OG_WA-03S_V10e
Circuit Design, Inc.
5
OPERATION GUIDE
TERMINAL DESCRIPTION
WA-TX-03S transmitter module
No. Name
I/O
Description
Equivalent circuit
1
UNA
O
LED terminal for unavailable channels.
The terminal is high when any channel
outside CH 1 to 15 is selected.
LED can be powered directly
2
SW0
I
Transmitter channel setting terminal
Select channel within 15 programmed
channels
Refer to “Channel table”
SW0
to
SW3
are
disabled
when
STB=H(open).
3
SW1
I
4
SW2
I
5
SW3
I
6
NC
-
7
SW5
I
H(open): 5mW
L(GND): 10mW
Power setting is enabled when the module
newly starts transmitting.
SW5 is disabled when STB=H(open).
8
STB
I
Terminal for stand-by with power off delay
Set to High(open) to enter standby.
Set to ground when transmitting.
9
AF
I
Audio signal input terminal
Audio input signal level -113 dBv to -13 dBv
10
VCC
I
Power supply (+) terminal
Voltage range is DC 4.2 to 6 V
A power source without ripple noise should
be used.
A protection diode for reverse connection is
provided in the circuit.
11
ANT
O
Antenna terminal (RF output)
50 Ω impedance
12
GND
I
GND terminal
The ground is for the power supply and
antenna radial.
Connect it to a wide ground plane for efficient
antenna emissions and stable operation.
-
+
12kΩ
10uF
Terminal
3V
*
SW0-3&SW5: 3V when STB=L(GND)
*
STB: always 3V
*
*
