[Elecraft] Kat500

[Mike Dodd]

On 6/21/2025 12:06 PM, Eckhart via Elecraft 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?
Broken. Or configured for only one antenna. With power applied to the 
KAT500, pressing the ANT switch should cycle it through the available 
antennas.

I believe the KAT500 utility allows you to select how many antennas are 
active. (Unfortunately, my KAT500 needs an FET replaced on the serial 
port, so I can't connect to the Utility now.)

I have only one antenna plus a dummy load, so the ANT switch cycles 
between 1 and 2.

Perhaps yours is configured for only one antenna.

73, Mike N4CF