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QFMR5-434-128 Datasheet(PDF) 5 Page - rfsolutions.ltd |
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QFMR5-434-128 Datasheet(HTML) 5 Page - rfsolutions.ltd |
5 / 6 page FM Radio Transmitter & Receiver Modules T5 / R5 DS305_2 April 01 © ©2001 REG No 277 4001, England. Page 5 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 QFMT5 & QFMR5 Modules Application Circuit The application circuits show how the QFMT5 transmitter and the QFMR5 receiver can easily be integrated into a system to form a wireless link. T5 A0 A1 A2 A3 A4 A5 A6 A7 VSS AD8 AD9 AD10 AD11 TE\ OSC2 OSC1 DOUT VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 HT12E ROSC +5V 4 5 1 2 3 +5V ANTENNA Figure 4: QFMT5 Transmitter Application Circuit Figure 5: QFMR5 Receiver Application Circuit RSSI Values: The QFMR5 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. RF Signal Strength / dBm RSSI / V -110 tba -100 -90 -80 -70 -60 -50 -40 -30 -20 RF RF Helical Antenna Whip Antenna 34mm @ 433MHz 17 turns equally spaced ∅ = 5mm (inside) 15.5cm @ 433MHz A0 A1 A2 A3 A4 A5 A6 A7 VSS D8 D9 D10 D11 DIN OSC2 OSC1 VT VDD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 18 HT12D +5V 15 ROSC DATA OUT 1 DATA OUT 2 DATA OUT 3 DATA OUT 4 17 1K5 Ω Ω Quasar R 5 1 2 3 4 5 6 7 +5V ANTENNA |
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