Speechless Code

The speechless code is used in situations where you are unable to transmit speech, for example a microphone failure, or perhaps on very short final when you would rather concentrate on the job in hand than respond to a transmission.
Transmit Morse Meaning
One short    '  (E) Yes
Two short    ' ' (I) No
Three short    ' ' ' (S) Say again
Four short    ' ' ' ' (H) Request homing
One long    - (T) Manouevre complete, steady on heading
One long, two short, one long    - ' ' - (X) My aircraft has developed another emergency