SYSTEM.
2.5.3
Communication Links
Transmission line between the transmitter and the antenna shall be 50 ohm
impedance, foam dielectric rated for the transmitter output power. Minimum
requirement shall be RG-8/U foam dielectric. For lengths in excess of 15 m
50 feet, transmission line shall be of the corrugated copper outer sheath
type with either foam or air dielectric.
2.6
RADIO SWITCH
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NOTE: Designer must show location of equipment to
be controlled.
The designer must show power wiring details, and
voltage for each type of radio switch installation.
Standard radio switch voltages are 24, 120, and
208-240 volts.
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A microprocessor based radio switch shall be provided to control equipment
as shown. Modulation technique shall be direct FM. The coding capacity
shall be at least 256 discrete addresses. The radio switch shall
incorporate a 15 minute plus or minus 20 percent timer and restore the
controlled service when the time out period has elapsed and another signal
is not received. The radio switch shall operate on the voltage source as
shown. Contact life of the relay shall be at least 100,000 operations at
the rated load. The radio switch shall incorporate a narrow band FM,
superheterodyne receiver that operates at a frequency of [136-174 MHz]
[_____]. The sensitivity shall be such that 20 microvolts per meter field
strength level shall cause relay operation. The radio switch shall contain
an internal antenna. Selectivity shall be at least 50 dB down from carrier
reference at plus or minus 25 KHz. Spurious and image rejection shall be
at least 40 dB. Frequency stability shall be plus or minus 0.002 percent
over the range specified in the paragraph Environmental Requirements.
2.7
CONDUIT
Conduit as specified in Section 16402 INTERIOR DISTRIBUTION SYSTEM and
Section 16375A ELECTRICAL DISTRIBUTION SYSTEM, UNDERGROUND and as shown
shall be furnished.
2.8
ENCLOSURES
Enclosures shall conform to the requirements of NEMA 250 for the types
specified. Finish color shall be the manufacturer's standard, unless
otherwise indicated. Damaged surfaces shall be repaired and refinished
using original type finish. Enclosures installed indoors may be Type 1
when located in a clean dry environment, and shall be Type 12 when
installed indoors in other than clean dry environment, or as shown.
Enclosures installed outdoors shall be Type 4 unless otherwise shown.
PART 3
EXECUTION
3.1
INSTALLATION
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SECTION 16790A
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