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FMR15104
4 Channel 151MHz Receiver
Features
• Four channel receiver with relay outputs
• Supply voltage can be AC or DC
• Low current consumption
• Built-in noise or signal strength indicator
• User can select 7 different frequencies
• Momentary and Flip Flop modes are all user selectable
• Easy code setup with dip switch settings.
• Optional QM150 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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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 relays that are voltage free allowing the user to connect any voltage up to 240VAC with currents of 8 amps.
Modes
The four dip switches correspond to the respective relays. Switch 1 for relay output 1, switch 2 for relay output 2 and so forth.
1. Momentary Mode
If the dipswitch is off the relays will be in momentary mode.
2. Flip Flop Mode
If the dipswitch is on the relays will be in flipflop mode.
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.
Apart from the 12 way dip switch there is an additional 1 way dip switch :
This 1 way DIP switch on the right side of the 12 way dip switch denotes the channels. See table below.
Generally to use a 4 channel Tx to 4 channel Rx match all the 13 dip switch (12way + 1way just on the right side of the 12 way).
To use an 8 channel tx to control 2 x four channel Rx match all the 12 dip switch and switch 13 off will 1 Tx and switch 13 on will use the other Tx.
FMR15104
1-Way DIP Switch & Four Relay Outputs
SW13 |
Channel |
OFF |
1 |
OFF |
2 |
OFF |
3 |
OFF |
4 |
ON |
5 |
ON |
6 |
ON |
7 |
ON |
8 |
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 - 28.0 VDC
10.0 - 28.0 VAC
Can use Elsema AC power pack (12PP1000 / 24PP)
Supply lines should be less than 3m long to comply with radio frequency authorities |
Current Consumption |
35mA Standby at 12VDC
130mA if all relays “ON” at 12VDC |
Receiver Type |
Single 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 relay to activate) |
Selectivity |
Better than -6dB at ±25kHz |
Type of Demodulation |
Narrow-Bandwidth Frequency Modulation (FM) |
Occupied Bandwidth |
25kHz at -20dB |
| Output |
Four change over relay outputs, rated at 8 Amps/240 Volts |
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 |
130 x 70 x 20mm |
Mounting Hole Size |
3.97mm or 5/32” |
Weight |
100g |
| 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
FMR15104 12/24 VAC/DC Application
FMR15104 110/240 VAC Application
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