F.u.n.k.e. ATR833-II, Эксплуатация и установка

Страница: 44 / 56

ATR833-II / P/N 833-II (Cxxx)-(Cxxx)
Operation and Installation
43 Doc.-No. 01.143.010.71e / Revision 1.01
4.9 Microphone / Intercom settings
The settings of MIC and VOX values are essential for Intercom. The
respective configuration options are described in chapter 2.5.3
(VOX=threshold level) and chapter 3.6 (MIC input sensitivity).
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.
4.10 Post-Installation Check
When installation is completed all steering and control functions of the
aircraft are to be examined, in order to exclude disturbances by the
wiring.
The SWR shall not exceed 3:1.
Furthermore a test flight is recommended, in order to guarantee the
proper in-flight operation of the radio:
•
In a flight altitude of at least 2000 ft contact a ground station in a
distance of at least 50 km (30 nautical miles).
•
Pay attention to unusual electrical interference.
•
If possible, perform the radio test on frequencies within the upper
and lower VHF communication frequency range
A certified maintenance shop must verify proper operation of
the VHF Transceiver System.