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RX1-152.500-10 Datasheet(PDF) 11 Page - Radiometrix Ltd |
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RX1-152.500-10 Datasheet(HTML) 11 Page - Radiometrix Ltd |
11 / 19 page Radiometrix Ltd., TX1 & RX1 Data Sheet page 11 Helical antenna R F Loop antenna RF GND RF C tune C match capacitors may be variable or fixed (values depend on loop dimensions) track width = 1mm min. area 500mm 2 Whip antenna 410mm @ 173MHz R F wire, rod, PCB track or a combination of these length(mm) = 71250 / freq(MHz) trim wire length or expand coil for best results 35-40 turns wire spring length 120mm, dia 10mm Fig.10: integral antenna configurations Integral antenna summary: whip helical loop Ultimate performance *** ** * Ease of design set-up *** ** * Size * *** ** Immunity to proximity effects ** * *** Tamper-proof integral antenna Where the RX1 is used in alarm applications it may sometimes be necessary to provide a warning if any attempt is made to remove or disable its antenna. A typical solution to this problem is as follows: Fig.11: Tamper-proof antenna arrangement In normal operation the output will have a resistance to ground of R1+R2. If the antenna is shorted to ground it will show R2 only, and if the antenna is cut it will be open-circuit. R1 and R2 may be any value over 1k Ω. All track lengths should be kept to a minimum and the output may need to be decoupled in some cases to avoid noise being injected into the antenna from the following circuitry. RX1 1 23 8 9 4 567 R2 1/4 wave hairpin loop antenna R1 1n to comparator circuit, etc. |
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