4-Place Panel Mount Intercom Kit
RST-443, $143
The model RST 443 inter-communications system is a build it yourself piece of avionics equipment designed to give many hours of reliable use. The RST-443 intercom is intended as a permanently mounted four-station intercom in the aircraft.
The intercom is easy to assemble; all components are mounted to either a small printed circuit board or the chassis of the intercom. It is a fully complete voice activated system that allows pilot passenger or student instructor conversation to take place with a minimum of interference from engine noise, wind noise and other outside distractions.
The intercoms may also be wired into the aircraft radio circuitry so that the aircraft radio may be used for both receive and transmit simultaneous with intercommunications. Depending on the desires of the instructor or pilot, the intercom may be wired for pilot only or pilot AND copilot reception/transmission on the aircraft radio while cutting out passenger chatter in the "pilot" mode. This feature allows either or both the pilot and copilot to serve as the communicator. Some uses of this feature would be copilot handling radio duties during cross country flights, student radio operation with instructor override, and student monitoring an instructor's transmissions. Pilot, copilot, and all passengers can hear both sides of all transmissions in the "all" mode.
You may wish to download drawing 443-4070.pdf to see one recommended method of electrical installation of the 443 intercom in a typical light aircraft environment.
There are no input/output jacks on the intercom. All headsets plug into their respective jacks permanently mounted in the aircraft. If the aircraft has no current headphone-microphone jacks, you may wish to see the "small parts" section of this website and order a sufficient quantity of these jacks for your aircraft.
Several convenience features have been designed into the kit. Any standard CIVILIAN (*) aircraft (carbon, “dynamic” or “electret”) boom mike headset may be used with the intercom, power supplies from 11 to 14.5 volts DC (12-14 volt system), music inputs from both right and left channels of a stereo music source summed to a monophonic output into the aircraft headphones. The music input circuit is deactivated if there is a signal present on the radio or any headset microphone. In addition, the intercom has an adjustable master volume control and a front panel squelch control to eliminate annoying background noise.
Specifications
- Inputs
- Microphone: Standard CIVILIAN (*) aircraft microphones (up to 4).
- Radio and music: High level inputs from speaker or headphone circuits.
- Output
- Phones: 0 - 8 volts P P across 4 standard 150 ohm headsets (40 mW).
Pinout
2-Place Portable Intercom Kit
RST-442, $96
The RST-442 comes standard with all these features:
- Voice activated
- Pilot-All switch
- High power output
- Music input with priority squelch
- Powered by 9 volt battery, 12 volt or 24 volt aircraft system
- Construction and operation manual (includes RST-455 instructions).
Dimensions: 4"w x 2"h x 1.5"d 0.25 lb. Build time 8 hours avg.
4-Place Portable Intercom Kit
RST-445, $121
The 2-channel RST-442 intercom contains all the electronics necessary for a 4-channel intercom. The RST-445 is simply the standard 442 intercom plus an added extension box with microphone and headphone jacks for the other two passengers, plus the cables and connectors necessary for interconnecting the two chassis boxes. The only changes in the specifications are that it contains TWO boxes 4" x 2" x 1.5" and the build time increases by one hour.
Construction and operation manual included.
2 to 4 Place Portable Intercom Upgrade Kit
RST-455, $36
Any 2-channel RST-442 intercom may be expanded to a 4-channel RST-445 intercom with our intercom conversion kit. The conversion kit consists of an added chassis box with microphone and earphone connectors plus connectors and cable to run the added chassis box from the main intercom electronics. Manual not included.
Push-To-Talk Switch
RST-4160, $17
The standard portable push-to-talk switch that mounts on your yoke or control wheel with Velcro straps. This switch is compatible with our headsets, our intercoms, and our audio panel.
Fully assembled, not a kit.