#Microlongrange OpenHD Edition

Hello All :slight_smile:

I made a remix of dave_c‘s awesome #Microlongrange project.

My goal was to create a quadcopter with 10km+ video range while still being able to fly below 250g starting weight for legal reasons.

I used the following hardware:

Flywoo Explorer Frame 4“
Matek F722 mini SE flight Controllers
Diatone Mamba F30 HV
TPlink T4U V1 wifi Card
Pi Zero 1.3
Arducam imx477 mini camera
BN220 GPS
5883 Magnetometer

Battery: 4S 850mhA liPo to stay below 250g
Or:
4S 18650 LiIon for maximum flight time ( of up to 38min.)

Here are all the 3D printed parts you will need to put it all togheter

And get an assortment of M2 screws with a flat head. The longest you will need is 16mm.

And some pictures from during and after assembly:

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Nice build! Pleas share your range results when you maiden- Good luck!

Thank you Luke :slight_smile:

I already did the maiden and it flys good on iNav default PID‘s.
Needs some tuning arround the yaw axis thought.
Afterwards I tested it’s freestyle ability’s and shattered the cameras IR filter… so this needs replacement.
I will do the Range testing afterwards, but judging the signal strength I saw until now, I think the battery will be the limiting factor, not the video link. But we will see.

Sounds really good!

I am playing with TPlink T4U V1 at the moment, but only getting maybe 150 meters of range. If you getting better results please share more details about your hardware and software setup.
Did you solder circular polarized antenna directly to card? Also, only one antenna is sticking out. Where is the second one?

Ah yes thanks for pointing out.
I soldered the RHCP antenna which came with the flywoo frame kit to the WiFi card. The second antenna is disabled in default settings, but I have it connected to the internal antenna to protect the amplifier if activated.

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could you tell which settings define that? I did some signal strength tests with antenna connected to each port, and it looks to me that both antenna ports are active in my setup. Most of settings are default thought.

Yes:

UseMCS=N
UseSTBC=N
UseLDPC=N

All of them =Y uses 2 antennas.
one of these or a combination of some could also do, Not sure exactly.

Could you specify your test setup?

Well, this is good question, because I have some doubts about my test too.
I use 1.5 meter antenna extension cable. I have an IP-9 connector adapter, so I can connect antenna to any port. Air and Ground sits about 1 meter apart. I connect one of Air antennas via extension cable and bring that antenna closer to Ground antennas. Signal strength (checking dbm indicator) increases significantly. And it acts the same, does not matter to which antenna port I connect that extension.
Is that because I bring ground (electrical ground) of that extended antenna closer and that is enough to increase signal strength even if that antenna isn’t active? And therefore my test is invalid?

I did same test with
UseMCS=N
UseSTBC=N
UseLDPC=N

and
UseMCS=N
UseSTBC=Y
UseLDPC=Y

and I got same results.

I don’t know im sorry.

Well that is fine. I am looking for answer how those dual antennas works for a while without success. I just wouldn’t be so sure that that 2nd antenna is disabled, but as long as it is connected to PCB, it shouldn’t be a problem.
Please update us once you have range report of your setup. I am really interested in that as I am using similar hardware on Air.

I think that is the correct link…

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I am wondering how openhd works for you on these micro drones. I mean how latency affects the experience.
My openhd based system gives me 115ms latency, but for calm flying on stabilized fixed wing is not a problem for sure. But what about these drones? Are you limited to cruising only? Or such latency is fine also for some more aggresive maneouvers?