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LMT2-433-5 Datasheet(PDF) 10 Page - Radiometrix Ltd

Part No. LMT2-433-5
Description  UHF Narrow Band FM Low Cost multi channel
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Maker  RADIOMETRIX [Radiometrix Ltd]
Homepage  http://www.radiometrix.com
Logo RADIOMETRIX - Radiometrix Ltd

LMT2-433-5 Datasheet(HTML) 10 Page - Radiometrix Ltd

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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
Figure 7: Antenna types
Ordering Information:
Part No.
Description
Frequency band
(MHz)
RF power
(mW)
Channel spacing
(kHz)
Data rate
(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.


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