TheMann58
Second Officer
Flight distance : 18835673 ft
United States
Offline
|
JayOne,
I have seen many state, as you did, that 2.4 GHz is best for long distance. Well, this may be true in some environments, and I don't know what those are, but for me, and others, 5.8 GHz in AUTO mode provides consistently the LONGEST RANGE and the BEST VIDEO QUALITY. With clear signal line of sight between the P4Pro RC and the P4Pro Aircraft flying in both rural, open countryside as well as in urban settings with hundreds/thousands of homes with WiFi, baby monitors, wireless phone, etc., etc., I can fly out 20,000 to as much as 25,000 feet using 5.8 GHz AUTO mode and still have 4-5 bars of both RC signal and HD signal! In fact, I only turn around because I have reached 50-55% battery level and must turn around in order to make it home safely. In some of these areas, particularly the urban areas, I cannot get further than 8,000 feet using 2.4 GHz before I lose signal.
Some tips:
1) If you do wish to use 2.4 GHz, go to HD tab in the DJI GO 4 app, put it in Custom mode, and watch the signal levels on all available channels. Then choose the channel with preferably zero signal level or the least amount of signal activity. Then choose the lowest signal transmission rate (4 Mbps).
2) When using 5.8 GHz mode, you can also observe the signal level display to see if there is any interference on any of the channels. If you are in area that has strong 5.8 GHz signal activity, then choose Custom and pick a channel with zero signal level activity.
3) When using 5.8 GHz mode, if you check the signal levels of all available channels and there is little to no signal interference on most or all of the channel (which is the normal situation for me), then chose 5.8 GHz AUTO mode and you are golden. I have been consistently impressed and amazed that I can fly out 20,000+ feet in 5.8 GHz mode and still get high-quality live video with very few glitches, no green screens, and high refresh rates on the live video on my tablet (an iPad Air 2).
4) Regardless of which signal mode - 2.4 or 5.8 GHz - that you use, if you plan to fly out further than a couple thousand feet, then I strongly encourage you to buy a Windsurfer type aluminum parabolic reflector and slip it over your two antenna. I ALWAYS fly with a parabolic reflector slipped over the antenna of my P3Pro, P4, and P4Pro when flying out further than 1000 feet. You can buy these from a number of vendors on eBay for around $30. Cheap investment - doesn't void your warranty - tremendous bang for the buck.
5) To maximize signal strength and video performance with the P4Pro at long distance (greater than 1000 feet) from the RC, you MUST keep the two antenna vertical (pointing straight up to the sky), parallel to one another, with the wide, flat sides facing the P4Pro AT ALL TIMES. If your P4Pro is at distance and you tilt your RC down, left or right for even a second, you risk losing signal connection and the P4Pro will go into RTH after a few seconds. You can often regain connection to the aircraft if this happens by pointing the antenna again in the correct direction and being patient - sometimes it takes 30-90 seconds to regain connection at long distances (and then cancel the RTH, if you wish). BUT, it's best to avoid losing signal connection by being mindful of your body and RC position throughout the entire long distance flight.
6) I do not wish to antagonize any Android tablet users, but in my experience, hands down the most reliable, stable, high-quality live video and rock solid, crash-free DJI GO 4 app experience can be achieved using a high-end Apple iOS iPad. My iPad Mini 3 has no longer got a beefy enough CPU and graphics chip to give me stable video for long periods, but my iPad Air 2 has NEVER given me a problem. I suspect the Apple iPad Pros (last year's model or this year's 10.5" model that was just released) will also be perfect, but I have not tested them personally.
7) Finally, it's now summer, and temperatures in many areas are approaching 90-100 degrees. ALL mobile devices WILL OVERHEAT and get unstable in these temperatures, ESPECIALLY if tablet screen is exposed to direct sunlight - even for 30 seconds. Most devices, including Apple iPads are only rated for a maximum operating temperature of 95 degrees F. Tablet temperature can rapidly exceed 115 F (or more) if the screen is exposed to direct sunlight for less than a minute. The first signs of high-temperature instability look a lot like the green screen, stuttering video that I'm starting to see more and more complaints about. This is my third summer flying Phantom aircraft and I know from experience, that this will be a problem for many as summer temperature continue to rise.
SO, KEEP YOUR TABLET PROTECTED BY A SUNSHADE. DO NOT STAND, IF AT ALL POSSIBLE, WITH YOUR BACK TO THE SUN IN MORNING OR AFTERNOON BECAUSE DIRECT SUNLIGHT WILL STILL BE HITTING YOUR TABLET SCREEN.
Finally, if your tablet overheats, and even shuts down/reboots, DO NOT PANIC. Your RC is still controlling your aircraft and you can either manually pilot it home with the RC sticks or press and hold the RTH button on the RC to bring it home automatically. Also, be aware that your tablet overheating and crashing will NOT automatically trigger a RTH if the RC still has good signal connection to the P4Pro. With no stick input, in this situation, it will just hover in place until you initiate a RTH or the battery level drops to level it triggers a SMART RTH.
(Jeez, I've written a friggin book here. Hope it's useful to some of you.)
|
|