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Old Nov 12, 2008, 04:23 AM
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motiganot's Avatar
Israel
Joined Jun 2008
241 Posts
Discussion
Which RC system go more far away ???

Hello to you all.
2.4 system or 72 system.
some friends told me that the 2.4 system
not reliable beyond the 1 Km .
The 72 system can go beyond 2 Km with no problems.
It is true ???
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Old Nov 12, 2008, 04:36 AM
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thomasscherrer's Avatar
Danmark, Hovedstaden, Ballerup
Joined May 2007
3,221 Posts
all conventional RC systems are designed for VISUAL range,
so that means how far can the users normally see their planes,
and then they have designed a bit of margin in there.

when you want to fly FPV you have the possibility to fly much futher away,
this uses all the safety margin they have designed into the RC range, and then you get into trouble.

normally I would expect a 72MHz system to perform longer than a 2.4Ghz stock system, but achived range depends on many factors, so the same person needs to make several installations and test flights to really tell what perform the best.

if your goal is long range FPV I suggest you think different, and dont use stock radios
like this system:
http://www.rcgroups.com/forums/showthread.php?t=905915
but again, why not start with your stock radio and perfect the video link
and perfect your FPV skils first, then later come back and look on my long range system, it can be connected to large antennas and big and strong poweramplifiers cheaply available to give you any range you can dream of, 10km 50km 100km what do you want, we have it.
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Old Nov 12, 2008, 05:25 AM
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motiganot's Avatar
Israel
Joined Jun 2008
241 Posts
Hello thomasscherrer

This is a video of my latest flight :

http://www.vimeo.com/2127409




I do not think that my FPV skills present any problem …
Now I use futaba 9CHP 72 system and I thinking to
Convert it to the 2.4 model.
thanks for your response
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Old Nov 12, 2008, 09:00 AM
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thomasscherrer's Avatar
Danmark, Hovedstaden, Ballerup
Joined May 2007
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>I do not think that my FPV skills present any problem

I am sorry, that was not my intention to let you think like that,
I just think that normal (short) radio range can still be funny and a challenging,
but you are way pass that level :-) and now you seek more range to make it more funny, cool, I will be here, when you need me..
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Old Nov 12, 2008, 11:46 AM
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sokiii's Avatar
Chicago, IL
Joined Jan 2008
457 Posts
72 MHz radio is better than 2.4 GHz for long range FPV. With good antenna range is >8km.
8km FPV flight (7 min 38 sec)
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Old Nov 12, 2008, 05:36 PM
Registered User
motiganot's Avatar
Israel
Joined Jun 2008
241 Posts
futaba 72

Sokii good one…

Thomasscherrer. noting to be sorry.
Can you suggest me how can I make
My system to reach 2 Km with no interference !
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Old Nov 12, 2008, 07:49 PM
glassfox's Avatar
Tianjin, China
Joined Jan 2008
2,734 Posts
yeah, my 72mhz futaba FF9C +319dps rx also reached 2km, little noise on control ,but still ok.
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Old Nov 13, 2008, 05:17 AM
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zaguruinzasky's Avatar
Verona - Italy
Joined Jan 2007
2,527 Posts
good antenna? what are you using?

Thanks
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Old Nov 13, 2008, 12:30 PM
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sokiii's Avatar
Chicago, IL
Joined Jan 2008
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Quote:
Originally Posted by zaguruinzasky
good antenna? what are you using?
59" vertical antenna on the plane
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Old Nov 13, 2008, 02:19 PM
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Portugal
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Hi sokiii,

Is that double lenght or more? how lenght is important to the rx?
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Old Nov 13, 2008, 02:26 PM
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sokiii's Avatar
Chicago, IL
Joined Jan 2008
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Quote:
Originally Posted by mpluis
Hi sokiii,
Is that double lenght or more? how lenght is important to the rx?
It's close to 3/8 wavelength. Read http://www.rc-cam.com/ant_exp.htm
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Old Nov 13, 2008, 03:01 PM
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igorp's Avatar
United States, CT, Bloomfield
Joined Aug 2007
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I doubled the length on my antenna also and noticed a huge increase in range. I use a Futaba r138dp pcm rx. I have my antenna pointing straight down though.
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Old Nov 13, 2008, 04:09 PM
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Portugal
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Ok, thanks for the link sokiii, I will double too and maybe do a mast with a
very fine carbon tube and two string stays.
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Old Nov 13, 2008, 05:58 PM
Smoke on , go !
zaguruinzasky's Avatar
Verona - Italy
Joined Jan 2007
2,527 Posts
as initial lenght to start the experiments, canyou suggest somthing for the Futaba R-149DP in 35mhz?

Thanks!

edit:

antenna lenght calculator... interesting:
http://www.qsl.net/kd4sai/antencal.html

do I need any special cable to do an antenna or any electric cable is ok?
Thanks
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Old Nov 13, 2008, 06:20 PM
Smoke on , go !
zaguruinzasky's Avatar
Verona - Italy
Joined Jan 2007
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--- added above ---
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