TheMann58
Second Officer
Flight distance : 18669501 ft
United States
Offline
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Supercaliber Posted at 2017-9-22 09:41
Ok, 5.8Ghz, thats really interesting..with clear line of sight your getting 5+ miles..I've always believed that 5.8GHz didn't help with distance as it does with 2.4..How about more dense terrain?..Are you getting video issues?..The problem I have with all this is that Ocusync seems much more reliable for transmission/connection than Lightbridge..My Mavic stays "locked" solid (in 2.4) until about the 2.5 mile mark in my area then it gently starts to flicker, if that makes sense..I've never disconnected from my Mavic completely but have with both I1 and P4P..I have little trust with both..Theres no doubt in my mind that Ocusync is a better technology.
Unfortunately there was some incorrect information disseminated on this forum about 5.8 GHz not being useful at long distances. That is completely bogus. In rural areas with little to no signal interference and no signal line-of-sight obstructions (trees, buildings, etc.) both 2.4 GHz and 5.8 GHz frequencies are solid at distances up to 4+ miles. In more urban areas, I have difficulty getting past 8,000 feet in 2.4 GHz mode due to interference from WiFi routers, baby monitors, wireless phones, etc. on almost all available 2.4 GHz channels. But I have successfully flown 20,000+ feet following green belts between neighborhoods with thousands of homes in 5.8 GHz mode. Apparently, 5.8 GHz internet routers either don't penetrate roofs or they are very limited in range, so they don't interfere with the P4Pro in 5.8 GHz mode at elevations of 150+ feet AGL. I rarely see ANY signal interference on ANY of the 32 available 5.8 GHz channels on the Signal Interfernce chart on the HD tab of the DJI GO 4 app and that allows me to safely choose AUTO channel mode in 5.8 GHz mode. This use of AUTO 5.8 GHz HD mode has the added benefit of providing the highest resolution, highest bit-rate Live video transmission between the P4Pro and the RC. In 2.4 GHz mode, unfortunately, for long-distance flying it is essential to choose a manual channel with the lowest interference signal activity as indicated on the signal level chart in the HD tab AND also to choose the lowest (4 Mbps) signal transmission rate.
With regard to foilage penetration, in my experience, at distances greater than 3,000 feet, even a single tree hundreds of yards away in the signal line-of-sight can cause loss of signal in either 2.4 GHz or 5.8 GHz HD mode.
For successful long distance flights you MUST keep your antenna upright, parallel to one another with wide, flat sides aimed precisely at the distant aircraft. Even a momentary tilt in RC position towards the ground because your hands got tired can sever the signal connection. Make sure you set your RTH height above the highest possible landscape item in the return flight path - that includes cell towers.
Also, an inexpensive aluminum parabolic refector (I use $30 Windsurfer type) is HIGHLY recommended for maintaining 4-5 bars RC and HD signal strength out to 25,000 feet distances. No fancy, expensive, warranty-voiding antenna mods are required to your RC. These antenna mods could possibly provide better foilage penetration, but are unneeded for obstruction-free long-distance flying. |
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