There are jumpers W1 through W6 that ground various pins of MCU U1 16F877
for LED control. W1 - W2: Both open = Auto. LED control; W1 = DOT; W2 = BAR
and W3 - W6 Leave open except as required (see manual). This information is
written on the KAT100 RF Board schematic Rev. A, dated 10-30-02, sheet 2 of 2.
I have not found anywhere in the manual that says anything about these
jumpers, especially W3 - W6. Does anyone know about these jumpers?
Also, there has to be a way to bypass stray RF to keep the SWR LEDs from
going ape. Surely something can be done such as putting .01pF caps across each
LED (D103 - D112) or putting a cap between the 120 ohm resistor to ground on
each. Maybe there is a simpler mod. What small amount of stray RF I have in
the shack is not "hot" and is easily handled by all my rigs and other auto
antenna tuners. The KAT100-1 works perfectly if I can just get the display to
work right (especially on 30 meters). I would like to focus on what can be
done to the tuner and not the antenna or ground. Surely someone can come up
with a fix for this. Roy Morris W4WFB
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