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TXM-418-5 Datasheet(PDF) 9 Page - Radiometrix Ltd |
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TXM-418-5 Datasheet(HTML) 9 Page - Radiometrix Ltd |
9 / 11 page Radiometrix Ltd, SILRX-UHF Data Sheet page 9 AF output This output is the FM demodulator’s output after buffering and filtering. Since it is taken before the data slicer in the module, it may be used to drive external data slicers / demodulator’s in cases where the internal data slicer is not suitable. This is the case where an analogue subcarrier is being employed e.g. 2 tone AFSK or DTMF tones. In these cases the AF output is used to drive the FSK / DTMF decoder directly. The AF output is also a very useful test point for monitoring signals or interference. The AF output is DC coupled to the FM demodulator thus the DC level Varies with the frequency of the incoming signal. Supply requirements The module requires a clean supply. Noise and ‘hash’ in the 5 to 500 kHz band and 16 MHz ±1 MHz must be less than 2 mV, We recommend a 10 µF capacitor to ground on pin 5 (Vcc) and a 10Ω series feed resistor in cases where the cleanness of the supply is in doubt. . Additional Reading BS 0799 British standard for Wire-free intruder alarm systems BS 4737 British standard for intruder alarm systems in buildings from British standards institution - Tel. 44 171 629 900 MPT1340 DTI type approval specification for 418 MHz Telemetry from department of Trade and Industry - 44 171 211 0502/0505 ARRL Handbook Excellent radio engineering text ARRL Antenna Book Practical antenna design book Warning: Don’t be tempted to adjust the trimmer on the module, it controls the receive frequency and can only be correctly set-up with an accurate RF signal generator! |
Similar Part No. - TXM-418-5 |
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Similar Description - TXM-418-5 |
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