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Installing the Control Unit
Radio transmitters (AM or FM), television stations, induction heaters, motors
(with commutators) of 0.25 horsepower (200 watts) or greater, and similar
equipment are leading causes of interference. Small tools with universal
motors are generally not a problem when they operate on separate power
lines. Motors without commutators generally do not cause interference.
Field strengths below 1.0 volt per meter are unlikely to cause interference.
The field strength produced by radio transmitters can be estimated by
dividing the square root of the emitted power in kilowatts by the distance from
the antenna in kilometers. This yields the approximate field strength in volts
per meter and is relatively accurate for distances greater than about half a
wavelength (492 ft, or 150 m, for a frequency of 1000 Hz). See the Customer
Support Information in the beginning of this guide for FCC Part 15 radio
frequency regulations.
Control Unit Requirements
■ Dimensions
— Basic carrier: 14” W x 23” H x 12” D
— Basic carrier and one expansion carrier:
25” W x 23” H x 12” D
— Basic carrier and two expansion carriers:
37” W x 23” H x 12” D
■ Location
— Within 5 ft
controlled
(152 cm) of AC power outlet that is not switch-
— Within 25 ft (762 cm) of the network interface—or use an off-
premises range extender (OPRE)
— Within 1000 cable feet (305 m) of telephones— or use an OPRE
(for basic telephones)
2-4
Preparation