[Elecraft] Help - Fluctuating output power ok K2

[Don Wilhelm]

Dean,

First I must ask - have you done anything between the keyup and the next
keydown?

For instance, if you change bands, the K2 must reset its power sensing
circuits to determine the new value of ALC that must be applied to maintain
the requested power output.  This is normal.

OTOH, if you are experiencing this power fluctuation when no buttons have
been pushed (or knobs moved) on the K2, then you may have a problem with
either the power sensing circuit or the ALC circuit - check the soldering
first.

73,
Don W3FPR

> -----Original Message-----
>
> I just finished SN 5319 a few days ago and all is working
> perfectly except that the output power fluctuates. The radio is
> stock with no options. It will not fluctuate while the radio is
> transmitting a solid carrier, but as soon as you unkey and start
> sending a carrier again, the power will drop or jump several
> watts.  It is as if the power control was changed but it was not.
> It does it on all bands. It does it into a dummy load or an
> antenna. The current limiter has been ruled out because it is set
> for 3.5 and the current is not exceeding 3.0. There is not
> voltage drop on the power supply so I also ruled out a power
> supply issue. it is just as if the ALC is kicking in and turning
> down the power randomly. When the output power drops, the current
> also drops accordingly.
>
> The radio seems to work perfectly otherwise.
>
> Your suggestions are greatly appreciated.
>
> Dean
> KG7MZ
>