Product Outline
The SR-FRS-1WV (VHF) is a low cost but high performance integrated walkie 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 1W output. 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 have the data transfer ability there are 2 modes: the data/SMS transfer ability; up to 100 byte can be sent at one time; it is compliance with the standard UART transfer protocol. DTMF transfer, 0-9,A-F, total 16 digits can be sent.
Product performance:
- FM demodulation technique based on digital signal processing technology
- Frequency Range：VHF 136M-174M
- Frequency step：5K/6.25K/12.5K/25K
- RF Output Power：1W/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：18 x 35 x 3.2 mm
- Communication distance：more than 3KM 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
|
J1 pin name
|
Pin number
|
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 sleep state
1： Running
|
|
H/L
|
7
|
RF transmit power selection；
0： 0.5W;
NC： 1W;
Note: if you want a 1w power ,just leave this pin NC, it can’t be pull 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.
