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SPA-600N INSTALLATION AND OPERATING INSTRUCTIONS (For Very High Noise Applications) - page 2 / 2

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AIRCRAFT / INTERCOM INTERFACE AREA

TO AIRCRAFT POWER BUSS 12 / 28 VDC

INTERCOM CIRCUIT BREAKER ( 1 AMP )

POINT A

( INTERCOM CENTRAL GROUND POINT )

TIP

AIRCRAFT HEADPHONE JACK

RING

TIP

HEADPHONE AUDIO MIC AUDIO RADIO MIC KEY

AIRCRAFT HAND MIC JACK

AIRCRAFT RADIO 12345

ON

VOL

INTERCOM

SPA-600

SQ

SPA-600N INTERCOM

TO A

TO A

PUSH-TO-INTERCOM SWITCHES (1 PER HEADSET)

P1

J1

(12) VIOLET

(7) RED

(14) TAN

(4) BLACK

(13) TAN BLUE

PILOT HEADPHONE JACK

BARREL

  • (3)

    BLUE

  • (1)

    WHITE / BLACK

  • (6)

    BROWN

  • (5)

    WHITE

  • (2)

    WHITE / RED

  • (10)

    WHITE / BLUE

  • (11)

    WHITE / ORANGE

  • (8)

    TAN

  • (9)

    TAN

TIP

RING

TIP

TO A

BARREL

PILOT MIC JACK

PILOT

CO-PILOT

PTT SWITCH

PTT SWITCH

TO A

TO A

TIP

RING

TIP

TO A

CO-PILOT

CO-PILOT

HEADPHONE JACK

MIC JACK

BARREL

BARREL

HEADPHONE

MIC

HEADPHONE

MIC

HEADPHONE

MIC

HEADPHONE

MIC

JACK

JACK

JACK

JACK

JACK

JACK

JACK

JACK

TIP

RING

BARREL

PASSENGER 4

TO A

TIP

BARREL

SPA-600N Installation Drawing

TIP

RING

BARREL

PASSENGER 1

TO A

TIP

BARREL

TIP

RING

BARREL

PASSENGER 3

TO A

TIP

BARREL

TIP

RING

BARREL

PASSENGER 2

TO A

TIP

BARREL



                        



  

Figure 4

1

White / Black

Pilot Mic Input

Ring Terminal of Pilot Intercom Mic Input Jack

2

White / Red *A

Pilot Transmit Switch Input

Pilot Transmit Switch (PTT) (Switch to Ground to Transmit)

3

Blue *B

Headphone - Radio and Intercom Outputs

Radio Headphone Output and all Headphone Jacks

4

Black *C

Ground

Hand Mic Jack Ground Terminal (Point A)

5

White *D

Transmit Relay (Key) Control Output

Tip Terminal of Aircraft Mic Jack or Key Input of Aircraft Radio or Audio Panel

6

Brown

Mic Audio Output

Ring Terminal of Aircraft Mic Jack or Input of Aircraft Radio or Audio Panel

7

Red *E

12 VDC through 24 VDC Power Input

Intercom Circuit Breaker

8

Tan

Passenger #1 Mic Input

Ring Terminal of Passenger #1 Mic Jack

9

Tan

Passenger #2 Mic Input

Ring Terminal of Passenger #2 Mic Jack

10

White / Blue

Copilot Transmit Switch

Copilot Transmit Switch (PTT)

11

White / Orange

Copilot Mic Input

Ring Terminal of Intercom Copilot Mic Input Jack

12

Violet

Push to Intercom Input

Push to Intercom Switches

13

Tan

Passenger #3 Mic Input

Ring Terminal of Passenger #3 Mic Jack

14

Tan

Passenger #4 Mic Input

Ring Terminal of Passenger #4 Mic Jack

MOUNTING CHASSIS (continued)

  • 5.

    Install panel and lightly thread nut on to ON-OFF switch. Nuts and washers on Volume and Squelch controls should fit inside the 3/8” diameter holes.

  • 6.

    Select two 4-40 screws through holes in intercom panel. Tighten ON- OFF switch nut.

  • 7.

    Install knobs on Volume (VOL) and Squelch (SQ) control shafts using .050” Allen wrench.

MOUNTING HEADPHONE AND MICROPHONE JACKS:

  • 1.

    Select mounting areas. (One mic and one headphone jack for each headset). Again, make sure the jacks will not interfere with aircraft control components.

  • 2.

    Drill 3/8” diameter holes for headphone jacks and install.

  • 3.

    Drill 1/2” diameter holes for mic jacks and install with insulating washers supplied. (See Figure 3).

WIRING INSTRUCTIONS Connections should be made as shown in Figure 4 and indicated in Table 1 *A. White / red (pilot push-to-talk) must correspond with white / black (pilot

mic input) as shown. *B. The blue wire from Pin 3 must be connected to the aircraft radio

headphone output- NOT the speaker output. *C. Connect all intercom mic jack grounds to Point A as shown in Figure

4. (Use black washers supplied to insulate intercom mic jacks from aircraft chassis ground). *D. Do NOT connect transmit switches to white (key) wire. *E. Red wire may be connected to either 12 (14V) or 24 (28V) power

source. No switching or adjustments are required to operate from either source. *F. Tan wires from Pins 8 and 9 are only used on 4-way installations.

FINAL CHECKOUT AND ADJUSTMENT After the unit is installed, again check that the intercom chassis, jacks, and wiring harness are clear of all aircraft operating controls and cause no interference with them. Check out the intercom functions by following the Operating Instructions. It may be necessary at this time to adjust the intercom mic output to the aircraft radios. A small, square, adjustable trimmer potentiometer is provided inside the unit for this purpose. It is accessible through a hole in the side of the case, marked “Mod. Adj.”, and can be adjusted with a screwdriver. In the event of over modulation (garbled) or reports of weak transmissions over the aircraft radio, an appropriate adjustment can be made. Clockwise rotation increases the output level to the aircraft radio mic input. Counter-clockwise rotation decreases modulation level. This adjustment sometimes needs to be made after initial installation of the

Connect To:

intercom or if a new radio is installed. (The output is set for unity gain at Sigtronics.) Weight: Intercom with panel and knobs (4.5 oz.)

Jacks and wiring harness (12.5 oz. maximum) Current Draw: 0.07 amps @ 28 volts

FAA TSO: C50b ENV. CAT (DO-160) CFBBBX

spa-600n.pdf

1-8-2007

Form SPA-600N-IS

REV B

Plug Pin #

Wire Color

Table 1

Function

15

  • *

    See Wiring Instructions

No Connection

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