Sigtronics RES-601 Installation Instructions - Manual (Page 4)

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Figure 4
page 4
10. A Sigtronics Stereo-
com system can be
installed for use with
monaural general avi-
ation type headsets.
Follow the installation
instructions as normal
except for the wiring
of the stereo head-
phone jacks. Use the
stereo
headphone
jacks supplied with
the Sigtronics Stereo Switcher but leave the “RING”
connections open. Connect both headphone wires to
the “TIP” of the respective jacks - P4 cable GRAY and
GREEN for the pilot and co-pilot, and BLUE and WHITE
for passengers. See Figure 3 on page 3.
11. Make sure any unused wires are properly insulated and
kept from shorting to any other wires or aircraft ground.
Skip down to the “INSTALLATION CHECK OUT AND
ADJUSTMENT” section on page 5.
INSTALLATION RETROFIT
Follow these instructions if the RES switcher is to be added
to a previously installed SPA-400 or SPA-600:
1. Mount the RES switcher chassis per the “RES-401 / 601
SWITCHER CHASSIS INSTALLATION” instructions on
page 2.
2. Install the MUSIC ON/OFF and PILOT/ALL Switches
and route the harness per the “SWITCHER HARNESS
INSTALLATION” instructions on page 2.
3. Unplug the SPA unit from its wiring harness and insert
connectors J1 and P2 on the RES unit as shown in
Figure
3. Connect remaining plugs per Figure 3 on page 3.
4. Remove the intercom headphone jacks from the pilot,
co-pilot, and passenger positions in aircraft. Wires, which
had been connected to the phone jacks should be cut,
insulated and tied back. If two or more wires appear on
a single jack terminal, they should be cut free of the jack,
then spliced together before insulating and tying back.
Do not disturb the microphone jacks.
5. Replace headphone jacks with three-terminal type
“stereo” jacks supplied with the RES switcher. Connect
wires to the stereo jacks per Figure 3. Terminals on the
stereo phone jacks may be identified per the mic jack
shown in Figure 2 on page 2. The jack bushings (barrel
terminal) must be grounded to the airframe or wired to
aircraft ground. For monaural operation See Note 10
above in the “WIRING INSTRUCTIONS” section.
6. Connect up stereo music source per Figure 3 and Notes
9 and 11 above.
WIRING INSTRUCTIONS
1. Connections should be made as shown in Figure 3 and
Table 1 on page 3.
2. If longer wire lengths are required, use a good quality
multi strand hook-up wire - 22 gauge or larger. Although
not necessary, shielded audio wire can be used if desired.
This can simplify the wiring process.
3. The blue wire from J2 Pin 3 must be connected to the
aircraft radio headphone output - NOT the speaker
output.
4. Connect all intercom mic jack grounds to a single aircraft
chassis ground point - Point “A” - as shown in Figure 3.
Use the black washers supplied to insulate the intercom
mic jacks from aircraft chassis ground. NOTE: this
intercom central grounding point is used to eliminate any
unwanted electrical noises, such as alternator whine
or strobe noise, from being induced into the intercom
system through the grounds. All intercom mic jack barrels
must be insulated from ground where they are mounted
and connected back to Point “A” on their own individual
ground wire. Similarly, both intercom ground wires (J2
pin 4) and the push-to-talk switch grounds must also be
connected back to Point “A”. It is not necessary, however,
to connect the headphone jack barrels to Point “A”. They
can either be grounded where they are mounted or some
place nearby.
5. The red wire may be connected to either 12V (14V) or
24V (28V) power source. No switching or adjustments
are required to operate from either source.
6. Tan wires (J2 pins 8, 9, 13, and 14) are only used on
installations that require extra intercom positions. Tan
wires pins 13 and 14 are provided on ST-600 units only.
7. Do not cut and shorten J1 cable. Coil and secure any
excess cable.
8. If the aircraft has existing push-to-talk switches they must
be disconnected from wherever they are currently and
connected exactly as shown in Figure 3.
9. The wires used in the stereo music input cable (J3)
depends on the type of stereo used. Use the White/Violet,
White/Brown, Yellow, and White/Yellow wires for stereos
with speaker outputs (25 watts per channel maximum).
Use the Violet, Black, and Orange wires for a Line Level
or Headphone Level (Walkman) output. A small stereo
panel mount music jack is provided for portable stereo
input, if desired. Connect the Violet, Black, and Orange
wires to the jacks terminals as shown in Figure 4 on this
page. Drill a 1/4 inch hole and mount the jack on the
aircraft panel. To use, connect an adapter cable between
the music input jack and the output of the portable stereo.
Suitable cables are available at your local Stereo or
electronics store as well as from Sigtronics.