ATR833 / P/N 833-(1xx)-(1xx)
Operation and Installation
3.6 Equipment Connections
One 25 pin D-SUB miniature connector includes all electrical
connections, except for the antenna
The (+UB)-wire has to protected by circuit breaker (4 Amp.
slow-blow)!
3.6.1 Microphone-Connection
Microphone
Left
Right
standard
Ls.MIC Rs.MIC
dynamics
Ld.MIC Rd.MIC
The inputs for standard microphones are appropriate for input voltages of
50 mVpp to 2 Vpp. These inputs have a bias voltage of 8 V at 330 ohms.
Sensitivity is adjustable in the init menu with MIC. (see 2.8.4).
The inputs for dynamic microphones are appropriate for input voltages of
5 mVpp to 10 mVpp. These inputs have no bias.
In general standard and dynamic microphones (headsets) can be used
simultaneously.
In motor gliders, when the engine is running, the dynamic microphones
should be turned off (switch Ld/Rd inputs to GND), in order to avoid the
transmission of the engine’s noise.
If no dynamic microphone is installed, the input sensitivity MIC for Ld/Rd
shall be set to 1 (MIC01…see 2.8.4 MIC – Settings page 22). Therewith
these microphone inputs are set to “insensitive“.
Per microphone input two microphones may be connected in parallel.
3.6.2 Headset-Connection
Headphones may be connected parallel as long as the total impedance
doesn’t fall below 8 Ohm.
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Dokument-Nr.: 01.1402.010.71e / Revision: 1.01