[Elecraft] K2 7747 VCO alignment problem

[Dave Van Wallaghen]

Hi Keith,

Were you able to get 6v on R30 by tuning L30? Did you have to bring the 
voltage down or up by moving the windings on T5?

If you would, set the VFO to 4 MHz and do a CAL FCTR on TP1 and let me 
know what the reading is. I'm just looking for a couple of clues before 
we proceed.

73,
Dave, W8FGU


On 7/13/2020 2:52:11 PM, "Keith Hamilton" <n8cep.keith at gmail.com> wrote:

>I am having trouble with the K2 VCO alignment. I have moved the T5 windings
>and obtained 6 volts at the left end of R30. I then went on to the chart
>(table 6-1) to measure the voltages at the listed frequencies. My readings
>are ok on 80 40 and 15 meters (between 1.5 to 7.5 volts) but on 30,20,17
>,12 and 10 meters the voltage is 8.29 volts and does not change.
>
>I have checked the solder connections of T5 and the value of C72 (271). The
>diodes D21,D22,D23, D24, D25 and D26 are correctly installed. I also went
>over the solder connections of K13, K14 and K15.
>
>Now I'm stuck. Any help will be appreciated.
>
>Keioth Hamilton N8CEP
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