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FMR-201
27MHz FM Receiver, PCB Strip Receiver with Open Collector Output
Features
• Crystal Controlled
• Low supply voltage, highest reliability, low power drain
• Single Channel Receiver
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Description
The FMR-201 is a crystal controlled single channel receiver, comprising of receiving, decoding and open collector output sections. A specially designed LARGE SCALE INTEGRATED CIRCUIT (LSI) is employed in the decoder section, which ensures operation at low supply voltage, highest reliability, associated with very low power drain.
The receiver works on a digitally encoded 27 MHz frequency modulated (FM) signal. It may be used in an application that requires the 27MHz receiver to be mounted on a printed circuit board.
If the code of the input signal (from a transmitter) matches the setting of the coding switch on the receiver (up to 4096 combinations), an output is obtained i.e. the open collector is switched to ground.
Connection to the receiver is via a six-way female connector. The male connector can be soldered onto any type of printed circuit board, requiring a 27 MHz receiver. The male connector is available as a Nylon 6-way male low profile connector, part number 6WLP or high profile connector part number 6WHP. See design dimensions page for more details.
A proper 27 MHz CB-Antenna will give a reliable control range of up to 200 metres, when used with Elsema’s FMT-301, FMT-302, FMT-304 transmitters. If a CB-Antenna is used, the shield of the cable must be connected to the "minus terminal". .
The default mode is in momentary mode, i.e. the output transistor is only activated while the correct signal is received. When a flip/flop mode (toggling the output every correct incoming signal) is required the flip/flop link should be soldered into the receiver. In flip/flop mode, the output transistor is on at the initial "power-up".
Care must be taken, not to bring a receiver near strong magnetic fields, such as DC-Motors, speakers, magnets for reed switches, transformers etc. as it would magnetise the coils and may cause severe de-tuning.
Technical Data
| Supply Voltage |
7.5-20VDC, absolute max +30VDC |
| Current Consumption |
10mA stand by |
| Receiving Frequency |
27.145MHz (Other freq. available: 27.045, 27.195 & 27.455MHz. NB. 27.455 freq. is not available for Australia ) |
| Type of Crystal Used |
26.690MHz, 3rd overtone, 20pF, 30ppm at 0-50°C |
| IF Freq |
455kHz |
| Selectivity |
At least -40dB at ±10kHz |
| Sensitivity |
Better than 1uV (for transistor to switch on) |
| Type of demodulation |
Narrow-bandwidth Frequency Modulation (FM) |
| Band Width |
±2.5kHz |
| Decoding System |
Onboard 12-way coding switch (4096 digital channels) |
| Output |
Transistor output maximum-swithcing 100mA/40VDC
Transistor is normally "off", it switches "on" if correct code is received
Joining "AL" tracks on copper side of PCB will change output from "momentary" to "alternating" |
| Connections |
6-way female connector type
Male connector is soldered to a PCB |
| Antenna |
50 ohms, 27MHz CB-Antenna or approximately 300mm long wire for short range applications. |
| Dimensions |
88 x 43 x 15mm |
| Mounting Hole Size |
3.97mm or 5/32" |
| Mounting Hole Spacing |
Length 81.28mm (3.2")
Width 35.56mm (1.4") |
| Weight |
28.5g |
| Compatible Transmitters |
FMT-... series |
NB:
All input & outputs are protected against possible transients or static charges
If antenna is a piece of wire, install away from metal parts
Keep coils L1 & L2 away from magnetic components such as speakers, motors, transformers etc
Do not change factory tuning of L1 & L2 coils
Circuit Diagram
Dimensions
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