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WHAT IS RF MODULE?

By Admin on


DEFINATION OF RF MODULE

An RF Module is a small electronic circuit which is used to receive, transmit or transceive radio waves on one of a number of carrier frequencies. It contains RF transmitter and Receiver.

RF MODULE(TRANSMITTER AND RECEIVER)

The wireless systems designer has two overriding constraints, it must operate over a certain distance and transfer a certain amount of information within a data rate. The RF modules are very small in dimension and have a wide operating voltage range(3V-5V).

Basically the RF modules are 433 MHz RF transmitter and receiver modules. The transmitter draws no power when transmitting logic zero while fully suppressing the carrier frequency thus consume significantly low power in battery operation. When logic one is sent carrier is fully on to about 4.5mA with a 3volts power supply. The data is sent serially from the transmitter which is received by the tuned receiver. Transmitter and the receiver are duly interfaced to two microcontrollers for data transfer.

RF TRANSMITTER

We use RF modules for transmit and receive the data because it has high volume of applications than IR. RF signals travel in the transmitter and receiver even when there is an obstruction. It operates at a specific frequency of 433MHz.

RF transmitter receives serial data and transmits to the receiver through an antenna which is connected to the 4th pin of the transmitter. When logic 0 applied to transmitter then there is no power supply in transmitter. When logic 1 is applied to transmitter then transmitter is ON and there is a high power supply in the range of 4.5mA with 3V voltage supply.


RF RECEIVER

APPLICATIONS OF RF MODULE

Automation system


Wireless security systems


Car alarm systems



SPECIFICATIONS OF RF TRANSMITTER AND RECEIVER

  • Receiver frequency: 433 MHz
  • Receiver typical sensitivity: 105Dbm
  • Transmitter frequency range: 433.92MHz
  • Transmitter supply voltage: 3V~6V
  • Transmitter output power: 4~12Dbm
  • Receiver current supply: 3.5 mA
  • Receiver operating voltage: 5V
  • Low power consumption.


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