Filser Electronic ATR 57 COM, Инструкция по установке и эксплуатации

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Filser Electronic GmbH
Gewerbestraße 2
86875 Waal
Page 7
2.5 Microphone connection
The ATR57 has two microphone inputs :Mic 1 and Mic 2.
Ø
Mic 1 input for Electret microphone or dynamic microphone with
preamplifier (50 mV to 2Vpp) adjustable with the Mic Level
control. This input provides a bias voltage of 9V at 330 Ohm.
For dynamic microphone a switch (Mic Setting) located at the top
side of the unit (see diagram below) is used to select the input
level for 5mV to 10mV without the bias .
Factory setting is Electret.
Ø
Mic 2 input is for Electret microphone only (50 mV to 2Vpp)
adjustable with the Mic Level control.
The Mic Level control is located at the top of the unit.
If two Electret microphone are used they must have equal output levels for
proper intercom operation, also the Mic Level controls for Mic 1 and 2 are
simultaneous.
Factory setting is to standard Electret (ECM) microphone (50mV to 2V).
2.5.1 Microphone level check
Ø
To get a reference for a correct MIC-level make sure that the VOX-
value is at 16. With a headset the level can be checked, by speaking
at the normal distance to the Mic and increasing the Mic Level until
the VOX turns on and off at a satisfying level.
Diagram for Mic Level and Mic Switch
After installation in the aircraft is completed, a radio check should
be made and if necessary the Mic Level must be readjusted.
45°
Mic. Level