Clearly audible and understood. More radio slang. Also an answer to the question "Do you copy?"

obviously...you understand

Affirmative. Originally used over the radio to signify that you heard the other - you guessed it - 'loud and clear', the term now simply means "Yes, I understand you, now kindly leave me alone."

Obvious; when something is "in-your-face" and apparent.

Used in radio communications to report that the communications link is working properly.