Becker AR620X - Page 48

Installation
Electrical Interface
48 Transceiver Family 620X DV14307.03 Issue 04 March 2016
The magnetic field of a speaker influences the magnetic compass. When
choosing the mounting point, a safe distance between the compass and
the speaker must be determined. After speaker installation, verify the
accuracy of the magnetic compass.
Headphone(s) Connection
Pin No.
Pin Name
Direction
Function
P1-2
HDPH1_A
OUT
Balanced output for headphone(s) 1
P1-3
HDPH1_B
OUT
Balanced output for headphone(s) 1
P1-20
HDPH2_A
OUT
Balanced output for headphone(s) 2
P1-22
HDPH2_B
OUT
Balanced output for headphone(s) 2
The headphone 1 output is a balanced, transformer-coupled output providing nominal 300 mW into
75 Ω. Using a shielded single wire for headphones requires an unbalanced output configuration. To
achieve this, ground P1-3 (connect pin P1-13 with P1-25).
The headphone 2 output is a balanced output providing nominal 200 mW into 75 Ω.
Up to two headphones with phone-impedance of 300 Ω (or higher) may be connected in parallel on
each circuit, therefore up to four headphones can be connected at the same time.
Note: It is highly recommended to mount the jacks isolated from aircraft frame in
order to avoid ground loops.
CAUTION: The headphone 2 output shall be always floating (cannot be connected in
unbalance configuration as headphone 1).
Panel Illumination
Pin No.
Pin Name
Direction
Function
P1-10
ILL_LO
IN
Illumination low input
P1-23
ILL_HI
IN
Illumination high input
The VHF transceiver provides illumination for pushbuttons and LCD display. Configuration of panel
illumination provides the configuration setup accessible via front panel. Depending on setup selection,
14 or 28 V fixed illumination voltage, or aircraft dim-bus voltage is in operation.
Connect ILL_LO (pin P1-10) to aircraft ground. Connect ILL_HI (pin P1-23) to dimming bus.
"Auxiliary" Audio Input
Pin No.
Pin Name
Direction
Function
P1-4
AF_AUX_IN_HI
IN
Auxiliary audio input hot
P1-21
AF_AUX_IN_LO
-
Auxiliary audio input low return
The AF auxiliary input enables to connect an external audio source (NAV, music-player, etc.) to the
transceiver. The external audio is audible only
when transceiver is in receiving mode.
Input sensitivity is adjustable in the configuration setup from 50 mV...8 V. The impedance of this input
is 600 Ω.
"LINE_OUT" Audio Output
Pin No.
Pin Name
Direction
Function
P1-14
SPK_LO
-
Speaker ground (return)
P1-15
LINE_OUT_HI
OUT
Linear audio output, unbalanced
The LINE OUT enables to connect e.g. an external voice recorder to the transceiver when used in
ground-based installations. The LINE OUT output provides nominal 1 V
RMS
into 1000 Ω.