Radiometrix Ltd

PLT/PLR Data Sheet

page 11

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 9: Antenna types (for 433MHz) band)

Ordering Information:

Part No.

Description

Frequency band (MHz)

Supply (V)

RF power (mW)

Data rate

VHF

PLT1-173-9

Transmitter

173.200 - 173.325

3.1 -15

10

9600bps

PLR1-173-9

Receiver

173.200 - 173.325

3.1 -15

9600bps

PLT1-151-9

Transmitter

150.825 - 152.450

4.1 -15

100

9600bps

PLR1-151-9

Receiver

150.825 - 152.450

3.1 -15

9600bps

UHF

9600bps

PLT2-433-9

Transmitter

433.875-434.650

3.1 -15

10

9600bps

PLR2-433-9

Receiver

433.875-434.650

3.1 -15

9600bps

PLT2-458-9

Transmitter

458.525 - 459.1

4.1 -15

100

9600bps

PLR2-458-9

Receiver

458.525 - 459.1

3.1 -15

9600bps

Notes:

1.

The standard products use a 9600 baud user interface speed. Slower versions are also available

(1200, 2400 and 4800 baud, with suffixes -1, -2, and -4). e.g.: PLT1-173-4 (for 4800 baud)

2.

PLT/PLR are available on number of other VHF and UHF frequencies. Other UHF band frequencies

are subject to SAW filter availability. e.g. 315, 419, 429, 448, 465MHz etc

.