Radiometrix Ltd

BHX2 Data Sheet

page 5

Received Signal Strength

0.5

0.7

0.9

1.1

1.3

1.5

1.7

1.9

2.1

2.3

2.5

-130

-120

-110

-100

-90

-80

-70

-60

-50

-40

RF Level (dBm)

Figure 5: RSSI voltage variation with respect to RF level at BHX2

If the microcontroller has a built-in Analogue to Digital Converter (ADC), the Received Signal

Strength Indicator (RSSI) output voltage level can be read by the microcontroller to estimate its

distance from transmitting BHX2 unit or identify areas of weak signal reception.

RSSI can also be used to make a decision to switch to the second antenna in fixed installations

within building where the probability of null-spots are higher.