microphone position can drastically reduce the intelligibility of the message being
Proper microphone technique is important in radiotelephone communications.
Transmissions should be concise and in a normal conversational tone. Consider the
following suggestions for proper technique:
Speak clearly and distinctly.
Avoid extremes of voice pitch.
Use standard phraseologies to the maximum extent practical, but do not be
afraid to use plain language where no precedence has been set.
Shield your mike from outside noises.
Keep your mike a sufficient distance from an associated speaker to avoid
In radiotelephone communications, the operator of the equipment becomes part of the
system. Along with the power and efficiency of the equipment, the manner in which the
message is delivered determines the effectiveness of the transmitted signal.
Voice Recorders and Reproducers
Recorders in ATC facilities record conversations between controllers and aircraft. These
recordings are used for determining adequacy and accuracy of ATC instructions;
conducting aircraft incident/mishap analysis; immediate playback for assistance in
search and rescue efforts; periodically evaluating circuit loads; and for voice training,
evaluation, and quality control of ATC personnel. The most commonly used recorder at
Navy ATC facilities is the Digital Audio Legal Recorder (DALR).
NATOPS Air Traffic Control Facilities Manual, NAVAIR 00-80T-114, charges the
electronic maintenance division with the maintenance and custody of recorders and
tapes. However, you may be assigned to make a written transcript or a re-recording of
an original recording.
Digital Audio Legal Recorder (DALR)
The DALR provides the legal recording capability between air traffic controllers, pilots,
and ground-based air traffic control Terminal RADAR Approach Controls (TRACON)
DALR replaces and updates obsolescent equipment at current FAA and DOD sites. It
provides additional automation and incorporates the latest requirements for information
security, safety, and remote maintenance monitoring.
The DALR System is comprised of a number of components, both software and
hardware, that work together to deliver the required functionality of the recording system
(see Figure 5-3).