CIRCUIT DESIGN WA-RX-03S, Руководство по эксплуатации

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OG_WA-03S_V10e Circuit Design, Inc. 6
OPERATION GUIDE
WA-RX-03S receiver module
CN1
No. Name I/O Description Equivalent circuit
1 CON I
Terminal for adjustment of mute level.
Connect a 10 to 20 kΩ VR to the terminal for
mute level adjustment.
The mute level is the threshold level of the
received signal field strength so as not to
output the received signal below the threshold
level.
2 LED O
MUTE LED terminal
The terminal is high when mute is in operation.
It is low when the AF signal is output, so that
the LED connecting the terminal works as an
AF output indicator showing the AF output
status.
The terminal is an open collector and is
connected to a 220Ω resistor (Max 10mA).
3 UNA O
LED terminal for unavailable channels.
The terminal is high when any channel other
than CH 1 to 15 is selected.
The LED can be powered directly
4 VCC I
Power supply (+) terminal
The voltage range is DC 3.0 to 5 V
A power source without ripple noise should be
used.
Be sure to connect it with the correct polarity.
To maintain a lower voltage, a protection diode
is not provided in the circuit.
5 AF O
Audio output terminal
Output impedance is 20 kΩ.
Connection to a low input impedance interface
will decrease the output level.
Maximum output level is –10 dBv
When an audio amplifier is used, if the
amplified output is distorted by the MIC input,
insert an attenuator.
6 GND I
GND terminal
The ground is for the power supply and
antenna radial.
Connect it to a wide ground plane for stable
operation.
7 ANT I
Antenna terminal (RF input).
50 Ω impedance