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R5-434-5-128 Datasheet(PDF) 6 Page - rfsolutions.ltd |
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R5-434-5-128 Datasheet(HTML) 6 Page - rfsolutions.ltd |
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6 / 8 page  FM Radio Transmitter & Receiver Modules T5 / R5 DS305-8 Nov ‘05 ©2005 REG No 277 4001, England. Page 6 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. The antenna should be kept as far away from sources of electrical interference as physically possible. If necessary, additional power line decoupling capacitors should be placed close to the module. The antenna ‘hot end’ should be kept clear of any objects, especially any metal as this can severely restrict the efficiency of the antenna to receive power. Any earth planes restricting the radiation path to the antenna will also have the same effect. Best range is achieved with either a straight piece of wire, rod or PCB track @ ¼ wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the ¼ wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax Figure 3: Antenna Configurations To Be Used With The T5 & R5 Modules RSSI Values: The R5 RSSI output provides a DC output proportional to the RF input signal. The table below shows the typical RSSI value depending on the RF signal strength. The circuit diagram shows how a carrier detect can be obtained from the RSSI pin on the receiver module. RF Signal Strength / dBm RSSI / V RF Signal Strength / dBm RSSI / V -120 1.27 -110 1.33 -100 1.49 -90 1.74 -80 1.99 -70 2.3 -60 2.56 -50 2.63 -40 2.63 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. RF RF Helical Antenna Whip Antenna 34mm @ 433MHz 17 turns equally spaced ∅ = 5mm (inside) 15.5cm @ 433MHz CD 5V GND 10 K ohm 39 K ohm 62 K ohm RSSI OUT PIN 3 |
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