[Elecraft] K2/100 Flat topping on 30m?

[kc4kgu@ENTERZONE.NET]

On Thu, 31 Oct 2002, Don Brown wrote:

> Hi
> 
> I don't know if this is your problem but I had this come up in the
> KPA100 field test to the one I built. If R26 is set too low 30 meters
> would draw a lot of current at high outputs. I was getting up around
> 25-30 amps at 100 watts out. Other bands were not as high this only
> affected 30 meters. If this is the case you may be overloading your
> power supply and the voltage is dropping. Have you monitored the
> supply while transmitting to see if it is well regulated. The R26
> problem was due to setting the power calibration at 5 watts rather
> than 50 or 100 watts. When setting the calibration that low it is easy
> to be off by a fair amount at 100 watts. R26 sets the ALC feedback so
> it can cause strange reactions if not calibrated properly.
> 
> Don Brown
> KD5NDB   
> 

Don,

I'd lean towards this not being a calibration issue.  After I finished the
KPA100, when I was seing ALC problems with SSB on _all_ bands, I sent the
rig to Gary who found that the problem was a 1/2 installed PSK mod on the
KSB2. (Don't ask me.  I installed the resisters and caps that were
supplied and they fit what the manual said.)  Anyway, Gary also aligned
the rig, set up the filters, etc.

I will take a look today though and see what I can find.  I'm wondering if
you can provide me a point of reference?  What is your R26 set to?
(measured between which two points?)

Thanks,

73 de John - KC4KGU
K2/100 #2490