Radio Check = What is my signal strength? Loud and clear, or, scratchy, or broken, respond as appropriate.
Go Ahead = You are ready to receive transmission.
Stand-by = You acknowledge the other party, but are unable to respond immediately.
Roger or Ten Four = Message received and understood.
Negative = Same as "No".
Affirmative = Same as "Yes". Avoid "yup" or "nope" as they are difficult to hear.
Say Again = Re-transmit your message
Over = Your message is finished.
Out = All conversation is finished, you are signing off and the channel is clear for others to use.
Break, Break, Break = You are interrupting in the middle of communication because you have an emergency.
Read you loud & clear = Response to "Radio Check". Your transmission signal is good.
Come in = You are asking the other party to acknowledge they hear you.
Copy = You understand what was said.
Wilco = Means "I will comply".
Repeat = Used when repeating something. Example - "I require 5 gallons, repeat 5 gallons of diesel.”
May Day = Distress call. Repeat 3 times, and again after each transmission.
These terms can be combined such as "Roger Wilco" means "I understand and will comply", or "Over and Out" means "I've finished talking and I'm signing off".
