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LMT1 Datasheet(PDF) 9 Page - Radiometrix Ltd

Part No. LMT1
Description  VHF Narrow Band FM Low Cost multi channel radio modules
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Maker  RADIOMETRIX [Radiometrix Ltd]
Homepage  http://www.radiometrix.com
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LMT1 Datasheet(HTML) 9 Page - Radiometrix Ltd

 
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Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 9
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.
Helical antenna
R
F
Loop antenna
RF GND
RF
C
tune
C
match
capacitors may be variable or fixed
(values depend on loop dimensions)
track width = 1mm
min. area 500mm
2
Whip antenna
410mm @ 173MHz
R
F
wire, rod, PCB track
or a combination of these
length(mm) = 71250 / freq(MHz)
trim wire length or expand coil for
best results
35-40 turns wire spring
length 120mm, dia 10mm
Figure 7: Antenna types
Ordering Information:
Part No.
Description
Channel Frequencies (MHz)
RF
power
(mW)
Channel
Spacing
(kHz)
Data
rate
kbps
LMT1-144-5
Transmitter
CH0:144.000 – CH31:144.775
100
25
5
LMR1-144-5
Receiver
LMT1-151-5
Transmitter
CH0:150.825 – CH31:151.600
100
25
5
LMR1-151-5
Receiver
LMT1-151-5-12k5-MURS
Transmitter
CH0:150.820, CH1:150.880,
CH2:151.940, CH3:154.570,
CH4:154.600
100
12.5
5
LMR1-151-5-12k5-MURS
Receiver
LMT1-156.525-PM
Transmitter
156.525MHz
100
25
2.6V
pk-pk
2.1kHz
LMT1-173-5
Transmitter
CH0:173.250 – CH3:173.325
CH4 – CH7:173.225
CH8 – CH31:173.325
10
25
5
LMR1-173-5
Receiver
LMT1-173-5-12k5-FCC
Transmitter
CH0:173.20375, CH1:173.210,
CH2:173.2375, CH3:173.2875,
CH4:173.3125, CH5:173.3375,
CH6:173.3625, CH7:173.39625
100
12.5
5
LMR1-173-5-12k5-FCC
Receiver
LMT1-xxx-5
Where xxx is any 2MHz band from 130MHz to-
180MHz
10/100
25
5
LMR1-xxx-5


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