[Elecraft] K2 VCO Alignment only 0.02V @ R30

JeremyJones jjones9527 at gmail.com
Sat Feb 2 14:48:30 EST 2013


Hi Don,

I set C22 to midway. 
PLL @ TP3 is 12099.12 - 12086.32. 
T5 is a yellow core, wound with 15 turns red and 4 green. I had to bring it
down to 15 turns as recommended by Gary to get 8253.86khz @ TP1 when tuned
to 4000.10 for the VCO test.  It was around 7694.39 with 16 turns. 
L30 is the correct part, and all diodes have been checked to ensure the
correct part and placement. 
Soldering has been checked. 
Verified C67, C65, C64, C68, D13, Q18 for value and orientation. 
Relays click when changing bands. 

Still getting the following readings. 
3500 = 8248.42
7000 = 12010.78
10100 = 14157.67
14000 = 16976.67
18068 = 18878.23
21000 = 15211.55
24890 = 16977.38
28000 = 18878.84

I am at a loss for what to look for next. Everything seems to check out, but
my readings are still off. Anyway I can try to isolate a faulty component?



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