The SR-FRS-0W5 (VHF: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 0.5W output . In open area, it can come to performance of 3Km 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 60 byte can be sent at one time; it is compliance with the standard UART transfer protocol;
The key feature is its ultra small size: 15*25*3.0MM, it is easy to be embed into other
system such as mobile phone, MP3,MP4,etc
Features
FM demodulation technique Based on digital signal processing technology；
Frequency Range：VHF:136M-174MHZ
Frequency step：5K/6.25K/12.5K/25K；
Receive sensivitity： -122dbm
RF Output Power： 0.5W
voice encryption (scrambling): 8 type.
Voice Compression- Expansion ；
SMS Receive /Transformer，The wireless Baut : 1200；
CTCSS（38 group）+ CDCSS（83 group） ；
Automatic elimination tail ；
Volume adjustable（1-9）；
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：15*25*3.0 MM；
Communication distance：more than 3 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 mechanical size
Module pin assignment
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Pin name
|
Pin number
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Function description
|
|
GND
|
1
|
GND
|
|
PD
|
2
|
Sleep control，
0： into sleep state
1： Running
|
|
PTT
|
3
|
PTT control
1：Receive；
0：Transmit
|
|
AF_OUT
|
4
|
Audio output
|
|
SQ
|
5
|
Squelch control
0: active
1:inactive
|
|
GND
|
6
|
GND
|
|
GND
|
7
|
GND
|
|
MIC_IN
|
8
|
Microphone input
|
|
TXD
|
9
|
UART_TXD
|
|
RXD
|
10
|
UART_RXD
|
|
GND
|
11
|
GND
|
|
ANT
|
12
|
Rf Antenna input;
|
|
GND
|
13
|
GND
|
|
BAT
|
14
|
Power supply: DC 3.3V - 5V
|
Typical application Block diagram
