[Elecraft] K2 build - VCO control voltage 0 volts

[Harry Stone]

Well I spoke too soon.  I replaced that capacitor and now I have 0 volts on
every band.   Any thoughts?

thanx,
harry




On Saturday, October 26, 2013, Harry Stone wrote:

> 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?
>>>
>>>
>>>
>>
>
> --
> Have old memories and young hopes.
>


-- 
Have old memories and young hopes.