The CRI-1 is specifically designed to allow the integration of a wide range of commercial radio equipment into an aircraft audio system. The CRI-1 provides microphone bias, relay keying and sidetone generation. It also provides adjustable microphone and audio outputs that are isolated from airframe ground. A wide range of radio microphone inputs can be accommodated through the appropriate selection of a resistor impedance network.

The CRI-1 is CASA APMA and STC approved for installation into the Eurocopter AS 355F1 Series. For limitations and conditions please refer to STC ASA096SY.

Features

• All microphone and audio inputs and outputs are transformer isolated to minimise earth loop induced noise and have a 2kV breakdown voltage
• May be operated in either a 14VDC or 28VDC electrical system
• Dual keying relay contacts, (NO-NC-C), provide radio keying, microphone switching etc.
• Pins are allocated on the mating connector for external matching/attenuator network for specific microphone impedance matching requirements
• Pins allocated to add an external speaker load resistor
• Accommodates a wide range of radio input levels and impedances
• 600 and 150ohm outputs up to 0dbm are provided
• Designed to meet ARINC audio output (3 standard aircraft headsets direct)

 

Specifications

Environmental

Temperature: -40 to +50 Degrees C (operating)

Altitude: 15,000 ft max.

Humidity: 95% non-condensing

Physical                                                                                                

Height:          30 mm (1.18 inches)                                                 

Depth:           71 mm (2.79 inches)                                                 

Width:           115 mm (4.53 inches)                                               

Weight:         230 g (0.5 lb) Mounting:

Bulkhead attachment

Electrical Specifications                                                          

Voltage:     +14VDC or +28VDC (pin selectable)

Current:      60mAmps Max

Interface Specifications

Audio Output:                        

Level:                3 volts RMS into 50 Ohm

Impedance:   >50 Ohm

Microphone Output:        

Level:              +8 dbm (adjustable)

Impedance:   600 Ohm and 150 Ohm  (Note: other impedances can be achieved using external resistor networks – Refer to installation section)

Frequency Range: 300 Hz to 6 kHz