david.p.mann
Second Officer
Flight distance : 18835673 ft
United States
Offline
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All,
I tested max. range on my new P4 (23,652 feet / 4.5 miles) in an unobstructed rural area two days ago, which slightly exceeded my maximum range flight with my Inspire 1. I could fly the P4 out much farther than my P3Pro due to the P4's increased speed capability (37 mph vs. 26 mph in P mode) and the P4's higher battery capacity.
You need to set up RC antenna and DJI GO app settings properly for optimal maximum range performance:
1) Both antenna pointing straight up, parallel to one another with wide flat surfaces facing the P4. Never point the tips of the antenna at the aircraft (like pointing a gun).
2) In HD Menu, choose custom channel, observe channel interference plot for several minutes, and choose a channel with the lowest interference signal levels and with no periodic large spikes. Note: I almost always use channel 20.
3) Set HD transmission rate slider to the lowest setting (far left), which is 4 Mbps. This will increase max HD Link range and insure stable, stutter-free video.
4) Change your body position, or maintain it, as needed to keep the antenna facing the aircraft throughout the flight.
5) I use one simple, inexpensive ($30), non-permanent antenna mod (no RC wiring mods required) to increase signal strength - a well-made aluminum parabolic reflector purchased from an eBay vendor, which I slip over the pair of upright antenna. The curved aluminum reflectors will be BEHIND the antennas and facing the P4 (like a satellite dish faces the satellite from which it is receiving programming).
6) Remember - there must be unhindered LOS between the antennas and the P4. So, no trees, buildings, fences, people, etc. in front of you blocking signals. Even distant obstructions can interfere with signal transmission when P4 is far away. Flying at higher elevations (under 400 feet) ensures you better signal strength. I flew out 21,000 feet at 250 feet elevation and started to lose HD signal strength. Increasing altitude to 350 feet restored full HD signal strength.
7) Flying in P-mode with obstacle avoidance turned off will allow you fly P4 at up 37 mph with full GPS functionality (like P-GPS mode on P3Pro). This will increase your maximum range.
8) Be sure to continuously monitor your battery levels, and leave sufficient battery capacity to return safely home. With fully charged battery, that had been cycled twice, I turned around at 62% and barely made it home with 8% battery left. That's cutting it too close.
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