Becker BD406 - Headphone Connection; Panel Illumination; Pwr_Eval; Msg

Becker Avionics
Installation and Operation
Electrical Interface
DV16401.03 Issue 04 May 2021 BD406/PBD406 53
Headphone Connection
Pin
Type
I/O
Name
Function
Remarks
1
Analog
O
HDPH-
Headphone output return
signal (balanced)
P1 connector
2
Analog
O
HDPH+
Headphone output signal
(balanced)
P1 connector
The headphone output is a balanced, transformer-coupled output has nominal 300 mW into 150 Ω.
It is highly recommended to install the jacks isolated from aircraft frame to prevent ground loops.
Panel Illumination
Pin
Type
I/O
Name
Function
Remarks
8
Analog
I
ILLUM-
Adjustment of display
backlight.
P1 connector
9
Analog
I
ILLUM+
Adjustment of display
backlight.
P1 connector
The BD406 has illuminated push buttons and an LCD. The illumination can be configured for front
panel or external control (P1, pins 8, 9).
Connect ILLUM- (pin 8) to system ground.
Connect ILLUM+ (pin 9) to a dimming voltage bus.
/PWR_EVAL
Pin
Type
I/O
Name
Function
Remarks
4
Discrete
O
/PWR_EVAL
Device power on/off indicator.
P1 connector
This output shows if the transceiver is on or off.
It is an open collector output type. Maximal load current is 20 mA.
When the device is operational, the pin is active – it has low impedance to GND.
When the device is off, the output has high impedance to GND.
If not used, keep pin(s) unconnected.
/MSG
Pin
Type
I/O
Name
Function
Remarks
17
Discrete
O
/MSG
Signal of reception of valid
message.
P1 connector
This output shows if a valid COSPAS/SARSAT signal is received by the receiver.
It is an open collector output type. Maximal load current is 20 mA.
When beacon message is received – the output has low impedance to GND (is active) for 400 ms.
In inactive state the output has high impedance to GND.
The output has high impedance when the device is off.
If not used, keep pin(s) unconnected.
/GPO_0
Pin
Type
I/O
Name
Function
Remarks
5
Discrete
O
/GPO_0
Configurable general purpose
output.
P1 connector
This output indicates if a valid COSPAS/SARSAT signal that is not recorded in the beacon database is
received by the receiver.
It is an open collector output type. Maximal load current is 20 mA.
When beacon message is received – the output has low impedance to GND (is active) for 400 ms.
In inactive state the output has high impedance to GND.
The output has high impedance when the device is off.
If not used, keep pin(s) unconnected.