[Elecraft] K2 low power

[Don Wilhelm]

Conway,

Does the same thing occur on all bands?  If so, re-check the turns on T4 
and be certain it is not mounted backwards - the 'links' go only from 
the front of the core to the back (each one goes through only one hole).
If the low power and high current are only on 160, 80, 40, 20, 15, and 
10 meters, then check the number of turns on the Low Pass Filter 
toroids.  Count the number of times the wire passes through the center 
of the core.  On a toroid, a straight wire through the center is one 
turn, a complete wrap around the core id two turns.

There are a few other possibilities, but they are less frequent and more 
obscure than the ones I have mentioned.

If you feel Q6 is too warm, increase the value of R46 to 330 ohms (you 
could do that arbitrarily and it will cause no problem).

73,
Don W3FPR

Conway Yee wrote:
> I have found low power on initial transmitter tests of my K2 construction.
> I am unable to get above about 1 Watt before I get High Current.
>
> I can not find any obvious error in winding T1-4. I reflowed all the
> joints involved in the toroids.
>
> Q6 is warm.  I am unable to assess the temperature of Q7 or Q8 because of
> the heatsink.
>
> No errors noted in the resistors in measuring power output.
>
> tnx.
> Conway Yee, N2JWQ
>   
>