MSR3 RADIOMETRIX [Radiometrix Ltd], MSR3 Datasheet - Page 4

• Manufacturer Part Number: MSR3
• Description: NBFM Multi-channel receiver for 868MHz SRD band
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

Figure 4: RSSI voltage variation with respect to RF level at MSR3
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 MSR3 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.
Radiometrix Ltd, MSR3 Data Sheet
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
Received Signal Strength Indicator
-130
-120
-110
-100
RF Level (dBm)
-90
-80
-70
-60
-50
-40
page 4