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The TX16 was set to 250mW max power, dynamic on. The Ranger was originally set to 250mW, dynamic off, but was later changed to 1000mW, dynamic on.

Results

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What we noticed was that the TX16 was constantly at 250mW, with link quality 80-100 in close range operations (< 100m). As the drone moved away, the link quality decreased to 40-60% at 1.1km. TPower never lessened below 250mW. Moving away from airport did not help.

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All in all though, RTL always worked and we only flew within capabilities of ourselves and the drone

Flight Test Logs

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The graph above is the accumulated MAVLink Packet received/sent in the flight controller (PX6) during a flight test

The red line represents the data sent and the green is the data transmitted

• The key takeaway from this graph is that we know the telemetry RX/TX isn’t proportional. The RX:TX has a 10 times ratio difference shown in the graph

• The airport uplink/downlink bandwidth ratio is balanced and unchangeable. In the future, if the ELRS airport uplink/downlink bandwidth could be customized, then the telemetry transmission quality could be further optimized.

Hotlinks

Logs (view only - must be signed in to UW account): https://uofwaterloo-my.sharepoint.com/:f:/g/personal/uwarg_uwaterloo_ca/EnmcEWaGxHdEiYuD6xJM7XMB3XnpnPPU6S26vowZ1zjkQQ?e=gwI5j1

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