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Aviation Intercoms
Sigtronics Aviation Intercom Technical Information. On this page you will find intercom instructions, parts lists, and installation information you may download. The files are in Adobe PDF format and can be opened by Adobe Reader. You will need Adobe Reader 5.0 or higher. Click on the Get Adobe Reader button below to download your free copy from Adobe.

For technical information on the use or installation of Sigtronics products not covered here, E-mail Technical Support: tech@sigtronics.com or call Monday through Friday 8:00 a.m. to 4:30 p.m. Pacific Time
909 305-9399

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INSTALLATION AND OPERATING INSTRUCTIONS
Listed Alphabetically by Model Number
RES
(Out of Production)
Installation and
Operating Instructions
Remote Stereo Music Switcher for Single Seat Aircraft or Non-Sigtronics Intercoms.
RES-2
Installation and
Operating Instructions
 Remote Stereo Music Switcher for Single Seat Aircraft or Non-Sigtronics Intercoms.
RES-400
(Out of Production)
Installation and
Operating Instructions
 Remote Stereo Music Switcher for SPA-400 Intercoms.
RES-401 / RES-601
Installation
Instructions
Operating
Instructions
 Remote Stereo Music Switcher for SPA-400/SPA-600 Intercoms.
RMS-440 / RMS-640
Installation
Instructions
Operating
Instructions
 Remote Stereo Music Switcher for SAS-440/SAS-640 Intercoms.
SAS-440 / SAS-640
Installation and
Operating Instructions
 Panel Mount Intercom with AutoSquelch and Pilot Isolate.
SCI-S4 / SCI-S6
Installation
Instructions
Operating
Instructions
 Panel Mount Intercom with Dual Stereo Music Inputs, Pilot Isolate, and Crew Isolate.
SCI-4 / SCI-6
Installation and
Operating Instructions
 Panel Mount Intercom with Dual Controls, Pilot Isolate, and Crew Isolate.
SCI-4 / SCI-6
For Microair 760 Radio		 Figure 4 installation drawing modification for Microair 760 radios.
SCI Panel Template Panel Templates for SCI, SPA, and Sport 200 intercoms.
SDB-800
Installation and
Operating Instructions
 Panel Mount Intercom System for Aircraft with Dual Audio Panels.
SPA-400
Installation and
Operating Instructions
 Panel Mount Intercom, Standard 4 Place.
SPA-400
For Apollo SL-40 Radio		 Figure 4 installation drawing modification for Apollo SL-40 radios.
SPA-400
For Com 120 Radio		 Figure 4 installation drawing modification for Com 120 radios.
SPA-400
For Garmin GNC250/XL Radio		 Figure 4 installation drawing modification for Garmin GNC250/XL radios.
SPA-400
For ICOM A-200 Radio		 Figure 4 installation drawing modification for ICOM A-200 radios.
SPA-400
For ICOM A20, A21 Radio		 Figure 4 installation drawing modification for ICOM A20, A21 radios.
SPA-400
For ICOM A3, A6 , A22, A24 Radios		 Figure 4 installation drawing modification for ICOM A3, A6, A22, A24 radios.
SPA-400
For King KA 134 Audio Panel		 Figure 4 installation drawing modification for King KA 134 Audio Panel.
SPA-400
For King KMA 20 Audio Panel		 Figure 4 installation drawing modification for King KMA 20 Audio Panel.
SPA-400
For King KY 97A Radio		 Figure 4 installation drawing modification for King KY 97A radios.
SPA-400
For Microair 760 Radio		 Figure 4 installation drawing modification for Microair 760 radios.
SPA-400
For Narco MK12D Radio		 Figure 4 installation drawing modification for Narco MK12D radios.
SPA-400
For U-174 / U Headset Jacks		 Figure 4 installation drawing modification for U-174 / U Headset Jacks.
SPA-400N
Installation and
Operating Instructions
 Panel Mount Intercom, 4 Place High Noise Version.
SPA-4S / SPA-4SN
Installation
Instructions
Operating
Instructions
 Panel Mount Intercom, Standard 4 Place, Stereo, and High Noise Version.
SPA-4S / SPA-4SN
(Out of Production) 		Panel Mount Intercom, Standard 4 Place, Stereo, and High Noise Version
Serial Numbers - 4603444 and lower
SPA-4S
For ICOM A3, A6 , A22, A24 Radios		 Figure 4 installation drawing modification for ICOM A3, A6, A22, A24 radios.
SPA-4S
For ICOM A-200 Radio		 Figure 4 installation drawing modification for ICOM A-200 radios.
