I have recently completed phase III build of my K2 and started the alignment process.
> A couple of problems developed during the alignment so I went back
> and started re-checking phases I and II resistance and voltage checks.
> During the initial construction of these two phases all of the resistance
> and voltage checks were within specified ranges. This time the VCO
> voltages were off. I am able to get the 6vdc at R30 with no problem. It
> was fully adjustable to that value at 1 turn from the top of L30. The voltages on 80
meters did drop from 6 vdc at 4ooo hz to 1.7 vdc at 3500 hz. When checking the voltages on
> the other bands the voltage was a solid 8.3 vdc at the low and upper ends of the bands
and would not vary when moving the vfo. The display on the dmm did show the proper
voltages while moving the vfo but then went back to 8.3 vdc when I stopped moving the dial. Adjusting the voltage
at L30 did not change the voltage from 8.3 vdc. When I switched back to 80 meters I was able to
adjust back to 6vdc as before. Anybody have any suggestions? I have searched the archives and found
> nothing on this subject. I have checked the K13, K14, and K15 relay contacts and they
are working normally. Varactors D19 - D20 are not installed. The varactors were
visibly checked by number and physical size. Could I have a problem with the Z1 shaft encoder
or the U3 chip it drives?
Any feedback will be greatly appreciated.
Dan
af4lb
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