Looks like the Kenwood switches high during transmit and the KPA500
requires a low for transmit. KPA500 specs in my manual say +5V max, open
circuit on receive, closed to ground on transmit. My old KPA500 manual
doesn't show Kenwood interconnections. Only the K3, Yaesu and Icom.
Yup, ya need to supply a low to the amp.
Joe ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
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