[Elecraft] K2 build - VCO control voltage 0 volts

[Harry Stone]

Don,
     I know this isn't exactly your first rodeo, but that's still pretty
impressive.  I have the wrong component installed at C73, I have a 4
<point> 7 pF instead of a 47 pF.

Bravo!

thanx,
harry



On Saturday, October 26, 2013, Don Wilhelm wrote:

> Harry,
>
> The thing in the VFO Range Select area that is common between 40, 30 and
> 15 meters is C73,
> Check its value - it should be 47 pF (marked 470).
>
> A low voltage at R30 indicates that there is not sufficient capacity in
> the tuned circuit and the PLL/VCO is trying to increase the value of the
> total capacity.  That means if C73 is the correct value, check its
> soldering and the soldering of relay K13 pin 8.
>
> CAL PLL depends on having the 40 meter frequency range correct, so you
> will not be able to do that procedure until you have the R30 voltage in
> range on 40 meters (info 232 means the frequency read by the MCU is not
> correct (yes there are other possible causes of info 232).  The alignment
> steps are sequential, so if one does not give correct results, you cannot
> skip to the next one without encountering problems.
>
> 73,
> Don W3FPR
>
>
> On 10/26/2013 6:13 PM, Harry Stone wrote:
>
>> My VCO control voltage is zero on 40,30, and 15 meters.  All other bands
>> are within the normal range, all tests prior to these measurements passed.
>>   When I try to run CAL PLL, I get info 232 even though I am on 40 meters.
>>
>> What should I check first?
>>
>>
>>
>

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