My latest build. TBS Discovery, Taranis, 3D Robotics Pixhawk, ImmersionRC 5.8Ghz vtx, 3DR GPS, Telemetry Radio, T-Motor 900kv, 30amp ESC, APC 10x4.8, 4S 3300, GoPro 3+ Silver. About 10 min flight time @ 1468 grams.

Views: 1473

Comment by Guy McCaldin on June 9, 2014 at 7:49pm

Very tidy job.  

Depending on your flying habits, it might not be necessary, but rotating one of the FrSky antenna 90° so that it is perpendicular to the other will in theory give you better performance:

To match the horizontal positioning on the receiver antenna (i.e. they are horizontally polarised), keep the antenna on your RC transmitter in a horizontal plane by swivelling it left or right.  

An alternative, which is actually what is recommended by FrySky, is to have one of the receiver antennas vertical (i.e. vertically polarised).  In this case, you would leave one of the antennas horizontal, and keep your transmitter antenna vertical.

Again, this is only necessary to maximise range, so it might not apply to how you fly.


Developer
Comment by Rob_Lefebvre on June 9, 2014 at 9:31pm

Actually, better to have the antennas in a V-shape, with a 60-90 degree angle.  Then as you roll and pitch, at least one of the antennas is close to vertical.

Comment by John on June 9, 2014 at 10:02pm

Very nice build! What is your range with the 5.8 video tx?

Comment by Muhammad Al-Rawi on June 9, 2014 at 10:05pm

A very clean build indeed!

A month ago I was setting up a scratch build plane for FPV and coudn't find a definitive answer regarding V vs. L configuration. So I stuck a receiver (D4RII) on my mailbox and walked to the end of my court with my Tx in range test mode. Standing in the same spot, I read a RSSI value around 65 for the L configuration and around 88 for the V configuration.

Not really scientific, but I've stuck with the V configuration and managed to go about 1km out with an ocational beep here and there. 

That being said, I see many LRS systems recommending the L configuration. 

Comment by Hugues on June 9, 2014 at 11:42pm

About the antenna positioning, try also not to stick them flat on these carbon fiber plates because they conduct electricity and will act as electric field shields, effectively impacting your receiver antennas. If you can, try mounting them at 90degrees as a V attached to a pole above the CF plates.

Comment by Mike T on June 10, 2014 at 5:12am

any vibes in your vids?

Comment by Darrel Klassen on June 10, 2014 at 1:12pm

No vibs, smooth as glass and I have minimal dampening on the GoPro although I just bought a love seat for it. I'll have to take a look at my antennas, didn't pay that much attention to placement. I don't do anything real long distance, I think the farthest I've been out is maybe a quarter mile. Didn't have any issues. Probably not a bad idea to reevaluate though.

Comment by Stefan on June 10, 2014 at 10:00pm

Nice how does it fly?

Would mind putting up a print screen of your pids :)

I have one but cant get the PIDs correct.

Comment by Mike T on June 10, 2014 at 10:05pm

i'm using sunnysky 800kvs and i get bad vibes. graupner props.

Comment by Greg Dronsky on June 11, 2014 at 3:16am

im using 900kv, and also recommend graupner props :)

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