Antennas - how far apart?
Posted 02 February 2010 - 10:38 AM
By the way, i get no video interferance at all.
oh yeah also i have ordered a 2.4ghz video transmitter reciever which will arrive at the end of the month, might that solve all my woes?
thanks in advance.
Posted 02 February 2010 - 02:58 PM
Is the video TX running from its own battery?
Posted 02 February 2010 - 04:14 PM
Heres some pics, I basically got everything and simply stuck it on where it fitted at the time, no real thought went into it.
to answer your question I fitted a small 2cell 7.4v lipo to the bottom of the heli to power the video system which is rated at 9v, basically i didnt want to attach a 9v battery or use the 3cell lipo that runs the heli for fear of over powering it.
as i say im a complete newbie to fpv but im eager to learn. Any comments on 2.4ghz video would be appreciated too.
thanks in advance.
Posted 02 February 2010 - 11:29 PM
Edited by W3FJW-Ron, 02 February 2010 - 11:32 PM.
Posted 03 February 2010 - 12:06 AM
- Physically place the video TX and its antenna as far from the R/C RX and its antenna as you can.
- Set a channel on the TX which when multiplied by 2 is as far as possible from the 2.40-2.485GHz range, usually channel 4 is close to 1.3GHz, which fits well.
- Use as low video power as possible, 800mW is a lot when you can't guarantee physical separation.
You won't be able to use your 2.4GHz video TX, or it will be many times worse. What happens here is that your R/C RX gets "screamed in the antenna" by the nearby video TX, because every transmitter sends spurious emissions at all multiples of its operating frequency (harmonics), They're orders of magnitudes weaker than the desired output, but not negligible when the base power is so high and the distance that close. With your 2.4GHz TX, it would be the same, except that as it's the main output and not a "stray" one it's a lot more powerful
What's the brand of your R/C?
Posted 03 February 2010 - 12:17 AM
It also should be at least a few inches from any wiring or other equipment including batteries,the signal radiates from the sides of the aerial so needs a clear veiw out from the heli, not very easy to do I know but its worth finding a way to do it.
It can also help to change the type of aerial but I would try the one you have to start with.
Edited by Terry, 03 February 2010 - 12:26 AM.
Posted 03 February 2010 - 03:00 AM
couple of questions first, I cant set anything by channel as far as i can tell, I only have tuning knob on the Rx and on the transmitter theres a small screw, is that for tuning2? I did try fiddling with it but only made tuning it in harder.
secondly in the UK trhe 1.2ghz video requires a license which is why i wanted the 2.4 ghz system, will this really not work? if so what other alternatives are out there, seems to me i may be throwing my money out the window on my present course.
Posted 03 February 2010 - 03:24 AM
No, no solution with 2.4GHz video and R/C.
Those of us who use 2.4GHz video still use the good old 35MHz R/Cs (or whatever the "standard" R/C frequency is in your country), or specialised 433/868MHz links.
Apart from the 2.4GHz band for video, you have 5.8GHz, up to 25mW. But expect rather short ranges.
Posted 03 February 2010 - 04:03 AM
Right now I am going to move around the transmitter etc on the heli and ill post any significant findings on here later.
thanks for all your help, but please, keep it coming as its only your collective wisdom thats stopsing me from regressing back to my more primative self
Its an ESKY Belt Cp V2 with stock transmitter reciever
well ive tryed moving the Video Tx away from the heli Rx & away from as much wiring as possible but little to know change in the range, guess im a little stuck for the time being. heh!
Edited by m0nk3hjam, 03 February 2010 - 05:45 AM.
Posted 03 February 2010 - 06:40 AM
If I got a 35mhz 6ch heli Tx & Rx would i have any issues for eg. interference, digital servos not compatible etc, or would it just swap in, proper job??
Posted 04 February 2010 - 08:51 AM
So my new question is......
How easy is it to extend the Heli Rx Antenna to the tail?
All thoughts welcome.
Edited by m0nk3hjam, 04 February 2010 - 08:51 AM.