23-09-2013, 04:46 PM
The RX433 (Receiver Module)
DESCRIPTION
The receiver shown in Figure also contains just one transistor. It is biased to act as a regenerative oscillator, in which the received antenna signal causes the transistor to switch to high amplification, thereby automatically arranging the signal detection. Next, the ‘raw’ demodulated signal is amplified and shaped-up by op-amps. The result is a fairly clean digital signal at the output of the receiver. The logic high level is at about 2/3 of the supply voltage, i.e., between 3 V and 4.5 V.
The range of the simple system shown in Figures is much smaller than that of more expensive units, mainly because of the low transmit power (approx. 1 mW) and the relative insensitivity and wide-band nature of the receiver. Moreover, amplitude-modulated noise is not suppressed in any way.
This is a SR series of radio frequency module which can facilitate the OEM designers to design their applications in remote in the quickest way. The circuit is designed with SMD components and the module size is small enough to be able to be fitted inn many remote control applications. This compact receiver module is very sensitive and heavy immune to other radio interference. Wide operating voltage, low current makes this module ideal for battery operated or miniature instrument design application. This miniature module is specially designed for rigid application. It shows high stability and reliability even at worst environment conditions. Direct plug and use to the mother board makes the receiver for various design applications.
FEATURES
Range in open space (Standard Conditions): 100 Meters
RX Receiver Frequency: 433 MHz
Low Power Consumption
Easy For Application
RX Operating Voltage: 5V
TX Frequency Range: 433.92 MHz
TX Supply Voltage: 3V ~ 6V
ANTENNA CONSIDERATIONS:
The simplest antenna consists of a piece of wire approximately 6 to 7 inches long. If you desire more range you can try a ground plane antenna or a Yagi such as the Ramsey 400-4 model. The antenna should be tuned for the 433 MHz band for best operation.
Having two Yagi antennas, one for the transmitter and one for the receiver will allow you to extend the range considerably, but since they are directional, this would be best for if your receiver and transmitter are in fixed positions.