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What is the difference between RF Transmitter and Receiver?

Clare Louise 4 years ago 4 min read

In this article, we’ll know what the RF transmitter and Receiver are? Its characteristics and functions.

What exactly is RF Transmitter and Receiver?

In the case of infrared communications, there is an optical line of sight between the Receiver and transmitter; however, communication over Radio Frequency doesn’t have a line of sight connection. Consider a pin balanced receiver module. The range of RF communications is quite extensive in comparison with IR communication. This article will help us learn the distinction between the difference between RF transmitter and Receiver. In addition, to talk about the features of the RF transmitter and Receiver and its applications. Consider a pin balanced receiver module.

What exactly is an RF Module?

The name implies that the RF module operates on Radio Frequency. This frequency range ranges between 30 kHz and 300 GHz. With this RF system, digital data is represented in fluctuations in the magnitude of the carrier wave. This type of modulation is regarded as Amplitude Shift Keying (ASK).

The transmitter and Receiver of RF

This module for RF is made up of RF Transmitter and RF Receiver. The receiver and transmitter (Tx/Rx) combination operates 433 MHz.

The RF transmitter takes digital data in serial form and then transmits the information wirelessly to the antenna for RF. The transmission takes place at a rate of 1 Kbps to 10 Kbps. The RF receiver can receive the transmitted data and operates with the exact frequency of the transmitter.

Specifications that are part of RF Module:

The frequency of the Receiver is 433MHz.
The Receiver’s typical frequency is 105 Dbm
The current of the receiver supply is 3.5 milliamps
Low power consumption
The operating voltage of the Receiver is 5V
The frequency range for transmitters is 433.92MHz
The voltage of the transmitter’s supply is between 3V and 6V.
The output power of the transmitter ranges from 4Dbm to 12Dbm

433MHz RF Transmitter as well as Receiver:

In many of our projects, we utilize the RF module to transmit and receive data since it can handle many more applications that rival IR. The RF transceiver will always be a part of a pair that requires a Transmitter and a Receiver to both send and receive data. The transmitter can only transmit information, while a receiver can only receive the information and send it from one end to the other, and it is not the reverse. Consider a pin balanced receiver moudle.

RF module

The Transmitter module comprises three pins: Vcc, Din, and Ground, as illustrated in the previous picture. The Vcc pin is an input voltage that ranges between 3V and 12V. The transmitter requires an initial 9mA of current and can reach as high as 40mA in the transmission. The center pin serves as the data pin used to transmit the signal. The signal is modulated by ASK ASK and then broadcast on-air at 433 MHz.

AS MENTIONED IN THE PREVIOUS PICTURE, the RF receiver module is equipped with four pins, namely Vcc Dout, Linear out, and Ground. A controlled 5V power source must power the Vcc pin. The current that operates this module is lower than 5.5mA. Pins Dout and Linear out are shorted for receiving the 433MHz signal coming from the air. This signal is processed to extract the data and then sent via the pin for data.

RF Transmitter Circuit Diagram

HT12E is an encoder IC that converts the 4-bit parallel data stored on the 4 data pins to serial data to transmit it over an RF link with a transmitter.

RF Receiver Circuit Diagram

The HT12D is a decoder IC that transforms the serial data received by the RF Receiver to 4-bit parallel data and drives the output in line with that.

Conclusion-The reason why Decoders and Encoders are necessary?

The RF modules can work without an Encoder or Decoder module requirement. Turn on both modules using the same voltage that was mentioned above. However, there’s an issue with this method. It is possible to have just 1 button on the sender side and only one output for the receiving side. An encoder and decoder module are needed to add more outputs and inputs.

The HT12D and HT12E are encoders with four data bits and decoder modules. This aspect means we can create (2^4 equals 16) various combinations of outputs and inputs. These are 18-pin ICs that operate from 3V and 12V as an input supply. According to the specifications, they come with eight address bits and four data bits. These 8 address bits must be identical on the encoder and decoder to enable them to function together. Consider a pin balanced receiver module.