Transmitters and receivers

Hello. I've been looking at RC gear and i have a couple of questions.

Transmitters

1. Why are the ones with the wheels more expensive? Especially when they have fewer channels.
2. Typically, how are the third and forth channels controlled? Ie, is it just a button, pot or what?

I want a wheel style transmitter but it seems like the regular kind might be more practical.

Receivers

1. What outputs from each channel on a receiver? Is it a varied voltage? PWM signal? How does it work?
2. Are they all pretty much the same?

The reason i ask is because i think i want to try and make my own speed controllers. I have help but I've been asked to do the research first.

If anyone could help or link me to reliable information, then please do.
Also if anyone wants to add anything they think is valuable info to an RC noobie, then please do!

Cheers,
Chris.

On a four channel transmitter, there are two joysticks with two different movements: forwards and backwards or left and right. Each of these movements is one channel.Attachment 3998So each joystick can be moved forwards and backwards and left and right.

Here is a lot of interesting information about the signal output of a receiver:
http://rcarduino.blogspot.co.uk/2012...iver-with.html
For a featherweight I imagine with the right knowledge you could make a speed controller, it's not too complicated but may well be as expensive as a pair of botbitz controllers. One thing I would say though is don't underestimate the currents involved- it needs to be designed to cope with the stall amps of your motors so depending on motor choice I'd design for 50A per motor to be safe.

Quote:

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Originally Posted by Porker

On a four channel transmitter, there are two joysticks with two different movements: forwards and backwards or left and right. Each of these movements is one channel.Attachment 3998So each joystick can be moved forwards and backwards and left and right.

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So all four channels are on the joysticks?
I was more curious as to how they work on this style of transmitter...

http://www.losipartshouse.com/catalog/SPM4000-450.jpg

I'm trying to figure out how a weopn would work.

Quote:

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Originally Posted by Max

Here is a lot of interesting information about the signal output of a receiver:
http://rcarduino.blogspot.co.uk/2012...iver-with.html
For a featherweight I imagine with the right knowledge you could make a speed controller, it's not too complicated but may well be as expensive as a pair of botbitz controllers. One thing I would say though is don't underestimate the currents involved- it needs to be designed to cope with the stall amps of your motors so depending on motor choice I'd design for 50A per motor to be safe.

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Cheers mate that's some useful info.
I've already stalled my motors to see exactly how beefy my controllers need to be and i'll probably double that.
Yeah i'm gonna do a featherweight. I cant afford to go any bigger.

I use the dx3e the 3rd channel can be set as a on or off or a forward, off, reverse but it won't work with esc But works well with a servo and 2 micro switches to control the weapon

http://www.fightingrobots.co.uk/thre...-spektrum-tx-s :)