ATR833-LCD / P/N 833-(3xx)-(3xx)
Operation and Installation
32
Document-No.: 01.1404.010.71e / Revision: 1.01
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 Input
Left
Right
Standard (headset)
MLS
MRS
Dynamic (glider’s gooseneck
microphone)
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 3.6).
The inputs for dynamic microphones are appropriate for input voltages of
5 mVpp to 10 mVpp. These inputs have no bias.
In general standard microphones (headsets) MLS/MRS and dynamic
microphones (hand/gooseneck) MLD/MRD 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 3.6).
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.
