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07-23-2006 06:50 AM  14 years ago
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Tobias2

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Pharr, TX-USA

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Futaba vs JR Tx
Gentlemen,

I already had several crashes due to a not so good or not so powerful signal from my 9C Futaba transmiter.
Is JR Tx a better technology than Futaba or is there any other Tx brand powerful and good enough to let me fly high (1500 to 2000 feet) without loosing signal?

Thank you in advance for your kind help.

Tobias2
LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-23-2006 06:55 AM  14 years ago
MR SLOWFLOW

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N.J/N.Y

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why so high?
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07-23-2006 10:55 AM  14 years ago
Yug

rrMaster

UK. Herts

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Tobias2 - sounds like you're not setting up your rx antenna very well. I use the 9C Tx and 149Rx and get a flawless range check of 400 feet with the tx aerial fully collapsed. That equates to a range with tx aerial fully extended of 2 miles.
Rx antenna mounting is very important. ideally, the more antenna area you have the better, and the further away from the heli, the less attenuation and shaddowing you get. Many folk tiewrap the antenna to the boom supports which is a disaster because they will attenuate the received signal by a large amount.
The most successful design I've come up with is a 3mm carbon rod antenna mounted on the skids. Carbon is a great conducter, flexible and self supporting. The rod length is about 20" and the total rod + wire length maintains 39". The join is made using a brass sleeve epoxied onto the antenna with silver loaded epoxy. The wire is soldered to the brass sleeve.

Vegetable rights and Peace
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07-23-2006 02:02 PM  14 years ago
Eury

rrProfessor

Dover NH USA

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I agree, you are not setting up the antenna well. Flying with a 9z on our giant scale planes, we had someone come by the field to check out what was going on, said that my friend's 40% Carden flew over their house a mile and a half away. I've also speced out my 30% Yak straight up until I could barely see it with my 9z, I guarantee it was a lot farther away than you could get a heli, just due to the size and stability. When it finally was almost gone from view (straight up, 85inch airplane), I put it into a spin to come back down, and it took a good 45 seconds to a minute to get down to where I could tell which way it was pointing. All with Futaba PCM receivers with stock antennas. I get around 200 feet or so in a ground range check, and could probably go farther, but that's where I stop walking with both my planes and helis, which have base loaded antennas.

Damn Guy, that's one hell of a Raptor!
Nick Crego

Citizen #0168
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07-23-2006 08:04 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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I've had a 2meter sail plane so I I could barely tell which way it was going with a 9c but to answer your question as to a comparison, they are set to the FCC max output in the US which is like 1 watt or 4 watts or something, I'm sure they are set that way for all of North America for simplicty so no JR isnt going to be more powerful than Futaba.Andy
AMA 77227
http://www.jaxrc.com
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07-23-2006 10:35 PM  14 years ago
Roamer

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Albuquerque, NM

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I have to sing with the choir on this one! At 2000ft, the only way you are running out of transmitter power is if there is something wrong with your transmitter module. Otherwise, it is either antenne routing or possible a problem with your receiver.

There is nothing wrong with the transmitter power of Futaba radios. They can control your heli WAY beyond your ability to see it. IF everything is set up and working correctly.
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07-23-2006 10:37 PM  14 years ago
Tobias2

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Pharr, TX-USA

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Gentlemen,

Thank you for your kind comments. They are very helpful. I will follow your advise.
By the way, I was flying so high because was taking pictures.

Thank you all.

Tobias2
LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-24-2006 06:34 AM  14 years ago
Pistol Pete

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Seffner, FL

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Care to share those high altitude photos?~~Enjoying the hobby one flight at a time~~
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07-24-2006 07:57 AM  14 years ago
Tobias2

rrNovice

Pharr, TX-USA

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Sure. Here are some of them.

LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-24-2006 09:58 AM  14 years ago
tchavei

rrProfessor

Portugal

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Thats sick dude!


I wonder how you control stability at that distance... co-pilot? Commander? General laser?


Tony

--------------------
"Perfection and patience usually walk side by side..."
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07-24-2006 04:15 PM  14 years ago
Tobias2

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Pharr, TX-USA

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In fact I barely see the heli. I see a little dot on the sky. No more. I fire several pics so will have more chances to get a good one.LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-24-2006 04:18 PM  14 years ago
Tobias2

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Pharr, TX-USA

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Forgot it: Didn´t use co-pilot or anything else. Just practice.LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-24-2006 10:45 PM  14 years ago
tchavei

rrProfessor

Portugal

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anything that is over a 60 degree angle above my head becomes difficult to control. Congratulations!

Tony

--------------------
"Perfection and patience usually walk side by side..."
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07-25-2006 12:59 AM  14 years ago
Tobias2

rrNovice

Pharr, TX-USA

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Thank you for your kind comments.

Tobias2
LOGO 10 3D: 5S3P, C50 15L, Phoenix 80 ESC,13Teeth,GY401, Digital Servos S9650, Tx 9CH-PCM
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07-25-2006 03:31 AM  14 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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Jr is good for a mile if you can see it. DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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