The Sigtronics’ Audio Switcher enables the pilot
and passengers to listen to any programmed
entertainment, such as AM/FM radio, stereo or
monaural recorded music without missing transmissions from ATC, flightwatch, or traffic!
SWITCHING: The pilot is automatically switched from the audio bus
of his entertainment system to the VHF radio when a radio message is
received or transmitted and is switched back when the radio traffic is
completed.
OPERATING MODES: Several modes of operation are possible.
The pilot may listen to entertainment and be switched to the VHF, or
he may elect to remain on the VHF. He also has the option of putting
the passengers on uninterrupted music or letting the VHF interrupt
their music so they may hear the radio communications. (See Mode
Selection Table)
RADIO MONITORING: The “fail-safe” design assures that the pilot
will always receive the VHF, regardless of the position of the Switcher
controls.
HEADPHONES: High or low impedance headphones may be used
with the Switcher, however, all headphones being used
simultaneously should be of the same impedance and efficiency. This
assures that the audio volume will be the same for all persons.
CONFIGURATIONS: The Audio Switcher is available in four
configurations:
1. 12V stereo 2. 24V stereo
3. 12V monaural 4. 24V monaural
COMPATIBILITY: The Audio Switcher interfaces with virtually
any entertainment speaker output circuit.
Stereo Switchers - Compatible with stereo entertainment
systems and stereo headphones.
Monaural Switchers - Compatible with monaural entertainment
systems and monaural headphones.
Aircraft headphones or headsets may be used as monaural
units.
WARRANTY: The Audio Switcher is built of high quality
commercial components and carries a one year parts and labor
warranty.
SPECIFICATIONS
WEIGHT: 11 ounces with cables and accessories.
SIZE: 4” x 2.9” x 2”
POWER: Utilizes aircraft power. 12V or 24V available.
POWER SWITCH: Turns Switcher “ON” and “OFF”.
PILOT/ALL SWITCH: Selects who is to be switched, when
wired as shown in Figure 1. (See Mode Selection Table)
HEADPHONE JACKS: Accept standard .250” stereo headphone plugs in stereo units and .250” phone plugs in monaural
units.
MUSIC INPUT: The Switcher provides loading so that your
entertainment system output will not be open circuited. This
eliminates the possibility of harming any music system.
SIGTRONICS CORPORATION
178 East Arrow Highway
San Dimas, CA 91773
PHONE (909) 305-9399
INSTALLATION INSTRUCTIONS: Please read the following instructions carefully
PLUG
PIN NO.
1 Red Power Input
2 Black Ground Aircraft Chassis 8 White/Black
3 White XMIT Music Disable Tip of Aircraft Mic Jack 9 *Yellow
4 Blue
5 Violet
6 Orange
CHASSIS INSTALLATION
Four 6/32” screws with self-locking nuts have been provided for
mounting the chassis to the aircraft.
1. Remove the unit from the case.
2. After selecting a suitable mounting location in the aircraft, drill
aircraft and switcher case with same hole pattern. Use a No. 27
drill (Clearance drill for 6/32”).
3. Secure case to the aircraft with the screw heads Inside
switcher case for circuit board clearance.
WIRE
COLOR
FUNCTION CONNECT TO:
Aircraft circuit breaker thru
ON/OFF switch
Input
Radio Headphone
Interrupted Output
†(Lt. Channel)
Interrupted Output
†(Rt. channel)
Output Jack
Aircraft Radio Headphone
Pilot’s Headphone Jack Tip
Terminal
Pilot’s Stereo Headphone
Jack Ring Terminal
PLUG
PIN NO.
7 *Brown
10 Green
11 Grey Audio Ground
Note: * Stereo Switchers, only
‡ Relevant to Stereo Systems TABLE 1
WIRING INSTRUCTIONS
Four feet of cable has been provided to connect the unit to the
aircraft and entertainment system.
Figure 1 illustrates the connections to be made. Table 1 lists the
connector plug pin numbers, the color, function, and destination of
each wire connected to those pins.
Connections should be made as shown in Figure 1 and as
indicated in Table 1. Sigtronics should be contacted if other means
of connecting the unit are contemplated.
4. Replace the unit in the case and secure.
OPERATING INSTRUCTIONS
Step 1. Turn aircraft radio “ON” and adjust squelch (if manual)
and volume to suitable listening level.
Step 2. Turn Audio Switcher and entertainment system “ON” and
adjust entertainment to suitable listening level.
Step 3. Select Pilot or All position to suit switching mode desired.
Note: The Switcher controls can be changed from one
mode to another at any time.
TRANSMIT: Transmitting is accomplished in the conventional
manner, by using the hand-held microphone. Messages are
received via the headphones being worn.
If the pilot has a headset with a boom microphone and uses a
push-to-talk switch, then the headset microphone plug should be
connected to the aircraft microphone jack and the headphone plug
should be connected to the Switcher Headphone Jack.
WIRE
COLOR
FUNCTION CONNECT TO:
Uninterrupted Output
† (Rt. channel)
Uninterrupted Output
† (Lt. channel)
Audio Input
† (Rt. channel)
Audio Input
† (Lt. channel)
Pilot/All Mode Selector
Switch
Pilot/All Mode Selector
Switch
Right channel Audio
Output of Stereo System
Left channel Audio Output
of Entertainment System
Entertainment System
Audio Ground
REM-AS-1
PILOT/ALL
SWITCH
PILOT ON VHF Interrupt Music
ON/OFF
SWITCH
PILOT HEARS PASSENGERS HEAR
Music Only
ALL ON VHF Interrupt Music VHF Interrupt Music
*MODE SELECTION TABLE
PILOT OFF
ALL OFF
VHF Only Music Only
VHF Only VHF Only
*Applicable when wired
as shown in Figure 1.
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