[Elecraft] K2 - Do Builder Alert 22a Upgrade ?

[Don Wilhelm]

Steve,

I would be tempted to change the resistors to see if it makes any
difference - it certainly will do no harm and has promise of correcting your
problem.  While you are inside the KPA100 shield, I would recommend that you
also check the low pass filter for 15/12/10 meters - look for the proper
number of turns on the toroids (count the turns that pass through the center
of the core) and verify that the LPF capacitor values are correct.

I have not seen this low gain behavior on 15 meters and above, but the exact
frequency depends on just how much inductance the resistors actually
possess.

73,
Don W3FPR

> -----Original Message-----
>
> I purchased a recently built K2/100 this summer and am
> gradually working my way through careful evaluations.
> Today I checked the key-down current and found some
> variations that look rather like those mentioned in
> Builder Alert #22a.
> ...
> Do you think it would be useful to make the upgrade to
> get it working as well as it can ?  Has anyone else
> observed if the current on 15m is also affected by the
> resistor problem or is the higher current I observed
> there likely due to something else ?  Has anyone got
> similar current data before and after making the
> Builder Alert 22a upgrade ?
>
> 73,
> Steve VE3SMA
>