Radiometrix Ltd

TLC2H/RLC2H 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

Variants and ordering information

Part No.

Description

Frequency band

TLC2H-433-5

Transmitter

433.875-434.650MHz

RLC2H-433-5

Receiver

433.875-434.650MHz

Other variants can be supplied to individual customer requirements at frequencies from 433MHz to 435MHz and/or

optimised for specific data speeds and formats. Please consult the Sales Department for further information.

Figure 7: Antenna types