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The T5 and R5 data link modules are miniature UHF radio modules, which enable the implementation of a simple telemetry link upto 300 metres, and at data rates of up to 128Kbit/s. The receiver is based on the classical superhet single conversion architecture utilising a PLL xtal referenced oscillator which yields a highly stable IF frequency (10.7 MHz). This hence allows use of high Q bandpass filters offering excellent adjacent channel rejection and hence high interference Immunity. RF GND (pin 1) RF ground pin, internally connected to pin 4 (0V). This pin should ideally be connected to the nearest ground plane (e.g. coax braid, main PCB ground plane etc.). RF IN (pin 1) 50? RF input from antenna, connect using shortest possible route. This input is isolated from the internal circuit using the air gap of the front end SAW RF filter. RSSI (pin 3) The Received Signal Strength Indicator provides a DC output voltage proportional to the RF input signal. The amplitude of the RSSI voltage increases with increasing RF signal strength. The data slicer is optimised for a 50:50 duty cycle, hence for reliable communications data should be encoded using a suitable scheme such as Manchester Encoding, though pulse width modulation up to 30:70/70:30 can also be utilised. Antenna Design The design and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. The following will assist the designer in maximising system performance. Helical Antenna, Whip Antenna, Antenna Configurations To Be Used With The T5 & R5 Modules. Carrier Detect circuit The R5 RSSI output provides a DC output proportional to the RF input signal. In order to generate a Carrier Detect (as a logic level) The following circuit may be used.
Tags : pulse width modulation, fm radio transmitter, interference immunity, data slicer, whip antenna, channel rejection, rf filter, rf input, antenna design, air gap, rf signal, logic level, telemetry link, manchester encoding, link modules
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