SPA-4S
For Microair 760 Radio		 Figure 4 installation drawing modification for Microair 760 radios.
SPA-4SN
For Apollo SL-40 Radio		 Figure 4 installation drawing modification for Apollo SL-40 radios.
SPA-600
Installation and
Operating Instructions
 Panel Mount Intercom, Standard 6 Place.
SPA-600N Panel Mount Intercom, 6 Place High Noise Version.
SPA Panel Template Panel Templates for SCI, SPA, and Sport 200 intercoms.
SPCC-2
Installation and
Operating Instructions
 Portable Dual Audio Panel / Intercom, 2 Radio.
SPCC-3
Installation and
Operating Instructions
 Portable Dual Audio Panel / Intercom, 3 Radio.
SPE-2
(Out of Production)
Installation and
Operating Instructions
 Permanent Intercom, 2 Place.
SPE-4
(Out of Production)
Installation and
Operating Instructions
 Permanent Intercom, 4 Place.
SPO-20
(Out of Production)
Installation and
Operating Instructions
 Transcom Portable Intercom, 2 Place.
SPO-22 / -42 / -62
Installation and
Operating Instructions
 Transcom II Portable Battery Powered Intercom with Aux In and Out Jacks.
SPO-40
(Out of Production)
Installation and
Operating Instructions
 Transcom Portable Intercom, 4 Place.
Sport 200 Panel Mount Intercom, 2 Place, High Noise.
Sport 200
For Becker AR 3201 Radio		 Figure 4 installation drawing modification for Becker AR 3201 radios.
Sport 200
For Becker AR 4201 Radio		 Figure 4 installation drawing modification for Becker AR 4201 radios.
Sport 200
For Flightline FL-760 Radio		 Figure 4 installation drawing modification for Flightline FL-760 radios.
Sport 200
For ICOM A3, A6 , A22, A24 Radios		 Figure 4 installation drawing modification for ICOM A3, A6, A22, A24 radios.
Sport 200
For ICOM A4 Radio		 Figure 4 installation drawing modification for ICOM A4 radios.
Sport 200
For ICOM A20, A21 Radios		 Figure 4 installation drawing modification for ICOM A20, A21 radios.
Sport 200
For ICOM A23, A5 Radios		 Figure 4 installation drawing modification for ICOM A23, A5 radios.
Sport 200
For ICOM A-200 Radio		 Figure 4 installation drawing modification for ICOM A-200 radios.
Sport 200
For King KX 99 Radio		 Figure 4 installation drawing modification for King KX 99 radios.
Sport 200
For Microair 760 Radio		 Figure 4 installation drawing modification for Microair 760 radios.
Sport 200
For Sporty's SP-200 Radio		 Figure 4 installation drawing modification for Sporty's SP-200 radios.
Sport 200
For U-174 / U Headset Jacks		 Figure 4 installation drawing modification for U-174 / U Headset Jacks.
Sport 200
For Vertex Standard VXA-300 Radio		 Figure 4 installation drawing modification for Vertex Standard VXA-300 radios.
Sport 200
For XCOM VHF760 Radio		 Figure 4 installation drawing modification for XCOM VHF760 radio.
Sport 200 S Panel Mount Intercom, 2 Place, Stereo, High Noise.
Sport 200 S
(Out of Production)		 Panel Mount Intercom, 2 Place, Stereo, High Noise.
Serial Numbers - 481700 and lower
Sport 200 S
For Apollo SL-30, SL-40 Radios		 Installation and Operating
Instructions Figure 4 Mod		 Figure 4 installation drawing modification for Apollo SL-30, SL-40 radios.
Sport 200 S
For Becker AR 3201 Radio		 Figure 4 installation drawing modification for Becker AR 3201 radios.
Sport 200 S
For Becker AR 4201 Radio		 Figure 4 installation drawing modification for Becker AR 4201 radios.
Sport 200 S
For Filser Electronic ATR 600 Radio		 Figure 4 installation drawing modification for Filser Electronic ATR 600 radios.
Sport 200 S
For ICOM A3, A6 , A22, A24 Radios		 Figure 4 installation drawing modification for ICOM A3, A6, A22, A24 radios.
Sport 200 S
For ICOM A4 Radio		 Installation and Operating
Instructions Figure 4 Mod		 Figure 4 installation drawing modification for ICOM A4 radios.
Sport 200 S
For ICOM A23, A5 Radio		 Figure 4 installation drawing modification for ICOM A23, A5 radios.
Sport 200 S
For ICOM A-200 Radio		 Figure 4 installation drawing modification for ICOM A-200 radios.
