PTT Switches for
1-2 places
Optional
HEADSET JACKS
for 2-4 Places
Aircraft Radio
Optional Audio Panel
MUSIC
Optional
ALL
ISO
Squelch
Front Panel
Volume
Microphone
Jack
Headphone
Jack
Standby Jacks
Model 403mc Voice Activated INTERCOM
1
INSTALLATION/OPERATION MANUAL
PLEASE READ THIS MANUAL THOROUGHLY
BEFORE USING THE INTERCOM
and consult with your A & P Mechanic or Certified
Repair Station prior to installation.
OPERATING PROCEDURES
Plug headsets into the proper intercom jacks. When using
stereo headsets, put the stereo/mono switch in the mono
mode. Turn on the aircraft master switch and avionics master,
if so equipped.
Initially set the intercom volume control to the 11 o’clock
position and the squelch control to the 3 o’clock position. Turn
up each headset volume all the way and position your boom
mic 1/8" from your lips and at the corner of your mouth for
best results. Noise canceling mics will not operate correctly if
they are more than 1/8" from your mouth. While speaking
loudly, adjust the intercom volume control to a comfortable
listening level.
SYSTEM OVERVIEW
The Flightcom Model 403mc intercom is a monaural unit compatible with most
aviation headsets. Installation of up to four stations is possible using optional
jacks. The unit provides two station radio transmit capability.
Fig. 1 Typical Connection Configuration
Fig. 2 Correct Placement of Boom and Mic
Squelch Control: The squelch control should be set as far clockwise as possible while still blocking the background noise. When adjusting
the squelch, be sure no one is talking. Re-adjust this setting in flight to compensate for different noise levels.
Note: If the squelch is set too high (counter-clockwise) your voice will be cut out unless you talk very loudly. If the squelch is set too low
(clockwise) the background noise will be heard occasionally.
ZERO to 1/8"
from mouth
