Radio control is not active or turned on

@Bradley_Scott wrote:

I am in the process of setting up my Navio 2 board. I have managed to connect with APM Planner and configure the compass, accelerometers, etc
I am using this 3dr PPM encoder: https://store.3dr.com/products/ppm-encoder

I have connected the encoder to the PPM pins on my Navio 2 and the Rx. The encoder itself looks to be working fine. The LEDs indicate that it picks up signals from the Tx when I turn it on, and the blink rate on the encoder increases as I throttle up as it should.
So the signals from Tx -> Rx -> Encoder seem to be working as they should

However, when I connect to APM it says "Radio control is not active or turned on". So the Navio doesnt seem to be receiving any radio signals.
I have on occassion seen my radio signals display at neutral values on APM Planner (mid throttle, pitch, yaw, etc) and as soon as I turn on my radio Tx the signals seem to drop out to null or zero values.

I initially was powering my Navio through The Pi's USB power. But I decided to instead try and power it using a battery via the power module. I get the same behaviour.
I also tried connecting using Mission Planner as some threads in this forum suggested APM Planner was the problem. But I receive a similar error using Mission Planner too.

Does anyone have any tips about what might be happening?

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