Module mounting considerations
The modules may be mounted horizontally or vertically on an area of ground plane preferably close to
the antenna to minimise feed length. The receiver and it’s antenna should be kept away from sources of
interference (micro’s, SMPS etc.). The modules may be potted if required in a viscous compound which
can not enter the screen can..
Warning: Do NOT wash the modules. They are not hermetically sealed.
Fig. 7: module mounting options
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
A. Helical antenna
Feed point 15% to 25% of total loop length
track width = 1mm
RF-GND
4 to 10 cm2 inside area
C2
C1
RF
C3
C4
B. Loop antenna
16.4cm
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 16.4 cm total from RF pin.
C. Whip antenna
Fig.8: Antenna
A
helical
**
**
***
B
loop
C
whip
***
***
*
Ultimate performance
Easy of design set-up
Size
*
*
**
Immunity proximity effects
Range open ground to similar antenna
(for TX2-433-14-5V & RX2-433-14-5V)
**
200m
***
100m
*
300m
Antenna selection chart
Radiometrix Ltd., TX2 & RX2 Data Sheet
page 7
RADIOMETRIX [ RADIOMETRIX LTD ]
