Yes, that input should be a 5 volts, there is a pullup resistor on it.
Since it is in the range of 3 to 4 volts, either the pullup resistor is
damaged (not likely) or the input on the IC inside the K3 is dragging
the voltage down.
73,
Don W3FPR
On 3/1/2014 4:01 PM, Pfizenmayer wrote:
Sleep deprived - has been pointed out pin 1 is FSK and 4 is PTT - yep - I
checked the right pins - just transposed numbers when typed , pin 1 just drifts
up . Pretty sure it should be pretty solid 5 open circuit.
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