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R15105
151.600MHz FSK Radio Data Receiver
Features
• 7 frequencies selectable via 3 way dip switch
• LED Signal Strength Indicator
• Receivers digital data
• Baud rates 40 - 4800bps
• Low cost, small size, low current consumption
Applications
• Telecommand Systems
• Security Systems
• Alarms
• Radio Data Communications
• Commercial / Industrial Telemetry |
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 Download Datasheet
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Description
The R15105 is a radio data receiver to receive digital data. Baud rates of 40 to 4800 bps can be received. The low cost, small size, low current consumption makes it ideal for various applications.
The R15105 Data receiver has signal strength LED indicators which show the strength of the receiving signals. During installations if more then 3 LED’s are ON without any transmission, than the user should switch to a different frequency. This indicates that there is interference and your receiving range will be greatly reduced.
The frequency can be changed by setting the 3-way dipswitch on the receiver module. The transmitter should also have the same setting as the receiver in order to operate. Below is a picture showing the location of the 3-way dipswitch and a list of frequencies.
Frequency |
1 |
2 |
3 |
151.600 MHz |
On |
On |
On |
152.375 MHz |
Off |
On |
On |
151.775 MHz |
On |
Off |
On |
151.400 MHz |
Off |
Off |
On |
151.175MHz |
On |
On |
Off |
151.025 MHz |
Off |
On |
Off |
150.900 MHz |
On |
Off |
Off |
150.825 MHz |
Off |
Off |
Off |
Technical Data
| Supply Voltage |
4.5 to 5.5 Volts DC. Absolute maximum 6.0VDC |
| Current Consumption |
28mA |
| Receiver Type |
Dual Conversion Superheterodyne |
| Receiving Freq |
151.6MHz (8 selectable frequencies). |
| Oscillation System |
VCO with 10ppm crystal controlled reference oscillator. |
| Operating Temperature Range |
-5 to 50°C |
| 1st IF Freq |
10.7MHz |
| 2nd IF Freq |
455 KHz |
| Selectivity |
Better than -6 dB at + - 25 KHz |
| Image Rejection |
Better than -40dB at 130.200 |
| Sensitivity |
-112dBm or 0.6µV |
| Type of Demodulation |
Narrow-band-width Frequency Modulatio (FM) |
| Occupied Band Width |
25KHz at -20dB. |
| Baud Rate |
40 to 4800 bps with 50% duty cycle |
| Data Output Level |
0-5V |
| Frequency Response |
20 to 2400Hz |
| Dimension |
38 x 26 x 28mm |
| Weight |
22 grams |
| Usable Transmitter |
T15105 Data Transmitter |
| Antenna |
50 ohms, 151MHz Antenna |
Connection Diagram
R15105 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 R15105 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 T15105 transmitter and R15105 receiver.
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