RF exposure explained

FCC ID: NS999P2

RF Exposure Info

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FCCID_37880

May 12, 1999

Federal Communications Commission
7435 Oakland Mills Road
Columbia, MD 21046

ATTN: Applications Examining Division

RE: Microhard Systems, Inc., Certification Application;
FCCID: NS999P2

Gentlemen:

Please find the enclosed application for Certification of a Part 15
Frequency Hopping Spread Spectrum Transmitter module.

The Model MHX-900 Embedded Wireless Modem is designed to meet the
FCC definition of a SST module. These aspects include RF shielding,
buffered data input, power regulation (operates off existing +5
volts rail), unique antenna connector (12" length cable with SMC to
reverse gender TNC connectors provided with antenna), FCC testing
performed with module in stand-alone configuration and outside of
case, and properly labeled with FCCID and interference statement.

The MHX-900 does not have a data I/O connector attached to the
module, but rather a connection header. Although it contains a
modem module along with the radio module, it is up to the actual
finished product into which this device is embedded, to provide a
data connector. Therefore the MHX-900 is not considered to be a
Digital Device Peripheral.

The 0.23 meter safe distance limit for 1 mW/cm RF exposure, to be
referenced in the user manual page 27, was calculated from
FCC OET 65 Appendix B, Table 1B Guidlines for General
Population/Uncontrolled Exposure. This calculation was based on the
highest EIRP possible from the system, considering maximum power
and antenna gain. The formula used was:

S = (Po*G)/(4*pi*r^2)

Your consideration is much appreciated.

Sincerely,

Steven Dayhoff
Chief Engineer

Document Created: 2001-06-25 14:07:56
Document Modified: 2001-06-25 14:07:56

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