Sigtronics SPA-4SN Installation Instructions - Manual (Page 3)

SPA-4S INSTALLATION DRAWING
POINT
AIRCRAFT/INTERCOM INTERFACE AREA
MIC AUDIO
HEADPHONE AUDIO
TIP
TIP
RING
RADIO MIC KEY
AIRCRAFT RADIO
12345
PORTABLE STEREO
AIRCRAFT CHASSIS GROUND. 2.)
NOTES
1.) IF PILOT PTT SWITCH IS CONNECTED
TO THE AIRCRAFT HAND MIC JACK,
IT MUST BE DISCONNECTED AND
CONNECTED TO THE WHITE/RED
WIRE AS SHOWN.
P2
J2
J2 (4) WHITE/BROWN
J2 (5) BLACK
J2 (6) WHITE/VIOLET
MUSIC
INPUT JACK P1
J1
J1 (2) WHITE/RED
J1 (1) WHITE/BLACK
J1 (11) WHITE/ORANGE
J1 (3) BLUE
J1 (6) BROWN
J1 (10) WHITE/BLUE
J1 (9) TAN
J1 (5) WHITE
J1 (8) TAN
J1 (4) BLACK J1 (7) RED
J2 (1) GREEN J2 (2) WHITE/GREEN
TO TO
BARREL
TIP RING
TO
BARREL
TIP
PASSENGER 1
BARREL
TIP RING
BARREL
TIP
TO
CO-PILOT
RING
BARREL
TIP
PILOT
BARREL
TIP
TO
RING RING RING
PASSENGER 2
BARREL
TIP RING
BARREL
TIP
TO
RING
SPA4SINS.DWG 9/27/2000
Stereo Intercom
VOL SQ ON
SPA-4S
HEADPHONE
TO AIRCRAFT
POWER BUSS
12/28 VDC
(INTERCOM
CENTRAL
GROUND
POINT) AIRCRAFT
HEADPHONE
JACK
AIRCRAFT
HAND MIC
JACK
PILOT
PTT SWITCH
CO-PILOT
PTT SWITCH
SPA-4S
INTERCOM
HEADPHONE
JACK
MIC
JACK
HEADPHONE
JACK
MIC
JACK
HEADPHONE
JACK
MIC
JACK
HEADPHONE
JACK
MIC
JACK
RADIO RECEIVE
ADJUST
A A
A A A A
A
BARREL
TIP
RING
INTERCOM
CIRCUIT
BREAKER
(1 AMP)
Figure 4
page 3
the aircraft panel. This is done by unscrewing the two Phillips head screws
and the nut on the ON/OFF switch. Remove the printed SPA-400 panel.
Pull the SPA-400 unit out and unplug the white connector from the wiring
harness. Finally mount the SPA-4S chassis (see Figure 2 on page 2):
1. Remove the knobs from the Volume and Squelch controls using a 0.050”
Allen wrench. Remove the nut form the ON/OFF switch. NOTE: DO NOT
REMOVE the nuts from the Volume or Squelch (VOL/ SQ) controls.
2. Insert the SPA-4S unit from the rear of the aircraft panel with the
appropriate arrow on the unit chassis pointing upwards.
3. Install the printed SPA-4S panel and lightly thread the two 4-40 screws
through the holes in intercom panel. The nuts on the Volume/Squelch
controls should fit inside the aircraft panel holes.
4. Tighten the two screws
5. Put the knobs on the Volume and Squelch control shafts, tighten the Allen
screws, and switch nut.
Wiring Change
The wiring changes to an existing SPA installation are as follows. Re-wire
the pilot, co-pilot, and passenger(s) headphone lines. You will not need the
4-foot intercom / aircraft interface cable (12 pin) that comes with the SPA-
4S system. You will use the SPA harness already in the aircraft and the 4-foot
headphone / music interface cable (6 pin). In a SPA-400 installation, the tip
terminals of the pilot, co-pilot, and passenger headphone jacks are wired to
the blue wire (pin 3). They need to be disconnected from there, the mono
headphone jacks need to be replaced with the supplied stereo headphone
jacks and connected to their respective pins on the headphone / music
interface harness. (See Figure 4 on page 3) Make sure that the blue wire (pin
3) is still connected to the tip of the radio headphone line. Wire the music
input as shown in Figure 4 on page 3.
MONO MUSIC
Rewire the headphone jacks as shown in the installation wiring diagram. For
mono music you can use the existing jacks. Connect the green P2(1) and the
white/green P2(2) to tip terminal of the phone jacks.
NOTE: Make sure that the blue headphone wire from the original SPA-400
installation is not connected to the headphone jacks tip connection and
is connected to the aircraft audio panel or radio as shown in figure 4 on
page 3.
TABLE 1 - P1/J1 - See Wiring Instructions
PIN WIRE COLOR FUNCTION CONNECT TO
1 White/Black Pilot Mic Input Ring Terminal of Pilot Mic Jack
2 White/Red
Pilot Transmit Switch
Input Pilot Transmit Switch (PTT) (Switch
to Ground to Transmit)
3 Blue *1 Radio Headphone Input Radio Headphone Output
4 Black *2
Intercom Central
Grounding Point “A” Aircraft Chassis Ground
5 White
Radio Transmit Key
Output Tip Terminal of Aircraft Hand Mic
Jack, or Key Input of Aircraft Radio
or Audio Panel
6 Brown
Transmit Mic Audio
Output Ring Terminal of Aircraft Hand Mic
Jack or Mic Input of Aircraft Radio
or Audio Panel
7 Red *3
12 through 28 VDC Power
Input Intercom Circuit Breaker
8 Tan *4
Passenger #1 Mic Input Ring Terminal of Passenger #1
Intercom Mic Jack
9 Tan *4
Passenger #2 Mic Input Ring Terminal of Passenger #2
Intercom Mic Jack
10 White/Blue
Co-Pilot Transmit Switch
Input Co-Pilot Transmit Switch (PTT)
(Switch to Ground to Transmit)
11 White/Orange Co-Pilot Mic Input Ring Terminal of Co-Pilot Mic Jack
12 Violet *7 ICS PTT ICS PTT Switches
TABLE 2 - P2/J2 - See Wiring Instructions
PIN WIRE COLOR FUNCTION CONNECT TO
1 G reen *6
Intercom Right
Headphone Output Tip Terminal of Headphone Jack
2
White/Green
*6 Intercom Left Head-
phone Output Ring Terminal of Headphone Jack
3 NC None No Connection
4
White/Brown
*2 Music Input Left Channel Left Music Source Headphone or
Line output
5 Black *5
Music Input Common Music Source Common Headphone
or Line Output
6
White/Violet
*5 Music Input Right
Channel Right Music Source Headphone or
Line Output