[Elecraft] [K2] HiCur problem

[Don Wilhelm]

  Brian,

HiCur messages combined with Low Power output is usually associated with 
a problem with T4 or the Low Pass Filter.

Since it did work before (I know it did last November). it may be that 
you have a PA transistor failure.  Such a PA transistor failure could be 
due to operating the K2 into a high SWR load (or an open circuit - no 
antenna, etc.).

If I were to guess, I would say that you have higher than normal voltage 
on the base of Q7 and Q8.  Measure it during transmit (TUNE will do).  
If it is higher than 0.63 volts, then that is the cause.  The problem 
could be due to Q7, Q8, Q11 or Q13.  The K2PAKIT contains replacements 
for all 4 and if you have bad PA transistors, I would suggest replacing 
them all.

73,
Don W3FPR

On 2/12/2011 8:00 PM, Brian Denley wrote:
> I am getting hi current message into a 50 ohm dummy load for any setting
> over 1 watt (even 1 watt is drawing well over 3 amps).  If I try to set the
> power output higher, the K2 clicks off and resets.  In previous tests, I
> could put 10 watts into the same load with out any problem.  Any ideas on
> where to look would be appreciated.
> Thanks
> Brian
> KB1VBF
>