According to the ICAO Doc 9432 Manual of Radiotelephony the following transmitting techniques will assist in ensuring that transmitted speech is clearly and satisfactorily received:
- Before transmitting, listen out on the frequency to be used to ensure that there will be no interference with a transmission from another station.
- Be familiar with good microphone operating techniques.
- Use a normal conversational tone, speak clearly and distinctly.
- Maintain an even rate of speech not exceeding 100 words per minute. When it is known that elements of the message will be written down by recipient, speak at a slightly slower rate.
- Maintain the speaking volume at a constant level.
- A slight pause before and after numbers will assist in making them easier to understand.
- Avoid using hesitation sounds such as “er”.
- Depress the transmit switch fully before speaking and do not release it until the message is completed. This will ensure that the entire message is transmitted.
- An irritating and potentially dangerous situation in radiotelephony is a “stuck” microphone button. Operators should always ensure that the button is released after a transmission and the microphone placed in an appropriate place that will ensure that it will not inadvertently be switched on.