SR-FRS-2WVS 136M-174MHz is a low cost but high performance integrated walkit talkie module. With built-in high performance micro controller, narrow band rf transceiver and standard Uart interface,it can be easily used and succeed in all the walkie talkie function with good quality voice and long distance transmission. Users only need to connect external audio amplifiers, microphone or speaker with this module ,then it can work as a small walkie talkie with 2W output . In open area, it can come to performance of 9Km communication. Simplified interface and ultra small size make this module into a wide range of applications, also can conveniently embed into various handheld devices,to improve the comprehensive performance of end products.
Besides the excellent voice intercom, The more important feature is this module has the data/SMS transfer ability; up to 70 byte can be sent at one time; it is compliance with the standard UART transfer protocol;
Features
FM demodulation technique Based on digital signal processing technology；
Frequency Range：VHF136M-174MHz；
Frequency step：5K/6.25K/12.5K/25K；
RF Output Power： 2W/1W/0.5W
Receive sensivitity： -122dbm
voice encryption (scrambling): 8 type.
Voice Compression- Expansion ；
SMS Receive /Transformer，The space Baut : 1200；
CTCSS（38 group）+ CDCSS（83 group） ；
Automatic elimination tail ；
Volume adjustable（1-8）；
Vox level adjustable（0-8）；
SQ level adjustable（0-9）；
MIC sensitivity level adjustable（1-8）
The ultra low power dissipation in Sleep Mode（0.1uA）;
Power supply ：DC 3.3～5.0V
Ultra small size：17*28.5*3.0mm
Communication distance：more than 9 KM in open area .
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 description
|
Pin number
|
pin name
|
IO
|
Function description
|
|
1
|
SDA
|
|
Program only, user unused
|
|
2
|
CLK
|
|
Program only, user unused
|
|
3
|
I/O
|
|
Program only, user unsed.
|
|
4
|
AF_OUT
|
OUT
|
Audio output
|
|
5
|
MIC
|
IN
|
Micphone input
|
|
6
|
HML
|
IN
|
Transmit power selection:
GND: 0.5w
NC: 2W
1.5V: 1W (unuseful)
|
|
7
|
ANT
|
IN/OUT
|
Antenna
|
|
8
|
GND
|
GND
|
GND
|
|
9
|
MIC_IN
|
IN
|
Microphone input;
|
|
10
|
B+
|
OUT
|
Module power supply
|
|
11
|
VOX
|
OUT
|
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
|
|
12
|
RXD
|
IN
|
UART_RXD
|
|
13
|
PTT
|
IN
|
PTT control
1：Receive；
0：Transmit
|
|
14
|
SQ
|
OUT
|
Squelch control
0: active
|
|
15
|
TXD
|
OUT
|
UART_TXD
|
|
16
|
PD
|
IN/OUT
|
Module power control:
1: Power on
0: Power off
|
|
17
|
VCC
|
|
+3V output
|
|
18
|
GND
|
GND
|
|
Typical application Block diagram
