Motorola VSWR, Service Manual Supplement

Page: 15 / 44

Human exposure to radio frequency energy (PCS1900 only)
5th Feb 99 Service Manual Supplement: VSWR Monitor for M-Cell 6
68P02900W86-O
7
Maximum
permitted
exposure
ceilings
Within the frequency range, the maximum permitted exposure ceiling for uncontrolled
environments is a power density (mW/cm
2
) that equals f/1500, where f is the frequency
expressed in MHz, and measurements are averaged over a period of 30 minutes. The
maximum permitted exposure ceiling for controlled environments, also expressed in
mW/cm
2
, is f/300 where measurements are averaged over 6 minutes. Applying these
principles to the minimum and maximum frequencies for which this equipment is intended
to be used yields the following maximum permitted exposure levels:
Uncontrolled Environment Controlled Environment
1930MHz 1970MHz 1930MHz 1970MHz
Ceiling 1.287mW/cm
2
1.313mW/cm
2
6.433mW/cm
2
6.567mW/cm
2
If you plan to operate the equipment at more than one frequency, compliance should be
assured at the frequency which produces the lowest exposure ceiling (among the
frequencies at which operation will occur).
Licensees must be able to certify to the FCC that their facilities meet the above ceilings.
Some lower power PCS devices, 100 milliwatts or less, are excluded from demonstrating
compliance, but this equipment operates at power levels orders of magnitude higher, and
the exclusion is not applicable.
Whether a given installation meets the maximum permitted exposure ceilings depends, in
part, upon antenna type, antenna placement and the output power to which this
equipment is adjusted. The following example sets forth the distances from the antenna
to which access should be prevented in order to comply with the uncontrolled and
controlled environment exposure limits as set forth in the ANSI IEEE standards and
computed above.