User's Manual

Simulcast Hardware Installation Antenna Requirements
• A surge protector, designed to protect equipment systems from surges at a 120/240 V
service and load center, must be placed on the power feed ahead of all individual load
center circuit breakers. This protector must be listed by an NRTL for the purpose intended.
• Selection of a surge protector is based on the susceptibility of the equipment
powered by the electrical service, with margin provided for locally generated
disturbances. See ANSI/IEEE C62.41 for more details.
• At least one 120 VAC, 15 A duplex convenience outlet equipped with ground fault
interrupter (GFI) protection must be provided in the electronic equipment compartment.
Table 2-2 lists the required wire gauges for various installations. The “loop length” refers to
the combined length of the -48 VDC (hot) lead and the DC return lead. For example, a cabinet
installation that needs 16 feet of wire to reach the power supply rack has a total loop length
of 32 feet. For a standard installation, the equipment cabinet is located adjacent to the power
supply rack with a cable loop length less than 10.6 m (35 ft.).
Wire used for the cabinet power connection to the breaker panel shall not be less than 6 AWG. Total
cable loop (from the power supply rack breakers to the STR 3000 cabinet) voltage drop shall not
exceed 500 mV for the cabling of the -48 VDC (hot) lead and the DC return leads.
Some sites may require larger sizes than those noted in Table 2-2 to meet local codes. When larger cable
is used to run from a power source, the cable shall be “tapped down” to a smaller size for connection
to the STR 3000 breaker panel. In accordance with local code requirements, a properly sized electrical
box mounted on top of the STR 3000 rack cabinet or commercial tap cover is the point where the cable
size transition should take place. The site planner will specify the details of the transition.
When a “tapped down” connection is used, the total voltage drop between the “tapped
down” section and the main loop should not exceed 500 mV.
The screws that connect the power cables to the power supply rack are not provided and must be
locally procured. Power supply rack breaker panel screw size is 3/8-16 x 3/4.
Table 2-2 Power Connection Wire Gauge
Loop Length
Wire Gauge
Maximum Outer Diameter
of Cable
15.3 m (50 ft.) or less
6AWG
10.2 mm (0.40 in.)
15.3to24.4m(50to80ft.)
4AWG
10.2 mm (0.40 in.)
24.4 to 36.6 m (80 to 120 ft.)
2AWG
10.2 mm (0.40 in.)
Antenna Requirements
All antenna feed line installations are to be made through a metal antenna entry plate that
is external to the site building. See the Standards and Guidelines for Communication Sites
(68P81089E50) for details on the requirements for antenna feed lines.
RF Antenna at the Co-Located Site
The RF antenna provides a link between the prime and remote sites without introducing overload,
desensitivity, and intermodulation at a co-located site. You may need to install a fixed attenuator to the
antenna feed line at the site. The values for these attenuators can vary from site to site.
68P81003Y71-O November 2002 2-11