It’s possible to lock out antenna ports with the KAT500 utility so you can’t change to them so that they can’t be transmitted to when there’s no antenna connected. I suspect they’ve been excluded in this fashion. They can be reset in the utility to open them up.
73, Adrian K7RJS > On Jun 21, 2025, at 9:07 AM, Eckhart via Elecraft <[email protected]> > wrote: > > Hello > > I aquired a used KAT500 for use with ma K3S/KPA500. > Even after a software update the tuner will not allow a changing of the > antenna. It stays on ant1. > The same, when operating from the utility. > Any ideas what this may be? > > Eckhart Neumann > DK2LJ > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
