User Manual

Table Of Contents
RF-Orchestra!™ Transmitter Installation and Operation Preinstallation
July 2000 6880493G02-C 3-7
Grounding Requirements
The RF-O! paging station site must meet certain specifications for adequate protection from
lightning induced transients.
Proper ground installation methods are outlined in the Motorola Quality Standards-Fixed
Network Equipment (FNE) Installation Manual (R56) - Motorola part number 6881089E50.
Ground Rings
Separate ground rings should surround the site building and antenna tower. Eight-foot long
ground rods should be driven into the ground at 10-foot intervals for average soil. The two
ground rings should be bonded together with one wire and buried at least 18 inches
underground, or below frost level.
These ground rings are referred to as the exterior primary ground and must be at least
#2 AWG tinned copper wire, solid or stranded. All connections to the rings should be made by
exothermic welding. All exothermic welded connections should be treated with cold
galvanizing spray.
Inspection wells should be provided for access to the buried ground system to allow
verification of ground resistance. The ground resistance should be less than 5 ohms.
Tower Grounding
Ground each leg of the antenna tower with an eight-foot ground rod driven near each leg. All
ground connections to the antenna must be exothermically welded. Do not weld directly on
tower structural members, only on provided tower grounding tabs or on the tower feet.
Note: Ensure that welding ground connections to the antenna tower does not void the warranty of
the tower.
CAUTION
Proper site grounding and lightning protection are vitally important considerations.
Failure to provide proper protection for either causes may result in catastrophic
damage to the station.