Guys thank you very much for such a great explanation.

LNEWQBAN> Both links are great I'm gonna read up on that.

ameyam-> Thanks for your sharing, but I have not mentioned or asked anywhere about the interference, as far as 72 Mhz is concerned yes, we have to use the pin boards where every channel's chart is there, so those who are using 72 Mhz they know which frequency is being used on which channel so there is no way of conflict or interference, and it's also verbally asked, and 2.4 Ghz not to worry.

Thank y'all

Mody