WI.232FHSS-250-R Radiotronix, WI.232FHSS-250-R Datasheet - Page 34

• Manufacturer Part Number: WI.232FHSS-250-R
• Description: RF Modules & Development Tools 900MHz FHSS Low
• Manufacturer: Radiotronix

Specifications of WI.232FHSS-250-R

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: WI232FHSS-250-R

WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET
To calculate the link budget for a wireless link, simply add the transmit power, the antenna gains, and the
receiver sensitivity:
=
+
−
+
LB
Ptx
Gtxa
SENSrx
Grxa
For example, the link budget for a pair of Wi.232FHSS modules at the minimum data rate and using 2.2dBi
½ wave dipole antennas would be:
(25mW): +13dBm + 2.2dB – (-105dBm) + 2.2dB: 122.4dB
(250mW): +23.5dBm + 2.2dB – (-105dBm) + 2.2dB: 132.9dB
A link budget of 122.4 dB should easily yield a range of 1/2 mile or more outdoors. If the environment is
open and the antennas are 8 to 10 feet off of the ground, the range could be more than a mile. Indoors,
this link budget should yield a range of several hundred feet. Packet testing of the 250mW module at full
power has yielded results in excess of 3 miles at maximum data rate.
The balance of receive sensitivity and transmit power allows good performance indoors in the presence of
multi-path while keeping the overall operating current low This makes these modules suitable for primary
battery powered applications such as RFID and automated meter reading.
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