I am still preparing the testbeds for upcoming analysis. But I had to run a quick test that is not scientific, but rather a quick litmus check on antenna types that
@aczi asked about until I can produce detailed reports.
I am currently using a dual element (two N type antenna connectors) 2.4 gHz 30x30 degree panel antenna. One element is vertically polarized and the second is horizontally polarized. There is little documentation I can find on the mavic remote and aircraft wireless systems, but we can infer and make educated guesses on behavior that closely mimics open commercial systems.
I would suspect that the remote and aircraft have vertically polarized antennas and you will see below some evidence to support this. You might ask why does your antenna have differing polarization for each element? Well, in commercial Wi-Fi and other related systems, things like diversity and multiple input technologies can benefit from the differences of the two signals and make calculations to digitally improve data throughput.
I setup a simple test course to run identical paths and identical hardware. The mavic remote has two antenna elements. With the remote in your hands in normal flying position, I will refer to the left and right radio antenna connectors.
Based on scope analysis in prior testing, the left radio connector is configured to TX/RX (transmit and receive). The right radio connector is RX only. I can infer that the mavic employs some kind of technology to improve the overall RX performance by using the remote right port for improved data throughput of the RX video stream.
Here are the 4 test runs that I performed 5 times each. I ran the mavic in a straight line on the same path until all signal was lost and RTH kicked in.
Left Remote port to Horizontal Polarized Antenna
Right Remote port left unplugged
Left Remote port to Horizontal Polarized Antenna
Right Remote port to Vertical Polarized Antenna
Left Remote port to Vertical Polarized Antenna
Right Remote port left unplugged
Left Remote port to Vertical Polarized Antenna
Right Remote port to Horizontal Polarized Antenna
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TEST-1
Left Remote port to Horizontal Polarized Antenna
Right Remote port left unplugged
View attachment 16371
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TEST-2
Left Remote port to Horizontal Polarized Antenna
Right Remote port to Vertical Polarized Antenna
View attachment 16372
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TEST-3
Left Remote port to Vertical Polarized Antenna
Right Remote port left unplugged
View attachment 16373
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TEST-4
Left Remote port to Vertical Polarized Antenna
Right Remote port to Horizontal Polarized Antenna
View attachment 16374
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This data sample is too small to make any serious conclusion, but there is evidence to suggest that using vertically polarized antennas on the left connector produces the best results. Time will tell and I will perform more tests and report back to the group at a later date, but wanted to give
@aczi a response to his question from this morning.