At least two KAT500 owners have observed that the tuner faults if Tune is manually initiated with about 5 W input power. My tests with a 50 ohm dummy load show the KAT500 will always fault with 5 W input but will go to bypass without faulting if the input power is more that 6 W.
The owner's manual says:
"A tune operation begins when RF power between 7 and 100 watts is applied and the SWR is above the tuning threshold in AUTO mode, or when the TUNE switch is tapped in either AUTO or MAN modes. The RF power must be below the key line hot switching limit (see Key Line Hot Switching, above) so the KAT500 can disable the amplifier. The KAT500 will not respond to less than 7 watts of drive and over 100 watts will cause a fault condition (see Fault Conditions on page 18)."
According to this description nothing should happen if tune is attempted with 5 W. Why does the KAT500 fault? (Fault code 01 No Match).
Shouldn't the KAT500 either do nothing, as stated in the user's manual, or issue a fault code that indicates input power is too low to tune?
Andy, k3wyc
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