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LMR2-458-10 Datasheet(PDF) 10 Page - Radiometrix Ltd |
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LMR2-458-10 Datasheet(HTML) 10 Page - Radiometrix Ltd |
10 / 11 page Radiometrix Ltd LMT2/LMR2 Data Sheet page 10 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. Helical antenna B. Loop antenna RF C1 C2 C4 C3 RF-GND C. Whip antenna 16.4cm RF 0.5 mm enameled copper wire close wound on 3.2 mm diameter former 433 MHz = 24 turns Feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area wire, rod, PCB-track or a combination of these three 433 MHz = 16.4 cm total from RF pin. 2 RF Ordering Information: Ordering Information: Ordering Information: Ordering Information: Part No. Part No. Part No. Part No. Descript Descript Descript Description ion ion ion Frequency band Frequency band Frequency band Frequency band (MHz) (MHz) (MHz) (MHz) RF power RF power RF power RF power (mW) (mW) (mW) (mW) Channel spacing Channel spacing Channel spacing Channel spacing (kHz) (kHz) (kHz) (kHz) Data rate Data rate Data rate Data rate kbps kbps kbps kbps LMT2-433-5 Transmitter 433.875-434.650 10 25 5 LMR2-433-5 Receiver 433.875-434.650 25 5 LMT2-458-5 Transmitter 458.525 - 459.1 100 25 5 LMR2-458-5 Receiver 458.525 - 459.1 25 5 LMT2-433-5-12k5 Transmitter 433.875-434.650 10 12.5 5 LMR2-433-5-12k5 Receiver 433.875-434.650 12.5 5 LMT2-458-5-12k5 Transmitter 458.525 - 459.1 100 12.5 5 LMR2-458-5-12k5 Receiver 458.525 - 459.1 12.5 5 LMT2-433-10 Transmitter 433.875-434.650 10 25 10 LMR2-433-10 Receiver 433.875-434.650 25 10 LMT2-458-10 Transmitter 458.525 - 459.1 100 25 10 LMR2-458-10 Receiver 458.525 - 459.1 25 10 Note: Also available on the other UHF band frequencies subject to SAW filter availability. e.g. 315, 419, 429, 448, 465MHz etc. Figure 7: Antenna types |
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