[Elecraft] K2 kit building problem

[Don Wilhelm]

Gordon,

It is doubtful (but possible) that Q6 is bad.  Did it overheat when you 
powered up? - if it did, you would most likely have seen a wisp of smoke.

How large is the signal at the base of Q6 when you have 800mV P-P on the 
collector of Q5?

The base voltage on Q6 is higher than normal, it should be around 1.1 
volts.  I would suggest you check all components in the base circuit of 
Q6 first.

73,
Don W3FPR

On 3/4/2018 2:26 PM, Gordon LaPoint wrote:
> I'm building a K2 kit and I have a problem.  I'm starting the Alignment 
> and Test, Part III on page 77-78.   I have no rf out.  I have followed 
> the rf through the tx chain and have a good signal at (RF board) Q5 
> collector (800mv P-P) using a 400Mhz scope.  I have a signal on Q6 base, 
> but nothing on the collector.  The DC voltage (in TX) at Q6 is 12.0 
> Collector, 1.8VDC base and 0 on emitter.  I don't see anything wrong DC 
> wise, is it likley that Q6 is bad?  What else should I look for?  With 
> the radio off the R at Q6 emitter to ground is 1.8ohms, that looks 
> normal, so I don't have any current flow in Q6, it looks like.