Power level on 3DR radio

Good day all

The first 2 phases of my second drone is complete. I now have:

F450 frame
2312 motors
Bl-Heli32 (40A) ESC
9450S props
RXSR Frsky receiver
Pixhawk 2.4.8 ( running APM copter V3.5.5 )
M8N GPS
CADDX Turbo SDR1 1200TVL camera
TBS Unify Pro 5G8 HV Race (MMCX) VTX
MiniOSD for Mavlink OSD on FPV
FPV running on separate PDB from 3S

I now want to add my 433 MHz telemetry to Mission-Planner.

I have purchsed my 433MHz 3DR radios (500mW)  and I am busy configuring that.

WHat I did see in the Sik radio tab on mission planner, is that the TX-level can only go to

20. This means 20dBm which is 100mW. 500mW is 27 dBm. 

Can anyone offer some advise please ? I would like to use the 500mW to give me more range.

Best regards

John

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