[Elecraft] Installed K3EXREF

[Brett Howard]

I was one of the beta testers and I tested the unit with the standard
oscillator.  I haven't run into any issues and found the fixed error
across all bands to be quite nice.  I never saw more than about 3Hz of
error no matter the frequency on the VFO dial.  Thats not to mean that
if you have a standard oscillator that is at the outside of its bell
that you may not have enough pull with the KEXTREF3 to pull things
into place.  Personally I never ran into this issue in my testing
however I will probably also get the tighter tolerance rock for use
when away from the 10Mhz reference.  I find it really nice to know
that the radio is on frequency...  However the P3 still has to warm up
before its frequency reference is accurate... ;)

~Brett (N7MG)

On Fri, May 20, 2011 at 7:47 PM, Dan AE9K <AE9K at pkts.net> wrote:
> Ed,
>
> Thanks for the response.  Let me clarify my question.  I'm wondering if the
> KTCXO3 0.5 ppm oscillator can be omitted and still get great results with
> the K3EXREF and the standard 5 ppm oscillator.  This is of interest because
> I intend to acquire the K3EXREF but do not have the KTCXO3 and would prefer
> not to buy it if it doesn't add any benefit.
>
> My logic: If the K3EXREF adjusts the TCXO (via REF CAL) every 4 seconds,
> then why not let it adjust the standard K3 TCXO instead of having it adjust
> the optional KTCXO3 oscillator?
>
> Even though the two oscillators differ by an order of magnitude in their
> error, does that error make a difference when the K3EXREF adjustments are
> every four seconds?
>
> ps - During your beta testing were you using the standard K3 5 ppm
> oscillator or the KTCXO3 0.5 ppm oscillator?  I didn't find mention of that
> on your web site.
>
> Dan
> AE9K
>
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