Sport 200 S
For King KY 97A Radio		 Figure 4 installation drawing modification for King KY 97A radios.
Sport 200 S
For Microair 760 Radio		 Figure 4 installation drawing modification for Microair 760 radios.
Sport 200 S
For Sporty's SP-200 Radio		 Figure 4 installation drawing modification for Sporty's SP-200 radios.
Sport 200 S
For Vertex Standard VXA-300 Radio		 Figure 4 installation drawing modification for Vertex Standard VXA-300 radios.
Sport 200 S
For XCOM VHF760 Radio		 Figure 4 installation drawing modification for XCOM VHF760 radio.
Sport 200 Panel Template Panel Templates for SCI, SPA, and Sport 200 intercoms.
SRE-2
(Out of Production)
Installation and
Operating Instructions
 Remote Mounted Intercom, 2 Place.
SRE-4
(Out of Production)
Installation and
Operating Instructions
 Remote Mounted Intercom, 4 Place.
ST-400 / RES-400
(Out of Production)
Installation and
Operating Instructions
 Panel Mount Intercom, Standard 4 Place with Remote Stereo Music Switcher. (Manufactured Before 10/95)
ST-400 / ST-600
Installation
Instructions
Operating
Instructions
 Stereocom Panel Mount Intercom, Standard 4 and 6 Place with Remote Amplified Stereo Music Switcher.
ST-440 / ST-640
Installation
Instructions
Operating
Instructions
 Panel Mount Intercom with AutoSquelch, Pilot Isolate, and Remote Stereo Music Switcher, 4 and 6 Place.
MODIFICATION INSTRUCTIONS
Listed by Model Number
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SDB-800 Sidetone Modification Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1528, (SDB-800 S/N 1151486 A & B to Current)
SDB-800 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1440, (SDB-800 S/N 1151004 A & B to 1151485 A & B)
Dual SPA-400 / 600 Installation It allows pilot and co-pilot to transmit and receive on the aircraft radio and intercom between themselves, while back passengers can have a separate conversation without interrupting the front two.
Dual ST-400 / 600 Installation It allows pilot and co-pilot to transmit and receive on the aircraft radio, listen to music, and intercom between themselves, while back passengers can have a separate conversation and music without interrupting the front two.
SPA-600 to SCI-6 Upgrade Overview Upgrading overview
Sport-200 Sidetone Modification Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1528, (Sport 200 S/N 6202993 to Current)
Sport-200 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1440, (Sport 200 S/N 6202355 to 6202992)
SPA-400 / 600 Sidetone Modification Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1528, (SPA-400 S/N 6069006 to Current & SPA-600 S/N 1102528 to Current)
SPA-400 / 600 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1440, (SPA-400 S/N 6053486 to 6069005 & SPA-600 S/N 1101839 to 1102527)
SPA-400 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1092-4, SPA-400 Panel Mount, S/N 61960 to 6053485
SPA-400 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1092-3, SPA-400 Panel Mount, S/N 60975 to 61959
SPA-400 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1092-2, SPA-400 Panel Mount, S/N 60500 to 60974
SPA-400 Sidetone Modification
(Out of Production)		 Panel Mount Intercom Transmit Sidetone Modification Circuit Board 1092, SPA-400 Panel Mount, S/N 60001 to 60499.
Sport-200 ICS Load Modification This modification is used when a Sigtronics Sport-200 Intercom is connected to a radio or audio panel that has a low impedance headphone output (less than 100 ohms).
SPA-400 / 600 ICS Load Modification This modification is used when a Sigtronics SPA Intercom is connected to a radio or audio panel that has a low impedance headphone output (less than 100 ohms).
SPA-400 / 600 and Portable Push-To-Talk Switches Installation Instructions for use on Sigtronics Panel Mount Intercom Systems
SPA-400 / 600 External Mic Interrupt Modification This modification applies to a Sigtronics SPA-400/600 or ST-400 / ST-600 installations.
SPA-400 / 600 Pilot Isolate Option Add pilot isolate to a SPA-400 / SPA-600 Intercom.
SPA-400, SPA-400N, SPA-600, and SPA-600N Music Input Music input options for Sigtronics SPA panel mount intercoms.
RES-400 / RES-600 Modifications
(Out of Production)		 Music Switcher low power music source modification; Monaural wiring instructions; Notes on music sources with floating speaker outputs.
Older ST-400 / ST-600 Units and Four Wire Speaker Output Music Systems
(Out of Production)		 Older ST-400 / ST-600 with the RES-400 or RES-600 stereo music switchers manufactured before 10/95. (Applicable serial numbers - RES-400, 1002922 and lower. RES-600, 1050604 and lower).
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