just want to know....
1)i have seen 4ch transmitter there are 4 way movement ...and when i m watching images of 6ch or 10 ch they are also having the same arrangement ,howcome we can control 10 channels or 6channels from those 2sticks

2)some sites say they have mixing feature in their transmitter , so i dont need to use v tail mixer in my system ,is it like that or something else

yes you can laugh at my questions but plz answer if u know even little about my questions

Only 4 are controlled via joysticks, rest are more of on-off switches that perform different tasks

Pankaj

like can we control 9 servos and one motor by a 10 ch tx 

I don't know about others, but my Eclipse 7 has 6 proportional channels and one switched channel

1.  Each channel typically controls a single servo (or two servos using a Y cable).  But moving of a stick can be used to control more than one channel/servo, using programmable mixes in the radio itself. That is one of the reasons why you have two sticks with typically 4 degrees of freedom, yet you can induce movement in more than 4 channels/servos.  Some more discussion here : http://www.rcindia.org/chatter-zone/no-wonder-some-people-need-12-and-14-channel-radios-!/

Another example.  In a CCPM glow helicopter, when you push the throttle up, 4 servos move. One is the throttle servo, but 3 other "swash" servos also move with just that one stick movement.

2. Many radios support v-tail mixing.  In your case for a quadrotor, you need 3 v-tail mixers (at least as per the design posted by Sai). The real problem is, you are doing mixing of signals that are coming out of the gyros etc, which is all happening in receiver land !  The v-tail mixing supported by radios, mixes stick positions on the radio, which is useless in your case (as there is no way to feed the output from your gyros etc back into the TX for doing the mixing there, and that too, only ONE mixer typically).

that was a detailed explanation...thanx