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loses connection @210m distance
493 32 2017-4-16 20:15:00
Monyx
lvl.2
Flight distance : 46536
Australia
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Only obstacle was couple trees, pretty much line of sight yet to my surprise lost connection.  I have synced my flight record to cloud, can DJI analyse those once they're in cloud storage?
2017-4-16 20:15:00
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Bootspike
lvl.3
Flight distance : 33309
Australia
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Similar occurrence yesterday when the connection was lost. Details were distance was 200 metres, altitude 2 metres, speed was about 4 kph, some shrubs around but maintained VLOS. The machine initiated RTH and fortunately did not rise into nearby timber.  This seems to suggest a loss of signal should result in a hover for ten seconds or so giving a chance for the signal to reconnect prior to initiating a RTH.
My logs are also loaded but I will have a chat with the retailer tomorrow as I also routinely lose video feed to the controller.

While this may sound a little negative, I will persist as the quality and stability of the video from the P4P is what I really need.
2017-4-17 00:09:28
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Eric13
Second Officer
Flight distance : 467422
Germany
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Bootspike Posted at 2017-4-17 00:09
Similar occurrence yesterday when the connection was lost. Details were distance was 200 metres, altitude 2 metres, speed was about 4 kph, some shrubs around but maintained VLOS. The machine initiated RTH and fortunately did not rise into nearby timber.  This seems to suggest a loss of signal should result in a hover for ten seconds or so giving a chance for the signal to reconnect prior to initiating a RTH.
My logs are also loaded but I will have a chat with the retailer tomorrow as I also routinely lose video feed to the controller.

That is a VERY low angle. Did you have your antennas vertical?
2017-4-17 01:59:14
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Bootspike
lvl.3
Flight distance : 33309
Australia
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Eric13 Posted at 2017-4-17 01:59
That is a VERY low angle. Did you have your antennas vertical?

Yes Eric, the angle is very low, but the antennas were vertical. That is, set at 45 degrees with the controller at 45 degrees. The video link started to break up which is unfortunately fairly common and the the message appeared then appeared that the link was lost.

As I mentioned, the quality of the video was excellent which is why I am using this unit. In this instance, we were following a bush track from a persons perspective and intending to lift over the water of a farm dam to take in the sunset at max altitude. This flexibility is great, but I think this particular unit may have a glitch. The flight time for it is a little over 5 hours and I admit, some learning is still happening. Some further checking is to be done.
2017-4-17 02:30:47
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Eric13
Second Officer
Flight distance : 467422
Germany
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Look at the following link. Maybe it helps.
I havent' tried it and wouldn't know how to fly with the RC being itself vertical:
http://www.gearbest.com/blog/how ... our-transmitter-809
RC.jpg
2017-4-17 02:48:09
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Mark The Droner
First Officer
Flight distance : 888
United States
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Flying that low with signal problems suggests possible fresnel zone complications:

https://en.wikipedia.org/wiki/Fresnel_zone

If so, you could solve the problem with an antenna mast or by switching to horizontal polarity.

2017-4-17 03:08:57
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Bootspike
lvl.3
Flight distance : 33309
Australia
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Thanks gents, I really appreciate your thoughts. The antenna/ controller position was as per diagram 1 in Eric's link with the antennae vertical. Marks link to the Fresnel effect bears some consideration. When I get some time in an open paddock with no trees, I will try this out.

My greatest concern was the RTH could have easily resulted in an ascent into trees. Although there weren't many, it only takes one. That was the reason for a suggestion that a ten second hover prior to an ascent may have value. Simply allowing some time to regain control could overcome some risk.
2017-4-17 03:27:44
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Monyx
lvl.2
Flight distance : 46536
Australia
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Ok...turns out I am an idiot. Some time later as I was packing the controller away I thought to myself 'hmm I don't recall folding up the antennas'...I had them crossed and folded, the 9.7" ipad blocking them from visual check. Note to self: actually conduct methodical pre-flight check from now on. I have learnt from my experience - amuse yourself with the panic in my voice on the cache recording as I experience the joys of new drone ownership LOL.

