but still, i was thinking about a wireless controlling system for my craft...i do not have any computerised radio system, with 18 or 20 channels...no hydraulic pumps...no powerfull motors...no lathe works...and alone...so , for testing i used some toy rc systems...then, keeping in mind, my need,as 6 channels, i converted a toy rc system in to RADIO MATRIX MODE, to get a 6 channel by same carrier wave...so i made a simple audio coded PWM, system in my RC system...after some trial and errors method it started work flawlessly...so i got the control system...and i choose 4 power transistorised output system,in final stage of my transmiter...i do not know the exact range of transmission from TX,but i tested it with my Pachu,my student boy, as i fixed the reciever on his bicycle,and a motor, then send him on...after reaching a culvert, he called me in phone..there is a booth near to culvert...
so the culvert is situated 2.5 kms from my grand home...then it worked without any trouble...so i got enough confidence with it...