K2 Alignment and Test, Part II results with missing resistor

[Bob G.]

After successfully completing Part II of the receiver alignment and test I look back and see where I skipped R29 (10k) on the RF board bottom side.  I installed R29's resistor at R19 instead.  So R29 was empty and R19 held a 10k instead of 2.7k.  Your most excellent method of orienting the resistors in a strip raised the red flag for me when I started installing resistors again.  So much for my careful review and inspection.  The Part II alignment came out excellent.  Do these two errors affect the alignment results such that I need to go back and do the session over again?  I hope it did not affect the 4 MHz Oscillator Calibration - I worked hard to find and use an external counter and hope not to re-do it.  Thanks for any thoughts.

Bob Gordon
KE5WZK
K2 S/N 6667

[Don Wilhelm-4]

Bob,

Those 2 resistors are not likely to change any of the alignments
significantly, but do swap them because they could change the stability
of the VFO.

With respect to the 4 MHz Reference alignment, I would encourage you to
re-do that anyway after the K2 is complete.  Your attempts to set it at
exactly 4 MHz, while good, do not assure you of accurate dial
calibration.  After you have everything together and working, I
encourage you to do the steps in the K2 Dial Calibration article on my
website www.w3fpr.com.  You will not need an external frequency counter
at all, but you will want to use Spectrogram or some other audio
spectrum analyzer to get it "just right" and align your filters as well
(an important part of the overall process).  The settings in the manual
will get your filters 'in the ballpark', but they do need to be
refined.  Wait until you have the KSB2 and the K160RX and the K60XV
options installed if indeed you will be installing those options.

73,
Don W3FPR

Bob G. wrote:

> After successfully completing Part II of the receiver alignment and test I
> look back and see where I skipped R29 (10k) on the RF board bottom side.  I
> installed R29's resistor at R19 instead.  So R29 was empty and R19 held a
> 10k instead of 2.7k.  Your most excellent method of orienting the resistors
> in a strip raised the red flag for me when I started installing resistors
> again.  So much for my careful review and inspection.  The Part II alignment
> came out excellent.  Do these two errors affect the alignment results such
> that I need to go back and do the session over again?  I hope it did not
> affect the 4 MHz Oscillator Calibration - I worked hard to find and use an
> external counter and hope not to re-do it.  Thanks for any thoughts.
>
> Bob Gordon
> KE5WZK
> K2 S/N 6667
>  
>  

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