LMT2-458-10 Просмотр технического описания (PDF) - Radiometrix Ltd
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LMT2-458-10 Datasheet PDF : 11 Pages
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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
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
C2
C3 C4
B. Loop antenna
RF-GND
C1
Feed point 15% to 25% of total loop length
track width = 1mm
4 to 10 cm2 inside area
RF
16.4cm
C. Whip antenna
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 16.4 cm total from RF pin.
Figure 7: Antenna types
Ordering Information:
Part No.
LMT2-433-5
LMR2-433-5
LMT2-458-5
LMR2-458-5
Description
Transmitter
Receiver
Transmitter
Receiver
Frequency band
(MHz)
433.875-434.650
433.875-434.650
458.525 - 459.1
458.525 - 459.1
RF power
(mW)
10
100
Channel spacing
(kHz)
25
25
25
25
Data rate
kbps
5
5
5
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.
Radiometrix Ltd
LMT2/LMR2 Data Sheet
page 10
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