K2 CAL FCTR problem

[AD1AD]

Hi all,

I have a K2/100 and a K2/10.  I noticed that K2/100 is having an issue with
the frequency calibration, so I decided to fix it today.

When I set the band to 10m and connect my external GPSDO frequency counter
and the FCTR probe to TP1.  The internal counter keeps changing its
frequency while the external counter shows stable reading, so it seems that
the issue is actually with the internal FCTR.  Also, I cannot match the
external and internal reading by turning C22.  It is way off.

Any idea?  I was following the instruction from the link below;

http://www.w3fpr.com/step_1.html

Thanks,

Chris AD1AD
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[Don Wilhelm]

Chris,

Is the K2 CAL FCTR reading steady when you measure TP3 with the internal
probe?
If not, there is something wrong with either the internal probe or with
Q9 and Q10 on the control board.  Replace CB Q9 and Q10 with PN2222
transistors and see if that corrects the reading.

Once you have a steady reading, you can proceed - but not before.

73,
Don W3FPR

On 4/18/2019 6:42 PM, Chris wrote:

> Hi all,
>
> I have a K2/100 and a K2/10.  I noticed that K2/100 is having an issue with
> the frequency calibration, so I decided to fix it today.
>
> When I set the band to 10m and connect my external GPSDO frequency counter
> and the FCTR probe to TP1.  The internal counter keeps changing its
> frequency while the external counter shows stable reading, so it seems that
> the issue is actually with the internal FCTR.  Also, I cannot match the
> external and internal reading by turning C22.  It is way off.
>

______________________________________________________________
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Please help support this email list: http://www.qsl.net/donate.html