2017-4-17 06:45:54
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Eric13
Second Officer
Flight distance : 467422
Germany
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That's really funny!!
I think most of us went through some stressful situation with the drone.
2017-4-17 10:51:26
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Delta Nine
Second Officer
United Kingdom
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Yup sticks down
ure.JPG
2017-4-17 11:31:38
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Bootspike
lvl.3
Flight distance : 33309
Australia
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Monyx Posted at 2017-4-17 06:45
Ok...turns out I am an idiot. Some time later as I was packing the controller away I thought to myself 'hmm I don't recall folding up the antennas'...I had them crossed and folded, the 9.7" ipad blocking them from visual check. Note to self: actually conduct methodical pre-flight check from now on. I have learnt from my experience - amuse yourself with the panic in my voice on the cache recording as I experience the joys of new drone ownership LOL.
on the cache recording

Fingers crossed, not the antennae! Glad you have sorted it.
2017-4-17 12:24:19
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SPIKE_151
lvl.4
United Kingdom
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If you have trees., however sparse between you and the drone, you will get breakup of signal, the antennas vertical is the correct setting only for 5.8 ghz , they should be tilted at 60 degrees towards the drone for 2.4 ghz transmission as per the owners manual states. Circular polarized antennas can give better penetration through trees for signal, as will boosters like the Maxx Uav and Triton.
2017-4-19 03:41:48
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paukstis91
lvl.2
Lithuania
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yup. had same situation also, when i lost signal in in 100 metres height, but my drone was only couple meters away when I realized that controller's antennas was crossed. after that mistake never happened again.
2017-4-19 03:53:25
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Mark The Droner
First Officer
Flight distance : 888
United States
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SPIKE_151 Posted at 2017-4-19 03:41
If you have trees., however sparse between you and the drone, you will get breakup of signal, the antennas vertical is the correct setting only for 5.8 ghz , they should be tilted at 60 degrees towards the drone for 2.4 ghz transmission as per the owners manual states. Circular polarized antennas can give better penetration through trees for signal, as will boosters like the Maxx Uav and Triton.

they should be tilted at 60 degrees towards the drone for 2.4 ghz transmission as per the owners manual states.

Could you expound on this please?  I can't find anything in the P4P manual...
2017-4-19 04:32:42
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paukstis91
lvl.2
Lithuania
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Mark The Droner Posted at 2017-4-19 04:32
they should be tilted at 60 degrees towards the drone for 2.4 ghz transmission as per the owners manual states.

Could you expound on this please?  I can't find anything in the P4P manual...



here is explained by dji
2017-4-19 05:47:57
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Mark The Droner
First Officer
Flight distance : 888
United States
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Thank you.  I was hoping somebody could give me a technical explanation...
2017-4-19 06:27:30
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SPIKE_151
lvl.4
United Kingdom
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Mark The Droner Posted at 2017-4-19 04:32
they should be tilted at 60 degrees towards the drone for 2.4 ghz transmission as per the owners manual states.

Could you expound on this please?  I can't find anything in the P4P manual...

From the RC section of the P4P manual page 49

from the manual, RC controller section

from the manual, RC controller section
2017-4-19 07:13:37
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Mark The Droner
First Officer
Flight distance : 888
United States
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Thanks very much.

I'd appreciate a technical explanation for the 2.4 ghz 60 degree tilt ... anybody... ?  
2017-4-19 07:52:13
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Bullflyer
lvl.4
Spain
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Mark The Droner Posted at 2017-4-19 07:52
Thanks very much.

I'd appreciate a technical explanation for the 2.4 ghz 60 degree tilt ... anybody... ?

Yes please, I do not understand the relation between the frequencies, and the angle of the antennas
2017-4-19 08:40:19
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DJI-Jamie
DJI team
Flight distance : 34261
Canada
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Mark The Droner Posted at 2017-4-19 06:27
Thank you.  I was hoping somebody could give me a technical explanation...

This video should help. While they're omnidirectional antennas, the shape of the antennas have sections that emit a stronger frequency than others. That goes for both the RC and aircraft:

2017-4-19 08:43:45
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Bullflyer
lvl.4
Spain
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DJI-Jamie Posted at 2017-4-19 08:43
This video should help. While they're omnidirectional antennas, the shape of the antennas have sections that emit a stronger frequency than others. That goes for both the RC and aircraft:

https://www.youtube.com/watch?v=P7M9JtfVwQE

Thank you, but it says nothing about the frequency difference and the angles of the antennas in the transmitter.
The only relationship that exists between antennas and frequencies is that for a frequency of 2.4 Ghz we need an antenna twice as long ( + or - ) as for a frequency of 5.8 Ghz. Based on wavelengths
2017-4-19 09:12:49
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Eric13
Second Officer
Flight distance : 467422
Germany
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SPIKE_151 Posted at 2017-4-19 07:13
From the RC section of the P4P manual page 49

That is a misleading diagram by DJI. The antennas are still vertical.
They are just 60° in relation to the RC which is being held abnormal.

2017-4-19 09:54:17
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Mark The Droner
First Officer
Flight distance : 888
United States
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This morning I was just generally lost.  Now this afternoon I'm completely lost.  I don't know whether were supposed to hold the controller on a horizontal plane, at a 45 degree angle, vertical, and also how we're supposed to hold the controller given different frequencies and antenna angles.  Maybe there is something proprietary going on with the signal as it leaves the DJI engineered antenna and we're not supposed to understand what exactly is happening...
2017-4-19 11:43:38
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Eric13
Second Officer
Flight distance : 467422
Germany
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I have the best results keeping the antennas always vertical while holding the RC almost horizontal. Having it horizontal is just my comfortable position.
Only if AC is near and above I tilt the antennas all the way down.
2017-4-20 00:23:13
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Bullflyer
lvl.4
Spain
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I think the best position is to imagine a perpendicular line to the antennas, and direct it towards the Phantom.                                     It's like shooting in the old west, if the antennas are 90º from the transmitter, pointing the top of the transmitter towards the Phantom, I think that the best angle is achieved.


2017-4-20 00:36:29
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Bullflyer
lvl.4
Spain
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You can see the 90º configuration in this picture



2017-4-20 00:48:22
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SPIKE_151
lvl.4
United Kingdom
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Eric13 Posted at 2017-4-19 09:54
That is a misleading diagram by DJI. The antennas are still vertical.
They are just 60° in relation to the RC which is being held abnormal.

I followed the manual while the drone was in warranty but I use this now, Titan Range Extender with built in 3 watt amps, power meter, built in 3000 m/amp hour battery, quick snap connectors and magnetic mount.
18010951_10158373327195012_1731051556032005291_n.jpg
2017-4-20 23:14:09
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Bullflyer
lvl.4
Spain
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SPIKE_151 Posted at 2017-4-20 23:14
I followed the manual while the drone was in warranty but I use this now, Titan Range Extender with built in 3 watt amps, power meter, built in 3000 m/amp hour battery, quick snap connectors and magnetic mount.

Spike, if the transmitter falls on your foot, you'll probably have to go to a hospital.
How much does it weigh?
2017-4-21 03:04:53
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SPIKE_151
lvl.4
United Kingdom
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not so much that I need a neck strap, if you were a child you might need some help.
2017-4-21 07:09:02
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Bullflyer
lvl.4
Spain
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SPIKE_151 Posted at 2017-4-21 07:09
not so much that I need a neck strap, if you were a child you might need some help.

Do you get good results with it ?
2017-4-21 07:43:25
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SPIKE_151
lvl.4
United Kingdom
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Yep its a fantastic product, I think better than the Maxx Uav system as its neatly packaged, but that's just my opinion, others may differ in their opinion
conquer 1.jpg
2017-4-21 10:58:25
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Bullflyer
lvl.4
Spain
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SPIKE_151 Posted at 2017-4-21 10:58
Yep its a fantastic product, I think better than the Maxx Uav system as its neatly packaged, but that's just my opinion, others may differ in their opinion

Did you buy the T.R.E. in Europe ?  And how much did you pay ?
2017-4-21 14:09:42
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SPIKE_151
lvl.4
United Kingdom
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I bought it direct from the manufacturer in the USA , had it sent to UK it was 299 dollars US
2017-4-22 01:32:08
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