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Dali Matrix PS System Installation and Commissioning Guide
Dali Wireless Proprietary and Confidential | DW-MAN-036 Rev 06
RF Exposure
According to FCC Part 1.1307(b)(1), systems operating under the provisions of this section shall
be operated in a manner that ensure that the public is not exposed to radio frequency energy
level in excess of the Commission’s guidelines. More information on evaluating compliance with
these limits can be found in the FCC's OST/OET Bulletin Number 65,
“Evaluating Compliance
with FCC-Specified Guidelines for Human Exposure to Radiofrequency Radiation
”.
All maximum Conducted Output Power + Max Antenna Gain (dBi) shown below is less than the
37dBm ERP limit. In real deployment, there will be distribution loss due to cable and splitter
combiners between the output of device and antenna to ensure radiated power is under 37 dBm
ERP limit.
RF Exposure Evaluation Distance Calculation
𝑑 = √ (𝐸𝐼𝑅𝑃/4𝜋𝑆)
Where:
d = Distance to the center of radiation of the antenna (cm) for the allowable Power Density
S = Allowable Power Density Limit (mW/cm2)
EIRP = Equivalent isotropically radiated power (mW ) = 10
[TX Power (dBm) + Ant Gain (dBi)/10]
airHost33 PS Dual B and
150 MHz Band, Mode B (5 W)
In the Frequency Range of 30 to 300 MHz, the maximum power density limit for the
occupational/controlled exposures is 1 mW/cm2 for an average time of 6 minutes. In the
Frequency Range of 30 to 300 MHz, the maximum power density limit for the general
population/uncontrolled exposures is 0.2 mW/cm2 for an average time of 30 minutes.
The antenna connected to the product is specific to the deployment. The worst case scenario occurs
when using a high gain antenna. A typical outdoor antenna is shown in the following example:
The highest conducted output power is 37 dBm. To avoid exceeding 37 dBm ERP, the unit output
power can be backed off to 30 dBm. With a donor antenna gain of 7 dBi, the EIRP is 37 dBm.
The maximum power density safe exposure level for general population/uncontrolled exposure of
30 minutes for the frequency of 152 MHz is 0.2 mW/cm2.
Conducted Output
Power (dBm)
Max Antenna
Gain (dBi)
Max EIRP
(mW)
Power Density Limit
Allowed (mW/cm²)
Safe Distance
(cm)
