[Elecraft] KPA100 Upgrade and KAT100 Problem

[Don Wilhelm]

John,

Let's try that measurement of U3 pins 6 and 7 again, this time with the
KAT100 in CAL mode and after pressing TUNE.  Those pins should read zero
volts during transmit when th epower is set for 11 watts or more, but should
go to a higher voltage if the power is less than 10 watts.

If that is not happening, then your wattmeter is not being scaled for both
high and low power, and if the SWR is anything other than a true 1:1, the
number of LEDs lit on the tuner will increase as the power is increased.

73,
Don W3FPR

> -----Original Message-----
> > Pins 6 and 7 of U3 must go to a low level (to scale the
> wattmeter readings)
> > when high power is active.
> The Logic selection on my DMM shows LO between ground and pins 6 and 7
> of U3 at all times, both high and low power.
>