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Getting 10km out of your 2.4ghz futaba fasst!

PostPosted: Sat Nov 26, 2011 7:05 pm
by lithoushine
I started out with the question "how to increase the range of your 2.4ghz rc transmitter?" because i have been improving my fpv system. i can get about 5km on my video but i thought whats the point when i'm limited to about 1mile with my futaba and the only other thing is the uhf systems that cost 350$+. so i started looking around and i read a bunch of old forms made in 2009(http://www.rcgroups.com/forums/showthre ... 60&page=25) and they were throwing around the idea of putting patch antennas on on their transmitters and/or putting wifi boosters and were getting great success(i thought if they got it to work back then why is not widely done today?). the forms were really scattered about 25 pages long but here is the basically what i got from it.

To put a patch antenna on was really simple for futaba. If you take off the back of the case you will see a wire that comes out of the antenna and plugs into the board. The connector is called U.FL . That just pops off and then you need to get a pigtail adapter U.FL to sma female or what ever connector on the antenna you wanted to use. Most of the people on the form used 8dbi patch antennas with a H-75degrees and V-65. they were worried that a 14dbi would be to small of a field but one guy used a 14dbi with no problem. They were to afraid to to do long distance flights. One guy did get out to 5km with just an 8bi patch. They did do ground tests with lowered voltage that were consistent. Both of the guys were able to walk about 60meters with the stock futaba antenna, then with the 8dbi patch they were able to walk a little over 300meters!! thats a 5x increase in distance. that should translate to, if your getting 1mile stock, about 5miles range! i feel like everyone who is looking to get more rc range for fpv should be doing this! But wait it gets better with booting or amplifiers.

So for boosting you start off with the pigtail adapter and then find your booster of choice they used this one with sucsess(http://www.dealextreme.com/p/2-4ghz-100 ... ters-19616)I believe the stock futaba has about 100mw of power. The booster screws right in but it needs 6volts and the transmitter battery is to high so you could get a ubec to bring down the voltage to 6v or use a separate battery and then your antenna of choice. One guy got 6km with that booster(1mw) and a 2dbi antenna but if you were to put a patch antenna on 10km+ is possible! Some other problem arise with boosters aswell like overheating.

Alright thats my information not quite sure what i'm getting at but i thought it was a really intersting topic and was just trying to spark some interest. I personally just purchased a 8dbi patch and will try and replicate the results when it comes but i think it would be a great thing for you to look into bruce. thanks :D

Re: Getting 10km out of your 2.4ghz futaba fasst!

PostPosted: Tue Dec 06, 2011 3:08 pm
by JETSKIDOG
HI BRUCE, THANKS FOR YOUR INFO I'AM WANTING TO GET INO FPV MYSELF THE ONLY
THING PUTTING ME OFF WAS HOW SHORT THE RANGE WAS ON MY FUTABA ,THIS HAS GIVEN ME THE PUSH TO GET ON WITH IT
AND TRY IT OUT,THANKS AGAIN,GEORGE.