YS-C20S Cheap RF module /small size

Product Name; YS-C*0S 
Specifications: *0mW output, **3/**8/**5Mhz, small size
Brief Introduction:Small size, spring antenna
 
    Product Description

1. Specifications
  * RF power: ≤*0mW/ *0dBm;
  * Receiving current: <*0mA;
  * Transmitting current: ≤*0mA;
  * Sleep current: <*0uA;
  * Power supply: DC 5V;
  * Carrier frequency: **3/**0/**8/**5MHz optional;
  * Interface: TTL/UART only;
  * Receiving sensitivity: ***0 dBm (@***0bps); ***8 dBm (@***0bps);
* Size: *8mm×*5mm×*0mm (without data pin & antenna port, spring antenna).
* Weight: *5g
  * Range: ≤0.4Km (BER=***3@***0bps,when antenna is 2m above ground in open area),
          ≤0.6Km (BER=***3@***0bps,when antenna is 2m above ground in open area).
 
2. Products Main Features
  * Multi-channels: 8 channels, expandable for *6/*2 channels;
  * Baud rate in air: ***0/***0/***0/***0/****0bps, set before delivery;
  * Transparent data transmission: What has been received is exactly what has been transmitted, suitable for any standard or non-standard user protocols;
  * Interface format: 8N1/8E1/**1 user-defined, or customization for other format interface;
  * Modulation: GFSK. Based on the Gaussian Frequency Shift Keying (GFSK) modulation, High anti-interference and Low BER (Bit error Rate);
  * Half duplex: Integration of receiver and transmitter,*0ms auto change for receiving and sending;
  * Low power consumption and sleep function;
  * Widen Temperature: **5°C~**5°C (TCXO , **1~**7 F) ;
  * Frequency Stability: ±2.5ppm Industrial
  * Working humidity: *0%~*0% relative humidity without condensation;
3. Application areas
  * Automatic meter reading(AMR),
  * Wireless smart terminal: POS, PDA,
* Wireless alarm and security systems , PTZ,
* Wireless electronic display screen, LED display,
* RS***5 wire multi-drop system changeover wireless system;
  * Wireless remote control, Environment monitors, telemetry system;
  * Check attendance system, Queue-management system and positioning in coal mine;
  * Industrial automatic data collection, Wireless Data Acquisition, Wireless sensor, SCADA.
4. Installation dimension
5. Interface pin out definition
Pin No. Pin name Description Level Connection with terminal Remands
1 GND Grounding of power supply   Ground  
2 Vcc Power supply DC *3.3~5.5V    
3 RXD/TTL Serial data receiving end TTL    
4 TXD/TTL Serial data transmitting end TTL  
5 Sleep Sleep control () TTL  Sleep signal Low level sleep
6 Test Ex-factory testing   null  

Communcation Match with YS-C*0 & YS-C*0 series radios.