Radio communication

Do you read ? - means I have called you more than once, if you are receiving me, reply.

How do you read me - means 1 : unreadable, 2 : readable now and then, 3 : readable with difficulty, 4 : readable, 5 : perfectly readable.

Negative - means No.

Over - means my transmission is ended. I expect a reply from you.

Out - means my transmission is ended. I do not expect a reply from you.

Roger - means Okay, I have received your message.


UHF : 0.3 to 1 GHz
C band : 3.9 to 8 GHz
K : 8 to 16 GHz
Ku : 12.5 to 18 GHz
L : 1 to 1.5 GHz
S : 1.5 to 39 GHz
X : 8 to 12.5 GHz, used in mobile Radars.