My K3 has the KAT3 and I am using the external PR6 via the RX ant. On 6 M if I have the antenna on Port 2 everything works correctly as the signal goes up in strength when I select RX bringing in the PR6. If the antenna is on Port 1 I get the opposite effect. The signal goes down at least 4 or 5 S units when selecting RX to bring in the PR6. Any suggestions?