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PLT Datasheet(PDF) 10 Page - Radiometrix Ltd |
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PLT Datasheet(HTML) 10 Page - Radiometrix Ltd |
10 / 12 page Radiometrix Ltd PLT/PLR Data Sheet page 10 RX Received Signal Strength Indicator (RSSI) The PLR receiver has wide range RSSI that measures the strength of an incoming signal over a range of 60dB or more. This allows assessment of link quality and available margin and is useful when performing range tests. The output on pin 5b of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.5V at maximum indication (RF input levels of -40dBm and above). ∆Vmin-max is typically 2V and is largely independent of standing bias variations. Output impedance is 40kΩ. Pin 5b can drive a 100µA meter directly, for simple monitoring. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 RF level (dBm) Figure 8: typical RSSI level with respect to received RF level at PLR antenna pin Antenna requirements Three types of integral antenna are recommended and approved for use with the module: A) Whip This is a wire, rod ,PCB track or combination connected directly to RF pin of the module. Optimum total length is 16.4cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well away from metal components to prevent serious de-tuning. Whips are ground plane sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and plastic cased B) Helical Wire coil, connected directly to RF pin, open circuit at other end. This antenna is very efficient given it’s small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the wire length or expand the coil for optimum results. The helical de-tunes badly with proximity to other conductive objects. C) Loop A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de- tuning. Feature A B C whip helical loop Ultimate performance *** ** * Easy of design set-up *** ** * Size * *** ** Immunity proximity effects * ** *** Range open ground to similar antenna 500m 200 100 |
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