[Elecraft] K2 build - VCO control voltage 0 volts

[Don Wilhelm]

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?
>
>