Flight Test Check; Trouble Shooting - Becker AR6201 Installation And Operation Manual

Check the intercom function just by talking into the microphone, while
the engine is running at cruising rpm. You should hear yourself and/or
your co-pilot loud and clear.
Switch "ON" the squelch and check that the normal radio noise, without a
present carrier signal, is constant suppressed. The threshold of the
squelch can be set in the Pilots Menu.

2.11.6 Flight Test Check

It is highly recommended to perform flight test as final installation
verification. The performance of the AR6201-(X0X) may be verified by
contacting a ground station at a range of at least 50 nm while
maintaining an appropriate altitude and over all normal flight
attitudes. Check the performance in the low, mid and high band
frequencies.

2.12 Trouble Shooting

Problem
Intercom function is not
working.
You cannot hear yourself
by talking into the
microphone.
Continued from previous
page
The VOX threshold can-not
be adjusted at all. VOX
is always "OFF".
A high cabin noise is too
high during intercom /
transmission operation.
Page 2-40
AR6201-(X0X)
Possible Reason
VOX not activated, or the
threshold adjustment is
set too high.
Intercom volume turned
"OFF", or adjusted to a
very low signal level.
Probably the microphone
input sensitivity level
adjustment is
insufficient and adjusted
to a too high value.
VOX function might be
deselected because the
speaker is "ON".
The sensitivity of the
microphone input is too
sensitive.
Proposed Solution
Adjust the VOX trigger
level to a lower value.
A value of "-15" is
suitable in most cases.
Refer to chapter 3.13.1.
Adjust the intercom
volume to a higher
value. A value "37"
result in an intercom
signal level well
readable.
Refer to chapter 3.13.1.
Adjust the sensitivity
of the microphone input
to a lower value. For
standard mike a setting
of 50 ... 120 mV is
typically sufficient for
most of the avionic
headsets.
Refer to chapter 2.8.5.
Switch speaker "OFF".
Refer to chapter 2.8.5.
Adjust the microphone
sensitivity to a higher
value and this makes the
cabin noise relatively
decreased.
Recheck transmission
operation and/or
Intercom function.
DV 14300.03/.04 Issue 5 5/2013