PS Engineering PAC24 Especificações descarregar pdf (Página 25)

PS Engineering

PAC24 Series Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-240-0010 Page 3-2 Rev. 25, Feb. 2015

problem.

3.4 Communications Selection (2)

There are 10 pushbuttons associated with the communications transceivers. The lower buttons control

which transceiver is selected for transmit.

The PAC24 gives priority to the pilot’s PTT. If the copilot it transmitting, and the pilot presses his PTT, the

pilot’s microphone will be heard over the selected com transmitter.

The PAC24 has an automatic selector mode. Audio from the transceiver selected by the Xmit button is au-

tomatically heard in the headsets and speaker (if selected). You can check this function by switching from

COM 1 to COM 2 and watch the selected audio light on the selector change from COM 1 to COM 2. This

ensures the pilot will always hear the audio from the transceiver he is transmitting on.

When switching from COM 1 to COM 2, while COM 2 audio had been selected, Com 1 audio will continue

to be heard. This eliminates the pilot having to switch Com 1 audio back on, if desired.

When switching from COM 1 to COM 2 while Com 2 has NOT been selected, Com 1 audio will be switched

off. In essence, switching the mic selector will not effect the selection of Com receiver audio. This is true

of all transmitter selections.

3.4.1 Telephone Operation

In a single installation, the intercom mode select switch determines who is on the phone:

ISO - pilot

CREW - pilot and copilot (passengers if IntelliPAX expansion NOT present)

ALL - pilot, copilot, passengers

In a standard dual installation, the pilot and copilot can select TEL mode independent of each other by

pressing their respective COM5 XMT button. The passengers are on the phone only when the pilot has se-

lected TEL (Com 5) mode and his switch is in the ALL position. The copilot cannot put the passengers on

the phone, and the passengers can only get on the phone when the pilot is on the phone. In an observer dual

installation, the crew box works like a single installation.

The observer is treated like a passenger, so he would be on the phone line when COM5 XMT is selected

and the intercom switch is in ALL mode. The observer cannot select telephone mode independently.

NOTE: Selecting the COM 5 –TEL– mode will disable pilot and copilot intercom, as the intercom circuit is

transferred to the telephone use. However, sidetone will be present.

3.4.2 Stuck Microphone Protection

The PAC24 has a function designed to prevent unintentional radio transmissions and blocked frequencies.

After 35 seconds of continuous PTT on any input, the PTT line is lifted, and will remain unkeyed until the

PTT input is recycled.

3.4.3 Swap Mode (Remote transfer of com transceivers)

With a yoke mounted, normally open, momentary switch, the pilot can change from the current Com trans-

ceiver another by depressing this switch. Activating the swap switch will select the next transceiver, cy-

cling from 1 to 2 to 3 etc.

3.4.4 Observer transmit selection (part number –0400 series).

If the installation uses a dual panel, observer configuration, the crew panel serves the pilot and copilot,

while the second audio panel serves the observer.

The pilot and copilot have access to all transceivers. The observer can access any radio but the crew will

have transmit priority. If the crew selects a radio for transmit that the observer has previously selected, all

parties can transmit, but the pilot, copilot, have priority over the observer (in that order).

The crew has priority on all radios. The observer can listen to all radios if desired.

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