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P4 - poor range
1066 12 2017-8-13
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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Hi all

I bought a 2nd hand P4 recently. Perfect condition, checked flight logs, all looks good, not many cycles on the batteries. Was on the previous FW.

I flew it in a couple of places where my P3A would easily hit 3km + (out over the marshes where no one dares to go), and I get between 300m and 800m before a sudden loss of signal and RTH. Simply won't go beyond 800m and takes careful adjustment of altitude and antennas to keep a signal - but eventually it just drops off and RTH. During RTH with Phantom facing me signal is worse and drops more often.
There are no radio towers, or wifi sources nearby.

I updated the FW in the vain hope it would improve the range. It didn't. Everything else is great, but range is still like a P3S.

I'm assuming this isn't normal.... I'm also assuming it may be a bad antenna in the Phantom, more likely than in the radio - I think.

Any thoughts or tests I could run to pin point the problem?

Some examples:
http://app.airdata.com/main?share=roCcQN
http://app.airdata.com/main?share=rSHsYO
http://app.airdata.com/main?share=YVncFO

EDIT: Another clue (perhaps)
Just been out for another test. If I touch the left antenna when the Phantom is more than a few meters away I can instantly cause a total signal loss (control and video). Is this normal on P4? I never experienced it on my P3A
2017-8-13
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ALABAMA
First Officer
Flight distance : 10442687 ft
United States
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Mine will max out @ 1200 ft. Tried everything to get more, but just won't do it with stock.
2017-8-13
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P4Mano
lvl.4
Flight distance : 33990 ft
Spain
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I do not think it's normal to lose the signal in such a short distance.
Today I was trying out my p4 and I got 4km (+ -)
My advice is try to use another RC to make sure that the problem is the antennas
2017-8-13
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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Thanks. I sold my P3A so don't have another RC to try.
2017-8-13
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P4Mano
lvl.4
Flight distance : 33990 ft
Spain
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PaulSouthport Posted at 2017-8-13 13:13
Thanks. I sold my P3A so don't have another RC to try.

Try to use a RC (P4) from a friend!
I think it's the only way to know if the problem is in the antennas!
2017-8-13
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Aardvark
First Officer
Flight distance : 384432 ft
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United Kingdom
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PaulSouthport Posted at 2017-8-13 13:13
Thanks. I sold my P3A so don't have another RC to try.

An outside shot, but a re-link may also make a difference, assuming that the antenna are OK :-)
2017-8-13
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Blériot53
Captain
Flight distance : 6269839 ft
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France
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Are you using your tablet/phone in Airplane mode (ie Wifi OFF). It could make a difference.
2017-8-13
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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I've tried relinking and iPad is in airplane mode.

Think I'll have to check the antenna connections in the TX and phantom next.....
2017-8-13
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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Anyone here, in UK, have old transmitter antennas after an upgrade? I'll pay, I need to determine where the the issue is
2017-8-16
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HomePoint
Second Officer
Flight distance : 776007 ft
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United Kingdom
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You could ask on this group Paul, I find the people in the group always have things lying around that they didn't sell on.
https://www.facebook.com/groups/dronejunkyard
2017-8-16
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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HomePoint Posted at 2017-8-16 14:06
You could ask on this group Paul, I find the people in the group always have things lying around that they didn't sell on.
https://www.facebook.com/groups/dronejunkyard

Thanks! I'll give it a go
2017-8-16
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PaulSouthport
lvl.4
Flight distance : 1448799 ft
United Kingdom
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Here is an example of my P3A range - this was at 2200m out at 10m altitude. Looking for the wreck, I got to 4200m before making a battery decision to return.
Totally stock, RF quiet are.
No humans dare to venture out there, quick sand and tides.....
2017-8-16
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rudyasho
lvl.3
Flight distance : 547320 ft
Indonesia
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We have the same problem
2017-8-18
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