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K3 ref osc calibration question

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Andrew Moore-3

K3 ref osc calibration question

I'm performing a calibration on my K3's TXCO (5 ppm version).
K3 is new/recent build, serial 44xx

K3 owner's manual, Rev. L, page 49.
"Method 2 (zero-beating)"

I'm using an Elecraft XG2 signal generator at roughly 14.060 MHz

Procedure says to enter CW mode and tune to the specified frequency (in this
case, I don't know it, as every XG2 is probably a little different)

Since I don't know the exact frequency, can I spot it with the Spot
function, and then proceed to the REF CAL adjustment? Or is there a catch
22 here, as the spot function may not be accurate until the TXCO is
calibrated?

--Andrew
NV1B
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Andrew Moore-3

Re: K3 ref osc calibration question

I ended up using WWV at 20.0 MHz.

Works great.

Problem was that the freq must really be known -- i.e. the XG2 won't cut it,
unless I know its exact frequency...

Thanks all

On Fri, Jun 18, 2010 at 8:56 PM, Andrew Moore <[hidden email]> wrote:

> I'm performing a calibration on my K3's TXCO (5 ppm version).
> K3 is new/recent build, serial 44xx
>
> K3 owner's manual, Rev. L, page 49.
> "Method 2 (zero-beating)"
>
> I'm using an Elecraft XG2 signal generator at roughly 14.060 MHz
>
> Procedure says to enter CW mode and tune to the specified frequency (in
> this case, I don't know it, as every XG2 is probably a little different)
>
> Since I don't know the exact frequency, can I spot it with the Spot
> function, and then proceed to the REF CAL adjustment? Or is there a catch
> 22 here, as the spot function may not be accurate until the TXCO is
> calibrated?
>
> --Andrew
> NV1B
>
>

______________________________________________________________
Elecraft mailing list
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Brett Howard

Re: K3 ref osc calibration question

Perfect! The higher the frequency you use the better!

~Brett (N7MG)

On Fri, 2010-06-18 at 21:12 -0400, Andrew Moore wrote:

> I ended up using WWV at 20.0 MHz.
>
> Works great.
>
> Problem was that the freq must really be known -- i.e. the XG2 won't cut it,
> unless I know its exact frequency...
>
> Thanks all
>
>
> On Fri, Jun 18, 2010 at 8:56 PM, Andrew Moore <[hidden email]> wrote:
>
> > I'm performing a calibration on my K3's TXCO (5 ppm version).
> > K3 is new/recent build, serial 44xx
> >
> > K3 owner's manual, Rev. L, page 49.
> > "Method 2 (zero-beating)"
> >
> > I'm using an Elecraft XG2 signal generator at roughly 14.060 MHz
> >
> > Procedure says to enter CW mode and tune to the specified frequency (in
> > this case, I don't know it, as every XG2 is probably a little different)
> >
> > Since I don't know the exact frequency, can I spot it with the Spot
> > function, and then proceed to the REF CAL adjustment? Or is there a catch
> > 22 here, as the spot function may not be accurate until the TXCO is
> > calibrated?
> >
> > --Andrew
> > NV1B
> >
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

Don Wilhelm-4

Re: K3 ref osc calibration question

In reply to this post by Andrew Moore-3

Andrew,

The XG2 is controlled for its output *level*, but the frequency is
dependent on the specific crystal.
Much better to use WWV as the reference for calibration than the XG2
(unless you have previously measured the XG2 frequency with a precise
instrument).

73,
Don W3FPR

Andrew Moore wrote:

> I ended up using WWV at 20.0 MHz.
>
> Works great.
>
> Problem was that the freq must really be known -- i.e. the XG2 won't cut it,
> unless I know its exact frequency...
>
> Thanks all
>
>
>