LMT2 datasheet(10/11 Pages) ETC2

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-GND

C. Whip antenna

16.4cm

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.

Ordering Information:

Part No.

Descript

Description

ion

Frequency band

(MHz)

RF power

(mW)

Channel spacing

(kHz)

Data rate

kbps

LMT2-433-5

Transmitter

433.875-434.650

LMR2-433-5

Receiver

433.875-434.650

LMT2-458-5

Transmitter

458.525 - 459.1

100

LMR2-458-5

Receiver

458.525 - 459.1

LMT2-433-5-12k5

Transmitter

433.875-434.650

12.5

LMR2-433-5-12k5

Receiver

433.875-434.650

12.5

LMT2-458-5-12k5

Transmitter

458.525 - 459.1

100

12.5

LMR2-458-5-12k5

Receiver

458.525 - 459.1

12.5

LMT2-433-10

Transmitter

433.875-434.650

LMR2-433-10

Receiver

433.875-434.650

LMT2-458-10

Transmitter

458.525 - 459.1

100

LMR2-458-10

Receiver

458.525 - 459.1

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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