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R433E
433.920MHz ASK Radio Data Receiver
Features
• Receives ASK digital data
• Baud rates 300 - 4800bps
• Low cost, small size, wide operating voltage, low current consumption
Applications
• Telecommand Systems
• Security Systems
• Alarms
• Radio Data Communications
• Commercial / Industrial Telemetry
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R433
Radio Data Receiver, No Case |
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Description
The R433E is a radio data receiver to receive digital data. Baud rates of 300 to 4800 bps can be received. The low cost, small size, wide operating voltage combined with low current consumption makes it ideal for various applications.
The receiver is available with a plastic case or as a Printed Circuit Board assembly. The Printed Circuit Board assembly allows OEM manufactures to integrate the receiver with their own products.
Technical Data
| Power Source |
8.0 to 28.0 Volts DC. |
| Current Consumption |
14mA |
| Operating Freq |
433.920MHz |
| Receiver Type |
Superheterodyne |
| Oscillation System |
VCO with 10ppm crystal controlled reference oscillator. |
| Operating Temperature Range |
-5 to 50°C |
| IF Freq |
320KHz |
| Selectivity |
-3dB at ±20kHz |
| Sensitivity |
Better than -107dBm or 1µV |
| Type of Demodulation |
Amplitude Shift Keying. (ASK) |
| Occupied Band Width |
25KHz at -20dB. |
| Baud Rate |
300 to 4800 bps with 50% duty cycle |
| Data Output Level |
0-5V |
| Frequency Response |
150 to 2400 Hz with 50% duty cycle (Other duty cycles will degrade sensitivity) |
| Antenna |
50 ohms, 433.920MHz Antenna (ANT433S) or piece of approximately 70cm of wire |
| Connections |
Supply & Data Out: 3- way screw type terminal block (R433 without case); 4-pole Mic socket (R433E with case).
Antenna: 50 ohms, 433.920 MHz Antenna (ANT433S) or piece of approximately 70 centimetres of wire. |
| Dimension |
115 x 80 x 58mm excluding Antenna & mounting bracket |
| Weight |
200g excluding Antenna & mounting bracket |
| Mounting Bracket |
Brass bracket suitable to clamp onto Antenna pole |
| Usable Transmitter |
T433E Data Transmitter |
Dimensions
R433 Output Circuit Diagram
R433E Data Format
It is important to input the correct data format otherwise the receiver will have a lower sensitivity which will result in a reduced transmission range.
The R433E receiver data slicer is set for 50/50-duty cycle, therefore the “data in” should have a 50/50-duty cycle. The 50/50-duty cycle data can be pulse-width modulated to transmit resets, 0's or 1's. See diagram below :
A 50/50-duty cycle will have an average DC signal resulting in a constant reference for the data slicer. Users should use pulse-width modulation to transmit data with logic 1's or 0's.
If a different duty cycle is used, for example 66/33 ( Manchester format) the data slicer in the receiver will try to adjust itself to the average DC signal. Since this average DC signal is changing with different data bits this will result in a constantly changing reference for the data slicer, resulting in lower sensitivity. See diagram below :
Only 50/50 duty cycle data is suitable for the T433E transmitter and R433E receiver.
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