ELSEMA
12 Volt 1 Watt 27MHz Transmitter - FMT-312E, FMT-31202E, FMT-31204E
FMT-312E, FMT-31202E, FMT-31204E
12V 1Watt 27MHz Transmitter
Features
• 3 versions – 1-channel (FMT-312E), 2-channel (FMT-31202E) and 4-channel (FMT-31204E)
• 1 Watt Transmitter with current consumption of 300mA
• Long range – up to 3km
• Specially programmed micro-controller
• Durable alloy metal case
Application
• Pump Control
• Long distance panic button
• On/Off applications in agricultural devices
• Security alarm
• Basic Telemetry eg. Water level indication
FMT-312E
Description
The FMT-3… series has
3 versions
- 1-channel (FMT-312E), 2-channel (FMT-31202E) and 4-channel (FMT-31204E)
No case versions
are also available - 1-channel (FMT-312), 2-channel (FMT-31202) and 4-channel (FMT-31204)
The FMT-3… has a
1-watt transmission
with a
current consumption of 300mA.
The FMT-3… series is designed to give a controlled range of up to 3km. The controlled operation can be any electronic or
electrical operated device when used with the FMR-… series of receivers.
The transmitter uses a specially programmed
micro-controller,
which ensures the highest reliability, low sleep mode current
(10uA) consumption and greater flexibility.
The FMT-312 transmitter is the
PCB assembly
only, while the FMT-312E transmitter is enclosed in an alloy metal case.
External supply connection
and SO239
antenna socket
is provided with the transmitter.
The
transmitter modes
are user selectable by simply setting the 2-Way dip-switch on the transmitter board.
Products in the Range
FMT-312E
FMT-31202E
FMT-31204E
FMT-312
FMT-31202
FMT-31204
Warning - Do not transmit without an
antenna
-1-
ELSEMA
12 Volt 1 Watt 27MHz Transmitter - FMT-312E, FMT-31202E, FMT-31204E
Installation Instructions
Off Delay 2 – 62 seconds
Transmitter will transmit a 1.5 second transmission burst and then stop for the "off delay" time selected. The
"off delay" time is user selectable between 2 to 62 seconds by adjusting trimpot on the transmitter board. If
the code changes during the "off delay" period the new code will be transmitted immediately. When the "off
delay" time lapses, transmitter will transmit another burst. The transmitter will cycle (transmission and off
delay) indefinitely, if at least one code switch from the 12-Way code switch is ON and supply is connected.
Off Delay 1 – 10 minutes
Same as mode 1 except the "off delay" is user selectable between 1 to 10 minutes.
Continues Transmission
Transmitter will transmit continuously, if at least one code switch from the 12-Way code switch is ON and
supply is connected. A transmission limit of five minutes is used to comply with local radio regulations.
To activate a receiver longer than 5 minutes, use a delay off feature in the receiver (FMR-212T) and
transmitter. The delay off feature in the receiver needs to be set more than the transmitter. This ensures that
the transmitter keeps resetting the off delay in the receiver.
1.5 – 10 seconds one burst transmission
Transmitter will transmit one burst and then go to standby or sleep mode. Adjusting the trimpot will vary the
burst length. When the code is changed and supply is connected, transmitter will emit one new burst of the
new code.
Sleep mode (10 uA) is activated when all 12 code switches are OFF; this applies to all four modes.
(Grey illustrates the position of the DIP switches)
Technical Data
Power Supply
11 to 13.6 VDC (for constant RF-Output), screw type terminal. Absolute maximum 14VDC.
Nominal 300mA at 12VDC supply (Transmitting)
Nominal 12mA on standby
Less than 10uA on sleep mode (only when all code switches are OFF otherwise it is on
standby)
27.145MHz (Other frequencies available on 27.045, 27.195 and 27.455 MHz. The 27.455
frequency is not available for Australia).
Crystal controlled, 30 parts per million (0 to 50°C).
1 Watt, into 50 ohms SO239 socket at 13.6VDC.
SO239 socket is provided. Optimum performance use Elsema ANT27L antenna
Narrow-band-width Frequency Modulation (5K00F1D)
1500 Hz non-return to zero
1 kHz (0.96 ms/bit) (15% tolerance)
-13dBm (50uW)
±2.5 kHz
On-board 12-way code switch
Code switch is inserted into an IC socket. This is for the easy removal of the code switch.
Elsema’s coding cable can be inserted into the IC socket, which enables the user to have 4096
digital channels.
-2-
Current Consumption
Operating Frequency
Carrier Frequency Tolerance
R.F. Output Power
Antenna
Type Of Emission
Frequency Deviation Limiting
Modulation Frequency
Spurious Transmission
Necessary Band Width
Digital Coding System
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