8-Channel 151MHz Receiver with Open Collector Outputs, FMR15108
FMR15108
8-Channel 151MHz Receiver with Open Collector Outputs
Features
- Eight channel receiver with open collector outputs
- The supply voltage can be 12 – 24 Volts AC or DC
- Low current consumption
- Built-in noise or signal strength indicator
- Users can select 8 different frequencies
- Momentary, Latching and Security latching modes are all user selectable
- Easy code setup with dip switch settings
- An optional QM100 bracket is available for easy mounting to cases or walls. C1015 or C1020 case is also available
Applications
- Pump Control
- Long distance panic button
- On/Off applications in agricultural devices
- Security alarm
- Basic Telemetry eg. Water level indication
Description
This receiver gives you eight open collector outputs. The output mode can be set to momentary, latching or security latching.
The user can select 8 different narrow-band frequencies and program an unlimited number of transmitters to the receiver. With a narrow band FM 151MHz signal from the transmitter a line of sight operating range of 5000 meters is possible. The receiver uses a crystal oscillator circuit that ensures high-frequency stability allowing optimal performance in the receiving range.
Different Modes for each Output
Modes are user selectable from the 4-way dip switch, shown below.
| DIP Switch Mode Settings The output relay will respond in the following manner when receiving the correct signal from a transmitter | |
 | “All ‘All Momentary”: Relay on, only while the correct signal is received |
 | “All Latching”: Outputs alternate at every correct incoming signal |
 | “Momentary & Latching”: Outputs 1-4 are momentary & 5-8 are latching |
 | “Security Latching on”: Outputs will be on until supply to the receiver is momentarily interrupted |
 | “Momentary & Latching “: Outputs 1-6 are momentary & 7-8 are latching |
 | “Momentary & Latching “: Outputs 1-2 are momentary & 3-8 are latching |
 | “Momentary & Latching “: Outputs 1-3 are momentary & 4-8 are latching |
 | “Security Latching on”: Output I is security latching & 2-8 are momentary |
 | ” Security Latching on “: Output 1-7 is latching & 8 is momentary. |
Momentary – Output is active for as long as the transmitter button is pressed.
This is a standard mode on most automatic gates or garage door openers.
Latching – Output remains active until the next press of the transmitter button.
Similar to switching “on” and “off” a light.
Security Latching – Output remains active until power to the receiver is removed. Similar to security alarms and fire alarms.
Customized Software
Custom output modes can be programmed to do special functions. Call Elsa for more details.
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. Do not use the factory default code.
Signal Strength Indicator
The 151MHz receivers have five blue LEDs 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.
Following is a table with the Dipswitch settings and the corresponding 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 r | 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 | 12 — 24 Volts AC or DC. Can use Elsema’s AC power pack (12PP-1000) Supply lines should be less than 3 meters long to comply with radio frequency authorities. |
| Current Consumption | 22mA Standby at 12VDC, 35mA if all outputs “On” |
| Receiving Freq | 151.6MHz (8 selectable frequencies. See table above) |
| Operating Temperature Range | -5 to 50°C |
| Sensitivity | Better than 0.5uV (For output to activate) |
| Type of Demodulation | Narrow-Bandwidth Frequency Modulation (FM) |
| Output | Eight Open Collectors (See chart for Collector Currents)
|
| Connections | Supply, Antenna & Outputs – Screw-type terminal block |
| Antenna | 500, 151MHz Antenna, Elsema ANT151M for maximum performance A piece of approximately 1 meter wire can be used for short-range applications |
| Dimensions | 90 X 70 X 15 mm |
| Mounting hole size | 3.97 mm or 5/32″ |
| Weight | 83g |
| Microcontroller | Can be re-programmed to suit your customized needs |
| Useable Transmitters | All FMT 151 series (with the correct setting on the dip switch). See Transmitter datasheet for details. |
| Useable operating range | Up to 5000 meters, depending on installation and type of antenna used. Recommended Antenna is Elsema ANT151M |
Products in the Range
 |  |  |  |
| FMR15101 1-Channel | FMR15102 2-Channel | FMR15101240 1- Channel 240VAC Supply | FMR15102240 2- Channel 240VAC Supply |
 |  |  |  |
FMR15104 | FMR15108 8-Channel | FMR1510812R 8-Channel, 12V Supply | FMR1510824R 8-Channel, 24V Supply |
Block Diagram
FMR15108
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 can lock-up the receiver. When a lock-up occurs you will need to remove the power and re-connect it.
Manufactured by
Elsa Pty Ltd
31 Tarlington Place, Smithfield
NSW 2164, Australia.
Ph: 02 9609 4668
Website: http://www.elsema.com
Documents / Resources
 | ELSEMA FMR15108 8 Channel 151MHz Receiver with Open Collector Outputs [pdf] User Manual FMR15108, 8 Channel 151MHz Receiver with Open Collector Outputs, FMR15108 8 Channel 151MHz Receiver with Open Collector Outputs, 8 Channel 151MHz Receiver, 151MHz Receiver, Receiver |
 | ELSEMA FMR15108 8-Channel 151MHz Receiver with Open Collector Outputs [pdf] Instruction Manual FMR15108 8-Channel 151MHz Receiver with Open Collector Outputs, FMR15108, 8-Channel 151MHz Receiver with Open Collector Outputs, Open Collector Outputs |
