The early HB core DI units transmitted 200kHz455kHz for 2d Sonar ... I would assume the xi3 Sonar is 200kHz only ...
Some of these units also could use the DI piezo for depth ...
Under the Setup tab set the User Mode to Advanced ...
Then look under the Sonar tab for this : some DI units have this - some don’t ...
Select the 2d element for digital depth ...
Then also under the Sonar tab under Beam Frequency - select 200kHz only ...
This should force the HB to transmit 200kHz to the xi3 Sonar piezo and use that data for digital depth ...
Rickie