System Components
3-11
• Interface-to-ISA reader logic board used to control RF module sources and
functions
The generated RF levels fall well below IEEE C95.1-1991 and international health
limits. The RF module transmits radio energy at a fixed frequency and is classified as
a low-power radio transmitter. Maximum peak RF power is 1W for each channel—
less than the power generated by many common radios, including ham radios and
citizen band radios.
A PLL crystal-controlled oscillator of the RF module makes degradation over time
unlikely. The PLL is resistant to temperature, humidity, and power fluctuations.
Transmitter failure does not result in the generation of more than the maximum
specified power output of 1 W.
Type Testing
The RF module has passed testing for type acceptance of FCC Part 90 as a location
and monitoring service transceiver and verification of FCC Part 15 as Class A
equipment, unintentional radiator. The end user will be required to obtain and
maintain site licenses.
RF Emissions
To confine the read/write coverage to a single lane, the RF module can be adjusted to
emit much less than the maximum 1 W. Depending on the particular installation site,
typical RF emission is an estimated 0.05 to 0.5 W. The RF module connects to an
automatic vehicle identification antenna that has a gain of approximately 10.5dB. This
gain produces energy levels and specific absorption rates far below IEEE C95.1-1991-
specified limits at any point around the antenna.
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