The Intercom That Set The Standard Sigtronics pioneered the voice activated intercom market in 1974 and continues to deliver value and performance today in the 4 or 6 place FAA TSO approved SPA-400 / 600 intercom series. With fail safe features that allow pilots to always hear the radio even if the intercom is off, and radio priority that assures ATC only hears the crew member transmitting, the SPA intercom series is the standard by which all others are judged. Individual Mic Bias Allows Compact Size High Noise Environment N Series |
Technical Information in PDF | ||||
Installation and Operating Instructions | Installation and Operating | |||
Installation and Operating | ||||
Installation and Operating | ||||
Installation and Operating | ||||
Panel Template | ||||
Installation | ||||
Operating | ||||
Radio Specific Installation Instructions Figure 4 installation drawing modification for specified radios. | SPA-400 For Apollo SL-40 Radio | SPA-400 For Com 120 Radio | SPA-400 For Garmin GNC250/XL Radio | SPA-400 For ICOM A-200 Radio |
SPA-400 For ICOM A20, A21 Radio | SPA-400 For ICOM A3, A6 , A22, A24 Radios | SPA-400 For King KA 134 Audio Panel | SPA-400 For King KMA 20 Audio Panel | |
SPA-400 For King KY 97A Radio | SPA-400 For Microair 760 Radio | SPA-400 For Narco MK12D Radio | SPA-400 For U-174 / U Headset Jacks | |
Modification | 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. | |||
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. | |||
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). | ||||
Installation Instructions for use on Sigtronics Panel Mount Intercom Systems | ||||
This modification applies to a Sigtronics SPA-400/600 or ST-400 / ST-600 installations. | ||||
Add pilot isolate to a SPA-400 / SPA-600 Intercom. | ||||
Music input options for Sigtronics SPA panel mount intercoms. | ||||
Trouble-shooting | Instructions designed to assist avionics technicians in diagnosing comm’ radio transmit problems following intercom installation. | |||
Helpful Hints | Communicating in Unusually High Noise Environments |
Probably one of the best intercoms available. We installed one in an aircraft that was riddled with radio transmission complaints, and it fixed all issues between all headset varieties as well as transmission problems. Very good intercom
Sigtronics Spa-400 Intercom
My original unit was fried by an electrical problem. Direct swap out fixed the issue. This unit works great, especially for the price.
Sigtronics Spa-400 Intercom
Replaced a previous model just like it it worked as expected
Sigtronics Spa-400 Intercom
Captain’s side kept cutting out last year and this year the co-pilot’s side kept cutting out. With the new Sigtronics intercom controller the issue was significantly reduced but on occasion the co-pilot’s side still cuts out. However there was significant improvement
Sigtronics Spa-400 Intercom
Perfect and the price is right
Sigtronics Spa-400 Intercom
Works great
Sigtronics Spa-400 Intercom
I am pleased with the product and look forward to many hours of clear clean communications in the cockpit.
Great customer support. A 5min call with Dino, to troubleshoot what turned out to be a small issue, saved ton of time and money. Thanks!
works good but took 15 hours to install with jacks and all kit
Sigtronics Spa-400 Intercom
Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
Yes, jack kit and pre-wired harness are included with the installation hardware.
Yes, this intercom is FAA TSO approved for use in certified aircraft.
No the intercom will not allow this.
The intercom does not have specific requirements for audio being fed through. As long as it is wired correctly, you will not have any issues.
Yes, as long as it is wired correctly, it will work.
Yes, that is correct.
The harness will be plug and play, it's the same