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Old Jan 28, 2014, 09:34 PM
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Kavil194's Avatar
Türkiye, Eskişehir
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Diagnosing RF problem of my FPV setup?

hi everyone. i made a video clip which actually pretty short and informative about my problem. I really appreciate if you could watch and give me some solutions or causes of my video quality problem.
i will one or two videos after i edit them. but for now this video is enough to show you my problem. video's quality little bit reduced due to uploading on youtube...
Ground RangeTest of HK 900 Mhz 200mW 420Tvl PAL FPV kit (3 min 7 sec)


direct copy paste from my other thread.
------------------
thanks to IBcrazy i made my inverted vee using his thread here:
http://www.rcgroups.com/forums/showthread.php?t=1159968
i have 900mhz 200mW hobbyking fpv set

as he mentioned Length in mm = 69200/f in MHz so i decided to fly in 1040mhz and found length
69200/1040=66.53mm
the leg soldered to inner conductor lenght is exacly 66.5 mm from tip of cooper wire to place the inner insulation ends
and 66mm for the other leg which soldered to shield
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Old Jan 28, 2014, 09:41 PM
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well... your soldering looks a little.... rough... cant say for sure that its your issue, but it cant be helping.
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Old Jan 28, 2014, 10:36 PM
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Having the video play faster is a bad thing for us too watch. Hard to tell whats noise, interference or loss of video sync. Almost looks like a weak video signal. Should be 1 volt peak to peak.
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Old Jan 28, 2014, 10:39 PM
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Originally Posted by Martin Y View Post
Having the video play faster is a bad thing for us too watch. Hard to tell whats noise, interference or loss of video sync. Almost looks like a weak video signal. Should be 1 volt peak to peak.
i understand the point you say. i didnot want to bore people with 12 min video i am walking with shaky and static video... but i will edit some parts of video which is real time and uneditted so i hope you guys can explain the issue.
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Old Jan 29, 2014, 02:18 PM
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i watched this video from eirlink and tried to match my issue but i couldnot manage.
maybe you can.
http://www.rcgroups.com/forums/showthread.php?t=1961020
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Old Jan 30, 2014, 12:21 AM
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Originally Posted by Martin Y View Post
Having the video play faster is a bad thing for us too watch. Hard to tell whats noise, interference or loss of video sync. Almost looks like a weak video signal. Should be 1 volt peak to peak.
here short realtime footage of ccdcam. hope you or other people can diagnose.
Footage1 (3 min 1 sec)
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Old Jan 31, 2014, 02:32 AM
FPV Proximity is FUN!
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I got those lines when using a recorder. Here is my vid
First FPV flight ever! (1 min 35 sec)


Solved by using a HD camera on board to record flights.

-Ben
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Old Jan 31, 2014, 05:24 AM
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at some point you have interferences from your motor/power regulator and a bad camera from my point o view.
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Old Jan 31, 2014, 06:15 AM
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How close is the remote tx to your recorder & gs when you fly? You may have a bad cable or too long a cable.
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Old Jan 31, 2014, 08:09 PM
FPV Proximity is FUN!
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I stand right next to my GS.

-Ben
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Old Jan 31, 2014, 10:18 PM
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Quote:
Originally Posted by fOaMmaSh87 View Post
I got those lines when using a recorder. Here is my vid http://www.youtube.com/watch?v=IuwUeFYUQP8

Solved by using a HD camera on board to record flights.

-Ben
hmm thats weird. why or how can Laptop- Easycap can create those lines or interferences?
It maybe okay for now but in future when I go few kilometers I will definitely record FPV cam with OSD because if i lost-crash plane few km away from me only possible solution to find it via looking last knows gps positions. HD cam on plane could not help me with that unfortunatelly..

--- and for Martin Y's question. My friend was watching laptop 5-6 meters away from me and i was TRYING to fly plane LOS. (plane is unstable because of not having offset on motor and cam angle is too upwards. I fixed them both and gonna try plane few hours later.)
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Old Feb 01, 2014, 07:10 AM
FPV Proximity is FUN!
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You could try using a DVR.
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Old Feb 01, 2014, 09:35 AM
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Quote:
Originally Posted by Kavil194 View Post
hmm thats weird. why or how can Laptop- Easycap can create those lines or interferences?
if incorrect mode is used on Easycap those lines could appear because of bad synchronization.
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Old Feb 02, 2014, 12:59 PM
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Originally Posted by schumixmd View Post
if incorrect mode is used on Easycap those lines could appear because of bad synchronization.
i use PAL_B for recording.
made another flight yesterday. i think those lines caused by bright sun lingt in crappy CCD cam lens. whenever sun light comes to lens video just goes bad.
some other interferences caused by as schumixmd mentioned before motor cam itself etc..

i will get few ferrite choke rings and try to overcome any RF noise on any cable by just using ferrite on cable carries current..
Footage2 1 (3 min 58 sec)
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