Why do we call this "wireless?" 73,
Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County Jack Brindle via Elecraft wrote on 3/31/2022 9:47 PM:
OK, now this is starting to make sense. Jim’s K3 has a KIO3, not the newer KIO3B. On the older board, the BAND and PTT lines have pullup resistors to the Vcc rail. When the K3 is powered off, that Vcc rail is at 0 volts, which means the pull-ups are now pulldowns. Thus the K3 is inadvertently keying the KPA500. If the KPA detects that the KEY input is low when the user tries to put it into OPER mode, the amplifier will reject the request and stay in STBY. Thus the condition that Jim is seeing. Try disconnecting the AUXIO cable from the KPA500 and see if it now operates properly. You may actually need to connect the KAT500 to the KPA using both the AuxIO and phono cables (for PTT) depending on which radio is in use. The main issue is how to disconnect the PTT signal from the K3 to the KPA when using the Icom. Otherwise you may be able to leave the AuxIO cable connected. I know that Fred Cady discussed sharing a KPA between two radios in his book, but has anyone solved this situation - one radio is a K3, the other something else? 73, Jack, W6FB
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