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FM-RX2-433F-3V データシート(PDF) 7 Page - rfsolutions.ltd |
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FM-RX2-433F-3V データシート(HTML) 7 Page - rfsolutions.ltd |
7 / 9 page DS000022 Rev D July ‘99 ©1999 REG No 277 4001, ENGLAND. Page 7 FM TRANSMITTER & RECEIVER FM-TX2-XXX MODULES. (2ND GENERATION) FM-RX2-XXX Antenna requirements Three types of integral antenna are recommended and approved for use with the module: Helical Wire coil, connected directly to pin 2, 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. Loop A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from pin 2 at a point 20% from the ground end. Loops have high immunity to proximity de-tuning. Whip This is a wire, rod, PCB track or combination connected directly to pin 2 of the module. Optimum total length is 17cm (1/4 wave @ 418MHz) 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 helical loop whip Ultimate performance ** * *** Easy of design set-up ** * *** Size *** ** * Immunity proximity effects ** *** * Range open ground to similar antenna (for TX2-433-A & RX2-433-A) 200m 100m 300m The antenna choice and position directly controls the system range. Keep it clear of other metal in the system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal antenna must be used try to keep it away from other metal components, particularly large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the antenna itself. A An ntteen nn na a sseelleeccttiioon n cch ha arrtt F Fiigg..88:: a an ntteen nn na a ccoon nffiiggu urra attiioon nss |
同様の部品番号 - FM-RX2-433F-3V |
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同様の説明 - FM-RX2-433F-3V |
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