO.
>>
>> Starting from cold it is > 200Hz off.  It takes ten minutes or so to be
>> within 10 Hz. It gets into the tenths of Hz accuracy region in another
>> 10 minutes.
>>
>> Clearly one would not want the K3EXREF to lock to this oscillator
>> during the first 10 minutes or so.
>>
>> 73 de Brian/K3KO
>
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