[Elecraft] KAT100 LEDs Gone Wild

[Unifiedtx at aol.com]

I thought that installing MCU1.05 there would be ample RF sampling rates  
taken to avoid erratic LED displays.  The updated firmware seems not to be  the 
solution.
With a 50 ohm dummy load on the KAT100 output only the leftmost LED lights  
up and K2 SWR is 1:1 regardless of power or band in use.  With the Carolina  
Windom 80 attached to the KAT100 output and a Bird 43 wattmeter between the K2  
output and KAT100 input, I found the reflected power stayed at zero and the  
forward power stayed at max (regardless of band or power setting) while the  
KAT100 LEDs and K2 SWR reading were going wild.  The wildest LED and SWR  
activity occurs on 30 meters but does not occur on all bands. 
I have already removed the white wire from pin 7 of the K2 end of the IO  
port and put a .01 pF cap from the white wire to the bare wire on pin 1.
My shack is on the second floor (over my garage) and I have tried to be as  
attentive to grounding as possible.  I use a common grounding point that  
attaches to a 1/2 " copper pipe (used only for grounding) that goes down approx  10 
feet to an eight foot buried grounding rod.  I believe the K2 erratic  SWR 
activity will stop when the KAT100 LED stray RF problem has been  eliminated.  
Has anyone made any changes or done any bypassing inside the  KAT100 to 
eliminate stray RF and tame the LED display?  Roy Morris   W4WFB