ATR833A / P/N 833A-(1xx)-(1xx)
Operation and Installation
31
Dokument-Nr.: 01.1411.010.71e / Revision: 2.00
4.6 Equipment
Connections
One 25 pin D-SUB miniature connector includes all electrical
connections, except for the antenna.
4.6.1 Microphone-Connection
Microphone
Left
Right
standard
MLS MRS
dynamics
MLD MRD
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 configuration menu (see 3.5).
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 MLD/MRD inputs to GND), in order to avoid
the transmission of the engine’s noise.
If no dynamic microphone is installed, the input sensitivity for MLD/MRD
shall be set to 1 (see 3.5)
Per input, up to two microphones can be connected in parallel.
4.6.2 Headset-Connection
Headphones may be connected parallel as long as the total impedance
doesn’t fall below 8 Ohm.
The (+UB)-wire has to protected by circuit breaker (4 Amp.
slow-blow)!
Unused microphone inputs should be short-circuited.
