Elsema FMR-201 : 27MHz FM Receiver with Open Collector Output

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.

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The receiver works on a digitally encoded 27 MHz frequency modulated (FM) signal. It may be used in applications which 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 receptacle is the Molex M2373-6A connector, which can be soldered onto any type of printed circuit board, requiring a 27 MHz receiver. As an antenna, a piece of any type of wire, approximately one meter long, will be sufficient for a reliable control range of up to 400 metres, with our FMT... series hand transmitters. A longer wire or a proper 27 MHz CB-Antenna should further improve performance in reception. 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 "AL" tracks on the copper side of the receiver must be joined. 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 magnetize the coils and may cause severe de-tuning.

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