Sigtronics SPA-4Si - Manual

Sigtronics Dual Bus Kit Installation & Operation 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.
The Sigtronics Dual Bus Kit includes two Model SPA-4Si intercoms
specifically designed for permanent installation in aircraft using dual
(separate) audio buss’ systems (i.e. aircraft with two audio panels).
The SPA-4Si units allow each pilot, operating separate radios, the
convenience of voice activated inter cabin communication. In addition
to operating their respective radio systems independently, the SPA-4Si
units add independent music inputs and full stereo aviation headset
capability. Optional passenger connections allow intercom and stereo
music positions with radio receive — No radio transmit.
The kit consists of two SPA-4Si intercoms (with the option of adding up
to 4 more SPA-4Si units) each with their own operating controls and
radio interface. An interconnect line allows intercom communication
between the units yet keeps the VHF audio systems separate. When
transmitting through their respective radios, each side will hear
the other’s transmission unless transmitting simultaneously. Radio
transmission is also possible through either unit even when the units
are “OFF.”
The SPA-4Si units may also be used as a dual intercom system in aircraft
without dual audio panels. This is convenient where it is desired to
have separate conversations between pilots and passengers. Contact
Sigtronics for information.
GENERAL FEATURES AND SPECIFICATIONS
Voice Activated: Allows “hands free” intercommunication between
pilot(s) and passengers. Start speaking and the intercom instantly turns
on to relay your message clearly to the other headsets; stop talking and
it turns off to reduce background noise. There is no need to raise your
voice or turn your head anymore!
Transmit Capability: Both pilot and co-pilot can transmit to air traffic
control via push-to-transmit switches and headset boom microphones.
The intercom function is automatically disabled during transmit, so that
only the voice of the person transmitting can be heard.
Radio Monitoring Capability: Radio output can be heard whether
intercom power switch is “ON” or “OFF.”
DUAL BUS KIT SYSTEM SPECIFICATIONS
CONFIGURATION – The Sigtronics Dual Bus Kit Intercom system is
specifically designed for multiple audio bus systems. Each SPA-4Si unit
in the kit provides voice activated (VOX) intercom and music input for
up to four headset positions in a small, permanent, panel mounted
installation in the aircraft.
STEREO MUSIC INPUT – Music input accepts standard portable music
headphone or line level outputs. May use one input for all SPA-4Si units
in the system or each SPA-4Si can have a independent music source.
Automobile Speaker level outputs can be adapted for use with SPA-
4Si intercoms.
COMPATIBILITY – Sigtronics SPA-4Si 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-4Si 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-4Si intercoms are constructed of high quality
components and carry a five year parts and labor warranty.
HARDWARE SUPPLIED
Besides the intercom and instructions, each SPA-4Si unit 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
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