ATR833A / P/N 833A-(xxx)-(1xx)
Operation and Installation
38
Dokument-Nr.: 01.1411.010.71e / Revision: 3.00
•
Assemble the antenna in vertical position so on or under the belly that
it is as far distant as possible from all protruding parts (propeller,
chassis, vertical stabilizer)
•
For glider installation the internal antenna installed by the
manufacturer should be used.
•
The SWR shall not exceed 3:1.
4.9 Microphone / Intercom settings
The settings of MIC and VOX values are essential for Intercom. The
respective configuration options are described in sections 3.5
(MIC=Microphone level) and 2.4.4 (VOX=threshold level)
If the VOX automatism is deactivated with VOX=01 intercom is activated
using the intercom switch (not PTT), which connects PIN 7 (intercom) of
the equipment connector to GND.
For operation with VOX activated PIN 7 has to be connected to GND
permanently.
Transmission merely operates when PTT is pressed.
The suppression of background noise is only possible using differential
microphones, as they are usual with modern headsets. Normal electret
microphones are not suitable.
The HF antenna wire must not be included in any other
cable sets, for example power supply or microphone. It
must also not be placed together with other antenna
wires, for example NAV or Transponder.
