SR110U is a wireless voice transceiver and data transmission module with an extremely high cost-performance ratio. It is built-in with a high-performance radio frequency transceiver chip, microcontroller, and radio frequency power amplifier. The external controller can set the working parameters of the module and control the entire module's transmission and reception through the standard asynchronous serial interface (RS232) communication. The module only needs an external antenna, MIC, and voice power amplifier to form a complete two-way radio or data transceiver.
Features:
• FM modulation and demodulation technology based on digital signal processing;
• Frequency range:400MHz-480MHz;
• Selectable frequency steps: 5K/6.25K/12.5K/25K;
• RF output power: High power 1W, Low power 0.5W
• Voice encryption (scrambling) function: (8 modes optional)
• SMS receiving and sending function: Air rate 1200bps;
• Serial communication: 9600bps;
• Built-in CTCSS (38 groups), CDCSS (83 groups) encoding and decoding, support positive and negative phases
• DTMF encode and decode function (contact us for customization if needed)
• RSSI receives signal strength reading function
• Auto tail cut-off function;
• Busy channel lockout function (BCLO);
• Adjustable digital volume (1-9 levels);
• Adjustable hands-free talk function with voice control (0-8 levels);
• Adjustable noise suppression level (0-9 levels);
• MIC sensitivity software adjustable (1-8 levels)
• High receiving sensitivity:-122dBm;
• Ultra low power hibernation mode (0.1uA);
• Voltage working range:3.3～5.0V, recommended working voltage range 3.5V-4.2V
• Tiny size:18*35*3.2MM;
Applications：
- Portable intercom and paging systems
- Wireless data transmission
- Mobile phones and other embedded in-radio functions product
- Portable walkie-talkie
- Outdoor sports equipment
- Building security
- Audio monitor system
Module pin assignment
|
J1 pin name
|
PIN
|
Function description
|
|
SQ
|
1
|
Squelch control
0: Active
|
|
VOX_DET
|
2
|
1） with VOX mode， it is the VOX state indication；
0： Talk finished；
1： Talking；
2） without VOX， it is the transmitter state indication；
0： receive state
1： transmitter state
|
|
AF_OUT
|
3
|
Audio output
|
|
MIC1(NC)
|
4
|
NC
|
|
PTT
|
5
|
PTT control
1：Receive；
0：Transmit
|
|
PD
|
6
|
Sleep control，
0： into the sleep state
1： Running
|
|
H/L
|
7
|
RF transmit power selection；
0： 0.5W;
NC： 1W;
Note: if you want 1w power, just leave this pin NC, it can’t be pulled high.
|
|
BAT
|
8
|
Power supply: DC 3.3V - 5V
|
|
GND
|
9
|
GND
|
|
GND
|
10
|
GND
|
|
NC
|
11
|
NC
|
|
ANT
|
12
|
Rf Antenna input;
|
|
NC
|
13
|
NC
|
|
NC
|
14
|
NC
|
|
NC
|
15
|
NC
|
|
RXD
|
16
|
UART - Rxd
|
|
TXD
|
17
|
UART - Txd
|
|
MIC_IN
|
18
|
Microphone input;
|
Typical application Block diagram
See the pictures.
Useful Link:
AT Command for UHF/VHF Walkie Talkie radio module
