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PA-400ST Intercom Features
x Completely Portable
x Four Station Capability
x 3-Way Operation: Pilot / Crew / All
x Separate Mic Circuits for Front and Back
x Superior SQL Circuitry
x Dual Volume Control
x On/Off Power Switch
x Back-Lit Control Panel with On/Off Button
x Fail-Safe Feature
x Music In / Cell Phone Jack
x Record O ut Jack
x Push-To-Talk Jacks (2)
x Battery Powered By Two 9V Alkaline Batteries
x Auxiliary Power Jack & Cigarette Power Cord
x Adapter with Inline Fuse for Protection
x Disengage Power Feature
x 3-Year Warranty
2.0 Off/On Power
The intercom is turned on by turning the Pilot’s volume c ontrol clockwise. The control has a definite c lick
when it i s turned on or off. In order to remember to turn the intercom off, many Pilots add a ‘Power off
Intercom’ instruction to their aircraft checklist.
2.1 Squelch (SQL) Setting
The sensitivity of the squelch is controlled by turning the control clockwise (increasing sensitivity) or by
turning the control counter-clockwise (decreasing sensitivity). The squelch can be adjusted to meet even the
most extreme noise levels of aircraft noise. Setting the squelch properly allows the intercom to be active
only when someone speaks into their headset microphone. The inte rcom will become inactive as soon as
they stop speaking. In this manner all extraneous noise in the cockpit is not heard over the m icrophone.
2.2 Three-Way Operation Control
Your intercom is equipped with a 3-way operation control. The three settings allow the intercom to be used
in three of the most common situations encountered in an aircraft. The 3 modes are PILOT / CREW / ALL.
Pilot: This setting is commonly referred to as the Pilot Isolate feature. In this setting the Pilot can isolate
themselves from the Co-Pilot and passengers in the aircraft. The other stations can still hear the Pilot’s
transmission to ATC but they will not be able to distract or interfere with the Pilot. In this s etting, the Co-Pilot
and passengers can communicate with one another
Crew: This setting allows the Crew (Pilot & Co-Pilot) to communicate with one another without any
interference from the passengers. This allows the Crew to not be subjected to any chit-chat or distractions
from passengers. In essence, in this setting the intercom functions as two separate intercoms allowing the
Pilot and Co-Pilot to be on one c ha nnel and the passengers on another.
All: This setting allows all individuals pl ug ged into the intercom to communicate with one another. All
persons can hear and be heard in this setting. All persons will hear ATC transmissions an d can listen to
music if an input source is connected.
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