Lectrosonics DBa Instruction Manual page 5

DBa Block Diagram
+5V
Servo Bias
Supply
Input
Jack
Input
Preamp
Gain
Adj
Shunt
Limiter Control
Limiter
PLL Ref
Oscillator
VCTXO
36.864 mHz
Rio Rancho, NM
DBu Transmitter
Bias Voltage
0, 2 or 4V
A-D
Converter
HI/Lo
Audio
Pass
Filter
I2S
Microprocessor
Key Received
Blue LED
Phase Locked Loop
Digital Hybrid Wireless Belt-Pack Transmitter
D-A Convert-
er I + Q
Baseband
Signals
I2S
(2) AA
Batteries
Firmware
Update
UART
Security Key
Keypad
Voltage Controlled
Oscillator
Control
Low
pass
filters
Switching
Power
Supply
Power
LED
Tricolor
USB
Jack
IQ Modulator
Low
Buffer
Pass
Filter
Filters
Final
Amplifier
5