[Elecraft] K3/100 input voltage and TX IMD

[Nick-WA5BDU]

I did my own little unscientific IMD check yesterday.  I connected the 
K3 to my Cantenna and monitored with my IC-706IIg on the same desk and 
same power supply.  I used a bit of wire in the 706's antenna terminal 
sufficient to give an S9 or higher received signal strength.  Had the K3 
at 100 watts and mic gain to hit 100W on peaks.  Then tuned up and down 
from my signal several kHz each way on the 706 listening for splatter as 
I transmitted.  Didn't hear any, unless it was faint.  Of course, I hear 
my signal changing in pitch and diminishing in strength as I moved the 
receiver away, but I hope I know what that sounds like.

I did this on 40 meters and 15 meters, and with CMP on and off.  I did 
it again at 50 and 80 watts and didn't notice any difference.  Also 
checked at 13.8V and 14.5V supply voltage and didn't notice a difference.

I checked my voltage drop on the K3's internal meter.  From receive to 
100 watts CW key down, I got 0.7 VDC drop.  I note that the MFJ switcher 
provided 0.19V of that.  Today I soldered my crimped lugs at the P/S end 
and noticed no difference when I did the measurement check again.

73-Nick, WA5BDU