APM 2.5+minimosd+telemetry - Still need 900MHz downlink?

Guys,

   I'm new here so let me ask stupid question(s)  :)

   I have APM 2.5 hooked up to 3DR telemtry (915MHz)

   Recently I got the 3DR minimosd and the split telemetry cable to be able to support both.

   Also I plan to have 5.8GHz video Rx/Tx (FPV -

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