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FMR15108
Eight-Channel 151MHz Receiver with Open Collector Outputs
Features
• Eight channel receiver with open collector outputs
• Supply voltage can be AC or DC
• Low current consumption
• Built-in noise or signal strength indicator
• User can select 8 different frequencies
• Momentary, Flip Flop and Latching modes are all user selectable
• Easy code setup with dip switch settings
• Optional QM100 bracket available for easy mounting to cases or walls. C160 case is also available
Application
• Pump Control
• Long distance panic button
• On/Off applications in agricultural devices
• Security alarm
• Basic Telemetry eg. Water level indication
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 Download Datasheet
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Description
The 151MHz receivers use dual conversion, narrow band FM which makes it ideal for industrial applications. Built into the receiver is a noise and signal strength indicator. The user selectable frequency synthesizer allows for easy installation on a frequency that is not in use, allowing optimal performance in the receiving range.
The receiver outputs are open collectors that are switched to ground when activated.
Case
The FMR15108 can be supplied without a case, this allows the receiver to be integrated according to your needs.
The C160 case and QM100 mounting bracket can be used to enclose the FMR15108 receiver. The receiver with a case is known as a FMR15108E.
Different Modes for each Output
Modes are user selectable from the 4-way dip switch, shown below.
Coding
The 12 way dip switch on the receiver sets the 12 bit unique code for the system. This has to be matched to that on the transmitter.
Signal Strength Indicator
The 151MHz receivers have five blue LED’s on the board. The table below indicates the level of the valid transmitted signal.
5 LED’s on |
-70dBm |
Very Strong signal |
Very Reliable operating conditions |
4 LED’s on |
-75dBm |
Very Strong signal |
Very Reliable operating conditions |
3 LED’s on |
-80dBm |
Very Strong signal |
Very Reliable operating conditions |
2 LED’s on |
-90dBm |
Strong signal |
Very Reliable operating conditions |
1 LED on |
-100dBm |
Good signal |
Reliable operating conditions |
Noise Strength Indicator
If more than 1 led is “ON” without a valid transmission, this indicates that there is noise on the frequency selected. Change the 3-way dipswitch on the receiver module to select a different frequency. The default setting is for 151.6MHz (All 3 dipswitches “ON”). Below is a table with the Dipswitch settings and the 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 |
Products in the Range
Technical Data
Supply Voltage |
11.0 to 28.0 Volts AC/DC.
Can use Elsema 12-volt AC power pack (12PP1000)
Supply lines should be less than 3 metres long to comply with radio frequency authorities |
Current Consumption |
35mA Standby at 12VDC, 30mA if all outputs “On”
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Receiver Type |
Dual Conversion Superheterodyne |
Receiving Frequency |
151.6MHz (8 selectable frequencies. See table above). |
Oscillation System |
VCO with 10ppm crystal controlled reference oscillator |
Operating Temperature Range |
-5 to 50°C |
IF Frequency |
10.7MHz |
| Sensitivity |
Better than 0.5uV (For output to activate) |
Selectivity |
Better than -6dB at ±25kHz |
Type of Demodulation |
Narrow-Bandwidth Frequency Modulation (FM) |
Occupied Bandwidth |
25kHz at -20dB |
| Outputs |
Eight Open Collectors (See chart for Collector Currents)
Chart indicates that eight outputs can be ON simultaneously with each output collector current being 125mA. Outputs can hold 40 Volts DC in “Off” state. |
Connection |
Supply, Antenna & Outputs - Screw type terminal block |
Antenna |
50Ω, 151MHz Antenna, Elsema ANT151M for maximum performance
A piece of approximately 1metre wire can be used for short range applications |
Dimensions |
90 X 70 X 15 mm |
Mounting Hole Size |
3.97mm or 5/32” |
Weight |
83g |
| Useable Transmitters |
All FMT151 series (with correct setting on the dip switch). See Transmitter datasheet for details. |
Useable Operating Range |
Up to 5000 metres, depending on installation and type of antenna used. Recommended Antenna is Elsema ANT151M |
Block Diagram
Application Notes
Care should be taken with the solid-state outputs that they are protected from inductive loads. This is done by connecting diodes across your DC inductive load.
Inductive loads such as DC relays must be clamped with a diode across the relay coil. If this is not done the spikes generated by the DC relay will lock-up the receiver. When a lock-up occurs you will need to remove the power and re-connect it.
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