Sigtronics SPA-4S Installation Instructions
Specialists in “SOUND” Management
178 East Arrow Highway, San Dimas, CA 91773 ( 909 ) 305-9399
INTRODUCTION
ATTENTION INSTALLER: To assure a trouble free installation,
please read the entire instructions through once before
beginning.
SPA-4S SYSTEM SPECIFICATIONS
CONFIGURATION – The Sigtronics SPA-4S Intercom system is specifically
designed for permanent, panel mounted installation in aircraft. The SPA-
4S provides voice activated (VOX) intercom and music input for up to four
headset positions in a small single chassis unit.
UPGRADE – A SPA-4S can upgrade an existing SPA-400 installation
requiring minimal re-wiring.
STEREO MUSIC INPUT – Music input accepts standard portable music
headphone or line level outputs. Automobile
Speaker level outputs can be adapted for use with SPA-4S systems.
COMPATIBILITY – Sigtronics SPA-4S intercoms have been designed to
operate with all standard general aviation aircraft radios and headsets.
SIZE: Panel 1” x 2.5”. Chassis - 1” high x 2.5” wide x 4” deep.
Can be mounted either horizontally or vertically in the aircraft panel.
WEIGHT: 5.5 ounces (SPA-4S intercom unit with panel and knobs). Jacks
and wiring harness weigh 7.0 ounces
INPUT POWER: 11 VDC through 32 VDC. Maximum current drain 0.11
Amps
DISTORTION: Less than 1% total harmonic distortion.
WARRANTY: SPA-4S intercoms are constructed of high quality components
and carry a five year parts and labor warranty.
HARDWARE SUPPLIED
Besides the intercom unit and instructions, each SPA-4S system comes
with the following hardware:
Headphone Output Jacks - Accept standard 0.250” aircraft
stereo headphone plugs. .......................................................................................... 4
Microphone Input Jacks - Accept standard 0.206” aircraft
microphone plugs. (U93 plug compatible jacks can be used in
place of the jacks provided – monaural installations only). ......................... 4
Mic Jack Insulating Washers, Flat ........................................................................... 4
Mic Jack Insulating Washers, Shoulder ................................................................ 4
Intercom Panel - lettered on both sides. ............................................................. 1
Intercom Control Knobs ............................................................................................ 2
Mounting Screws 4-40 x 1/2 .................................................................................... 2
Drill Template - Adhesive backed hole size pattern for
drilling aircraft panel. ................................................................................................. 1
Intercom / Aircraft Interface Cable (4 feet long) .............................................. 1
Headphone / Music Interface Cable (4 feet long) ............................................ 1
Stereo music input jack 3.5mm .............................................................................. 1
MUSIC MUTE OPTIONS
FACTORY DEFAULT - PARTIAL MUSIC MUTE DURING ICS - When listening
to music and someone speaks on the intercom the default factory operation
is to partially mute the music so you can hear the conversation. The SPA-4S
intercoms have one additional option that can be enabled if desired. This
option is enabled with the intercom removed from the aircraft.
FULL MUSIC MUTE DURING ICS OPTION - The music can be completely
muted during intercom conversations. To enable this option, small jumper
wires are installed on the solder side of the circuit board.
HIGH NOISE VERSION
Model SPA-4SN – The “N” version of the SPA-4S has all the above features
but is specifically configured for very high noise environments such as
open cockpit aircraft, warbirds, and ultralights. In addition to special
circuitry that improves intercom performance in high noise aircraft, the
SPA-4SN has a Push-to-intercom mode for applications where voice
activated (VOX) intercom operation is not desired.
CHASSIS INSTALLATION
To upgrade an existing SPA-400 installation to a SPA-4S skip to the
“UPGRADING A SPA INSTALLATION TO A SPA-4S” section on page 2. For a
completely new intercom installation, continue below.
UNIT PLACEMENT
The SPA-4S unit has been designed to mount either horizontally or
vertically in your aircraft panel. The location selected for the SPA-4S unit
requires a minimum front panel area of 2 1/2” by 1”. Depth required behind
panel is 4” plus cable access.
CAUTION: Move the aircraft flight controls through the limits of travel while
observing the selected area and making sure that the rear of the intercom
and cable will not interfere with any aircraft control components.
PANEL PREPARATION:
1. Position the adhesive drill template on the aircraft panel in the selected
area.
2. Center punch each hole at the cross lines. (Five holes are in a straight line
and equally spaced 0.4” apart)
3. Drill 1/8” pilot holes in all five places.
4. Enlarge holes to 1/4” and 3/8” per the template.
igtronics
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