LMT1-173-5 Просмотр технического описания (PDF) - Radiometrix Ltd
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LMT1-173-5 Datasheet PDF : 10 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.
410mm @ 173MHz
Whip antenna
R
wire, rod, PCB track
F
or a combination of these
length(mm) = 71250 / freq(MHz)
Helical antenna
35-40 turns wire spring
R
F
length 120mm, dia 10mm
trim wire length or expand coil for
best results
Ctune
Loop antenna
RF
C match
track width = 1mm
min. area 500mm2
capacitors may be variable or fixed
(values depend on loop dimensions)
RF GND
Figure 7: Antenna types
Ordering Information:
Part No.
LMT1-173-5
LMR1-173-5
LMT1-151-5
LMR1-151-5
Description
Transmitter
Receiver
Transmitter
Receiver
Frequency band
(MHz)
173.225 - 173.325
173.225 - 173.325
150.825 - 152.450
150.825 - 152.450
RF power
(mW)
10
100
Channel spacing
(kHz)
25
25
25
25
Data rate
kbps
5
5
5
5
LMT1-173-5-12k5 Transmitter 173.225 - 173.325 10
12.5
5
LMR1-173-5-12k5 Receiver
173.225 - 173.325
12.5
5
LMT1-151-5-12k5 Transmitter 150.825 - 152.450 100
12.5
5
LMR1-151-5-12k5 Receiver
150.825 - 152.450
12.5
5
LMT1-173-10
Transmitter 173.225 - 173.325 10
25
10
LMR1-173-10
Receiver
173.225 - 173.325
25
10
LMT1-xxx-5
Where xxx is any 2MHz band
10/100
25
5
LMR1-xxx-5
from 130MHz to-180MHz
25
5
Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 9
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