Quadcopters / Drones / Helicopters / Rotary wings stuff > FPV
FPV in IRL
kankrz:
''It will be interesting to hear what kankrz has to tell us about the matter.''
What are you laughing at ? I really don't understand .The problem is that TX and Rx cannot be to close. Strong Tx signal will stop up/look Rx.
You loose control after a few meters flight. How do I know ? From people who tried to do this. Reportedly , FASST from futaba cause big problems. The only useful band is 1.2 or 1.3G.
Best regards
Happy Days:
Hey kankrz, I’m not laughing….I’m just asking a question. :?:
The Futaba FASST system ‘channel hops’ within a range of frequencies. The signal only stays on one frequency for a few thousands’ of a second before it moves off to another one.
I don’t quite understand what you mean when you say that a strong Tx signal will stop up/look Rx. What do you mean by that? :? (Sorry for being dumb, but I was born at a very early age!)
The problem you’re speaking of seems to be one of what’s called “Co-channel interference” But with modern digital signals I wouldn’t have thought this would have been a problem.
i.e. Mobile phones use Tx and Rx that are very close together without any problems at all. Admittedly a video signal is a few Megahertz wide and an audio one is only a few Kilohertz wide, but the principle is the same.
People make many strange claims as to why their models crash. :oops: I’m not saying that a problem with video links doesn’t exist, but I’m curious to hear a rational/specific answer as to why, rather than just generalized statements.
Keith
kankrz:
I can only say what I heard from people who tried to place video Tx and model Rx on board (close together). Please take under review that Video Tx are not perfect and have problems with frequency drift, temperature frequency drift etc. A few meters distance is OK but few centimeters is not enough. That is way flayers use 1.2G or 1.3G for video. 2.4 is not good for crowded places.
When you ask about FASST system , you're absolutely right but even that you will not see anything if this kind of Tx works close to you. This is from practice experience (not mine I have to stress).
I have just order Eagle Tree OSD and telemetry system for my 3.3m glider. The issue of Tx for video is still open. I am going to use 35MHz system and probably 2.4G. Wicklow Mountains is the place where I am going to fly. I'll let you know , be patient :)
best regards
PS sorry for my English
Happy Days:
Good luck kankrz, :clap: and do please tell us know how you get on with your system. :D
Keith
IceWind:
Hi kankrz,
I'm very pleased to see more ppl interested in FPV in IE. :)
As a big fan of AP I couldn't be more happy.
As for gear to use and putting aside legislation.
The best choice would be to have the TX/RX in 440Mhz ( there are some excellent kits that can go up to 5km or even more) and video on 2.4Ghz.
Of course having radio and video on 2.4Ghz is totally out of the question most of my friends that do FPV use is 900Mhz on video and radio on 2.4Ghz.
Btw let me know how good is the EagleTree OSD, I already have the eLogger and was thinking to get their OSD as well.
Nando
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