PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0008 Page 2-8 Rev. 8, June 2003
the back lighting system to work. The photocell mounted in the unit face will automatically adjust the in-
tensity of the push-button annunciator LEDs.
2.4.9 Unswitched inputs
J3, pin 10 is the unswitched input number 1 and J3 pin 14 is unswitched input 2. These inputs are presented
to the pilot and copilot regardless of the audio configuration, and will always mute the entertainment in-
puts. These 510Ω inputs can be used for altimeter DH audio, GPS waypoint audio, autopilot disconnect
tones, air-to-ground (Flitefone) telephone ringer or any other critical audio signal.
2.4.10 PA Mute (J3, Pin 8)
Pin 18 of J3 is a TTL logic output that is pulled low during PTT operation. This serves as an input to exter-
nal public address system to prevent feedback during transmissions.
2.4.11 Public Address (J3, Pin B)
When the Speaker mode switch is in the PA mode, and the pilot’s PTT is activated, his voice is heard over
the PA speaker output on J3, Pin B. The copilot can continue to use the selected com.
NOTE: Connecting two audio panels to a single speaker for cockpit or cabin ad-
dress can result in weak and distorted audio.
2.4.12 Intercom wiring
See Appendices for intercom connection configurations. It is critical to the proper operation of this system
to have this connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-spec
cable as shown. Connect the shields at the audio panel end only, and tie to the audio low inputs as shown.
2.4.12.1 Push to talk intercom
The PAC24 can be used as an IntelliVox® intercom, or, as a keyed intercom. Switching J3 pin W to
ground will inhibit the IntelliVox® and the intercom squelch will not open until the ICS PTT switch is
activated.
The following pins are used to control the intercom when PTT ICS is desired. Pin 11 must be grounded
through a momentary switch for the pilot to talk on the intercom (with W also grounded). Pin M must be
grounded through a momentary switch for the copilot to talk on the intercom (with W also grounded).
2.4.13 Entertainment Input (J3 Pin 7)
If music or entertainment is desired, a monaural input can be applied to Pin 7 of J3.
NOTE: Use the low level
output of any entertainment device to connect to the audio
panel. Maximum signal level is 2 VAC p-p.
DO NOT use a speaker-level output, this will cause internal damage in the audio
panel.
PS Engineering offers an aviation Compact Disk player, the PCD7100 (Part Number 11952), designed to
interface with the audio panel.
All entertainment devices must be switched off for both takeoff and landing.
2.4.13.1 Entertainment distribution
The entertainment source provides music for all intercom copilot positions. In ISO, it is removed from the
pilot. The PAC24-system incorporates a "Soft Mute" system. This will mute the entertainment devices dur-
ing ICS or radio conversation.
Any signal appearing in the unswitched audio inputs will always mute the entertainment sources, even
though the passengers may not hear the audio tone itself.
(41 páginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais