Hi Andrea,
this posting from W2ZK (from the archives) gives the answer I hope...
73, Win DK9IP
> "If the two receivers are sharing the main
> antenna path, putting the sub receiver on a
> higher-frequency band than main may result in
> signal loss in the sub. This is due to sharing of the
> main receiver´s low-pass filters. If you select an
> incompatible band combination, the K3 briefly
> displays USE AUX as a warning. To avoid sub
> receiver signal loss, use the sub´s AUX input."
>
> 73, Ted, W2ZK
Am 06.08.2013 10:43, schrieb Andrea Abati (ik4olq):
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