[Elecraft] VCO Alignment

[Don Wilhelm]

Steve,

Check the number of red wire turns on T5 - count the wire as it goes
threough the center of the core - counting only the outside turns can
produce a numer that is one turn less than the proper number.  This sounds
like the sitation that occurs when there is one extra turn on T5.

If you find the turns on T5 are indeed correct, the next most probable area
to be investigated is the capacitors in the VFO Range Select area.

If you have installed the rework eliminators, be very certain you follow the
instructions for the rework eliminators carefully - the capacitors for the
VFO Range select area chnge with these instructions.

73,
Don W3FPR

-----Original Message-----

I ordered K2 #5329 in January, and was just able to start on it a few weeks
ago.  After a short break I'm back at it and this afternoon got to the
Alignment and Test, Part II.  All was well until I got to VCO Alignment on
page 61.  At first I was not able to adjust L30 and get the VCO voltage to
6.0 volts.  All I could get was 7.99 volts.  After reading the archives, I
spread the turns on T5, and sure enough, I could get 6.0 volts at R30.  But,
it seems after adjusting, it drifts up slowly.  So, I decided to go through
the bands and see what I got.  At 3500 Khz, it was a little low, and
everything 7300 and above is at 7.99 volts.  I've looked the board over
again and again, and can't see anything wrong.  Whenever I check R30 at 4000
KHz, it will be off 6.0 volts, when I adjust it back, it continues to drift,
and everything above 7300 is pegged at 7.99 volts.

I hope someone has some suggestions, because I'm stumped.

Thanks in advance, Steve - WD7M

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