+ AA6YQ comments below
Its the antenna switch in my Palstar 1k-la RF Amp.
+ The user manual for that amp
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+ is confusing, as it describes different External Data Connectors on page 10 and page 11.
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+ I don't see any mention of an "antenna switch".
+ Likely, you can enable the amp to follow your transceiver's frequency by using Commander's Secondary CAT Port configured to use the Kenwood protocol. I'm basing this on the "RS-232 Band Control (Kenwood) pinout" table shown on page 10 of the user manual.
https://www.dxlabsuite.com/dxlabwiki/ControlDeviceViaSecondaryCATPort
+ I once asked the owner of Palstar for documentation describing his automatic tuner's control protocol so that I could extend Commander to support it, and was told to pound sand. Not my favorite company...
? ? ? ? ?73,
? ? ? ? ? ? ? ? Dave, AA6YQ
