[Elecraft] k2 low output solution.

[Pat N8VW]

On 4 Aug 2005 22:40:19 -0400, "Pat N8VW" <k2 at linuxcolumbus.com> wrote :

> My K2 (2016) is suffering low output starting on 20 and wrapping around to
> 10 and 160 where I get little to no output.  80,40,30 are unaffected.  Rx is
> great.  Symptoms include, low output and inability to increase output beyond
> a certain level. Both symptons vary per band. When I'm less tired I'll
> produce some data.
> 
> It sounds like something in the vpwr circuit.  I checked the voltages on U8
> and found pin 10 had 5v and 11 had 0v which is opposite of what it is in the
> manual.
> 
> Thoughts anyone?
> 

After some more debugging it appears that the ksb2 is causing the problem. 
Removing it returns tx power to normal levels.  Some might say, good you
don't need ssb anyway. 

Looking at the dac u2 I find that pin 5 is at 6v when it should be ~.6v on
tx and rx.  Removing Q1 makes no difference so it appears that u2 is the
problem.  

Any thoughts on this?

Pat N8VW




> Pat N8VW  
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