K2:CAL S Hi Problem

[Clark Macaulay KE4RQ]

Just finished Part 2 of my K2.  All tests worked fine, but now I can't get the Cal S functions to work correctly.  Cal S Lo works ok, but I can't get Cal S hi to turn off (yes, I have the RF gain fully CCW).  When I leave Cal S Hi at the maximum value I can (display is 000, and the far fight segment is still lit, when going back to the normal display, the segment at S3 is now lit.  Rotatating the RF gain does reduce the volume and move the segment up scale.
   
  I'm sure this worked fine when testing the control/front panel boards by themselves, so I can't seem to find out what changed.  Any ideas?
   
  73 de Clark ke4rq
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[Don Wilhelm-3]

Clark,

The most likely reason is that your filters are currently not set
correctly for single signal reception and allows the BFO to leak some
signal into the IF passband.

I suggest you wait until you have all bands working and after you have
done an alignment of the BFO frequencies (and filter widths as you
desire), then you can correct it if there is still a problem.

For now, simply set CAL S Lo about 185 and CAL S Hi about 018.  After
you do the final filter alignment (using Spectrogram is best and
easiest), then do a final pass on setting CAL S Lo and CAL S Hi.  You
may even want to wait until you have completed the KSB2 and installed it
before setting CAL S Hi and CAL S Lo critically.

73,
Don W3FPR

Clark Macaulay wrote:
> Just finished Part 2 of my K2.  All tests worked fine, but now I can't get the Cal S functions to work correctly.  Cal S Lo works ok, but I can't get Cal S hi to turn off (yes, I have the RF gain fully CCW).  When I leave Cal S Hi at the maximum value I can (display is 000, and the far fight segment is still lit, when going back to the normal display, the segment at S3 is now lit.  Rotatating the RF gain does reduce the volume and move the segment up scale.
>    
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