433mHz Transmitter Receiver RF Radio Module

This hybrid 433Mhz RSI Wireless Transmitter Receiver Module designed based on an RF Transmitter and an RF Receiver used to transmit data at up to 3KHz from any standard CMOS/TTL source. An RF transmitter transmits serial data input wirelessly through its antenna connected at pin4. It transmits signals at the rate of 1Kbps – 10Kbps. The module consists of a SAW resonator tuned for 433.xx MHz operation. Moreover, there is a switching transistor and a few passive components to perform the functions.

This Radio Frequency (RF) module operates on Amplitude Shift Keying (ASK) with transmitter/receiver (Tx/Rx). The hybrid ASK Transmitter transmits this serial input through RF. Then the Receiver module receives the transmitted signal placed away from the source of transmission. Thus these RF signals transmitted at a particular frequency and a baud rate.  The RF receiver receives the transmitted data only if it operating at the same frequency as that of the transmitter. Moreover, this RF module has a wide range of applications in a Car security system, Remote key-less entry, Garage door controller, Home security, Wireless mouse, Automation system.

The transmitter module consists of an RF tuned circuit and a couple of OP Amps to amplify the received carrier wave from the transmitter.  The transmitter module is quite simple to operate and offers low current consumption of 11mA. Data can be supplied directly from a microprocessor or encoding device, thus keeping the component count down and ensuring a low hardware cost. Vcc provides power to the transmitter at a DC voltage range of 3.5V to 6V. Due to the fact that the RF output is proportional to the input voltage. As a result, the higher the voltage, the wider the range.