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1.3
Equipment Ventilation
The repeater is equipped with a cooling fan that is used to provide forced convection cooling. When
planning the installation, observe the following ventilation guidelines:
•
Customer-supplied cabinets must be equipped with ventilation slots or openings in the front (for
air entry) and back or side panels (for air to exit). If several repeaters are installed in a single
cabinet, ensure ventilation openings surrounding each repeater allow for adequate cooling.
•
All cabinets must have a least 15 cm (6 inches) of open space between the air vents and any
wall or other objects.
•
When multiple cabinets (each equipped with several repeaters) are installed in an enclosed
area, ensure appropriate ventilation and consider air conditioning or other climate control equip-
ment to satisfy the temperature requirements stated under Section 1.2.1 Operating Temperature
Range on page 8.
1.4
AC Input Power Requirements
The repeater is equipped with a switching power supply, and this assembly operates from 100 –
240 VAC at 47 – 63 Hz AC input power. A standard 3-prong line cord is supplied to connect the
power supply to the AC source.
The outlet must be connected to an AC source capable of supplying a maximum of 280 W. For
a nominal 110/120 VAC input, the AC source must supply 5 A and should be protected by circuit
breaker rated at 15 A. For a nominal 220/240 VAC input, the AC source must supply 3 A and should
be protected by a circuit breaker rated at 10 A.
1.4.1
Circuit Overloading
Consideration should be given to the effects of overloading on overcurrent protection devices and
supply wiring. Appropriate consideration of equipment ratings should be used when addressing
this concern.
1.5
Equipment Mounting Methods
The
X-R70 Repeater may be mounted in a rack, bracket or cabinet (available as accessories).
1.6
Site Grounding and Lightning Protection
One of the most important considerations when designing a communications site is the ground and
lightning protection system. While proper grounding techniques and lightning protection are closely
related, the general category of site grounding may be divided into the following section.
1.6.1
Electrical Ground
Ground wires carrying electrical current from circuitry or equipment at the site is included in the cat-
egory of electrical ground. Examples include the AC or DC electrical power used to source equip-
ment located at the site, and wires or cables connected to alarms or sensors located at the site.
1.6.2
RF Ground
This type of ground is related to the bypassing of unwanted radio frequency energy to earth ground.
An example of RF grounding is the use of shielding to prevent or at least minimize the leakage of
unwanted RF energy from communications equipment and cables.
It is recommended that a standard 3-wire grounded electrical outlet be used
as the AC source.
Proper site grounding and lightning protection are vitally important consider-
ations. Failure to provide proper lightning protection may result in permanent
damage to the radio equipment.
Chapter 1 Pre-Installation Considerations
Page 9
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