Identifying reception problems

[Coyote]

From time to time we get questions regarding picture quality.

Its hard to tell without seeing the video whats up, but then i came across this little gem. Its made by Sircana from FPVLABS.

It shows all the usual types of interference to compare your problem too and identify which it is thats effecting you

Interference covered :

Wifi Interference
Multipath
Propagation Loss
Polarization Loss
Antenna Radiation Pattern Nulls
Signal Obstruction

Analysis of Wireless Video Issues

This should help a lot of people out when experiancing a problem :)

[6lennn]

bookmarked, ta muchly

[g.collins]

added to favorites in youtube thanks.
:) G

[Funky Diver]

I reckon this is good enough to Sticky Coyote :)

[c0nners]

ta muchly

[FPV Matt]

This post is also quite helpful, to complement sircana's vid (it's pics rather than a vid)

;)

[Flyboysee]

Top drawer reference, thanks!

[BigT]

I am posting this here because if it had been here  3 moths ago I would not have wasted hours trying to sort it out.

The problem was that I had dark stripes running corner to corner  on the screen top left to bottom right.  These stripes "rolled" up the screen, froze, faded, came back and the rolled down the screen continuously. This actually made me feel sea sick and totally got in the way of the flight.  This was on 3 models, the only common denominator was the goggles, FS Attitudes and the Immersionrc 600Mw tx. 3 different cameras all on 12v, 3 different airframes, etc etc. I tried LC filters, swapping tX, esc, motors, radio etc etc.  Finally the solution was provided by Coyote and is as follows:
"Thanks to the great help and advice from Coyote  I have solved the problem. It may not be a "correct" cure but it has solved my problem of diagonal stripes rolling up and down the screen. The suggestion was that there was a "Harmony Conflict" between the voltage regulators in the VTx and the Camera, both of which are running on 12 volts. The solution given to me was to fit a LM 2590 DC-DC Step down adjustable power supply buck to the camera and supply to the VTx with the power adjusted to 9 volts, which I will do. To try the theory out whilst I am waiting for parts, I connected the 2 gnds on the tx and powered the tx with a 9 volt PP9. Magically the stripes disappeared even with 12 volt still going to the camera. Range is unaffected. Picture is crystal clear. The thought behind this is that the Tx was developed for use with 5 volt FS cameras so it was never an issue during development. So ImmersionRC tech guys you now have an answer. " I hope other noobs like me find this post.

[Loopdreams]

Just seen this post.  It sounds like exactly what's happening to me.  I'll try powering the VTx with a separate supply and see what happens

[Paul881]

Tomorrow is the day that I will bench test my fpv gear so fingers crossed that I won't need to have this thread - but as I'm using a 12 volt camera and an Immersonic Tx I'll probably have the same issues as Big T