hi
i am new with rc
i want to built a 72 mhz radio transreciever.
plz send me detail about that

I deleted your new thread, as it was a duplicate of this one.

Please use the "Search" box to see existing threads here about radio designs.  After you have gone through them (and on other sites like rcgroups.com), then seek clarification on specific items. 

Not meaning to discourage you, but seeking out existing information is YOUR responsibility, and you cannot expect others to spoon feed you existing information.