Connecting telemetry to the Mission Planner

Hello everyone, I am new here, I assemble DJI F450 with pixhawk 2.4.8 controller first time. When I try to install telemetry 433mhz(cp210x), mission planner does not see the remote device. It only shows local.

Then when I press button “Connect”, it shows “No Heartbeat Packets Received”

Can anyone help me? How can i solve it?

First: It has nothing to do with Mission Planner

Can be a faulty telemetry radio, or a wrong configuration. Try configure both radio separately to the same parameters (connect directly each of them to the PC).
IF they known to be configured correctly, and you see solid green led on both radio, then it is possible that they are too close to each other. Try to get some distance between them.

I’m facing same problem