[Elecraft] Alignement and Test part II - VCO Test not reading 8 to 10 MHZ range.

[VA2EK]

Don, 

Once again you have pin pointed me to the right direction.  C72 was the
issue, I had put in a 27uF instead of a 270uF capacitor.  Changed over the
capacitor and everything became normal.  Don't know if we can attribute this
to being a rookie in building kits, in any case I will make changes to my
double-triple check procedure while building.

Went through all the Part II alignment and EVERYTHING is within specs.

I can even hear CW and phone on 40M.  What a great feeling!  

Even with its challenges I'm enjoying my K2 building experience!

Thank you for your prompt assistance Don, it is very much appreciated,
especially over the weekend.

Best regards, hope to someday shake your hand and thank you personally.

73's

Mario - VA2EK.


---------------------------------

Mario, 

I assume "no voltage" is equal to zero volts, which is a perfectly valid 
voltage measurement.  I know it is a subtle point, but such clarity is 
important for successful troubleshooting. 

A zero volts indication at the left end of R30 is an indication that the 
VCO/PLL circuits are trying to create more capacity in the varactors 
because the frequency is too high. 

The first thing to do is check the number of red turns on T5 - it must 
be 16. 
Then check the value of C72 - it must be 270 pF (marked 271). 
Check the soldering of C72, T5, and relays K13, K14 and K15. Re-flow the 
solder with a hot iron (750 degF). 

Additional checks -- do you have 4 volts at U6 pin 5?  If not, you have 
a problem with the Thermistor Board (likely a solder bridge). You can 
reach the solder side of the Thermistor board by removing the Control 
Board and Front Panel. 

If those steps do not fix it, ask again and we can offer more 
measurements and suggestions. 

BTW: If you are posting from Nabble, include some of this post in your 
reply text so those of us who are receiving the direct reflector posts 
have some reference for what has gone on before.  It seems Nabble strips 
out the prior post history assuming that everyone uses the Nabble 
"forum" - that is a bad assumption.  Copy a part of the previous post in 
your reply so we have a reference. 

73, 
Don W3FPR 


On 1/11/2014 3:13 PM, VA2EK wrote: 
> On K2 serial 7168, I measure in the 12,000 MHz range.  If this can be of 
> useful info, in the VFO Alignement Test, there is no voltage at R30 and
> the 
> R30 value doesn't change upon L30 position. 
> 
> Thanks, 
> 
> Mario -VA2EK. 
> 

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-----
Thanks,

73's

Mario.
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