TransCore MPRX, System Manual

Page: 6 / 208

System Guide
TransCore Proprietary vi
RADIO FREQUENCY HEALTH LIMITS FOR MPRX READER
USING AN EXTERNAL ANTENNA IN FREQUENCY BAND
OF 902.25 TO 903.75 AND 910.00 TO 921.50 MHZ
Several agencies (OSHA, FCC, IC) have environmental guidelines regulating maximum permissible
exposure (MPE) or “safe” exposure levels that this product falls under. To ensure that proper safety
guideline for the end users of this product, i.e. Occupational (Controlled) and General Population/
Public (Uncontrolled), the recommended levels for each of the agencies are presented in the next
sections with TransCore’s recommendations for safety in the last section.
OSHA (Occupational Safety and Health Administration)
OSHA (an agency of The United States of America) legislates in the Code of Federal Regulations
(CFR) Title 29 Part 1910 Subpart G 1910.97 titled “Nonionizing radiation”, a maximum safe exposure
limit of 10 milliwatts per square centimeter (mW/cm
2
) during any 0.1-hour period (i.e. 6 minutes).
Using the frequency (in the middle of the band of operation of this equipment) of 915 MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum safe
distance was calculated to be 8in (20cm).
FCC (Federal Communication Commission)
FCC (an agency of The United States of America) legislates in the Code of Federal Regulations
(CFR) Title 47 Chapter I Subchapter A Part 1 Subpart I Section 1.1310 titled “Radiofrequency radiation
exposure limits” that the maximum permissible exposure (MPE) is the following:
Occupational/Controlled Exposure
Power density = frequency (in MHz)/300 mW/cm 2 with an Averaging time of 6 Min
General Population/Uncontrolled Exposure
Power density = frequency (in MHz)/1500 mW/cm
2
with an Averaging time of 30 Min
Using the frequency (in the middle of the band of operation of this equipment) of 915MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum
safe distance was calculated. The MPE minimum distances are 14in (36cm) for the Occupational/
Controlled environment, and 31.5in (80.5cm) for the General Population/Uncontrolled environment.
Industry Canada (Innovation, Science and Economic Development Canada)
Industry Canada (a Department of the Government of Canada) sets out the requirements in Radio
Standards Specification RSS-102, Issue 5 guidelines, recommending a maximum safe