Yaesu FT-100D Operating Manual page 13

Installation
GROUNDING
Base Station Earth Grounding
Typically, the ground connection consists of one or more copper-clad steel rods, driven
into the ground. If mUltiple ground rods are used, they should be configured in a "V"
configuration, and bonded together at the apex of the V which is nearest the station loca-
tion. Use a heavy, braided cable (such as the discarded shield from type RG-213 coaxial
cable) and strong cable clamps to secure the braided cables to the ground rods. Be sure to
weatherproof the connections to ensure many years of reliable service. Use the same type
of heavy, braided cable for the connections to the station ground bus (described below).
Do not use gas line pipes in an attempt to provide a ground connection! To do so creates
a serious risk of explosion!!
Inside the station, a common ground bus consisting of a copper pipe of at least 25 mm (1")
diameter should be used. An alternative station ground bus may consist of a wide copper
plate (single-sided circuit board material is ideal) secured to the bottom of the operating
desk. Grounding connections from individual devices such as transceivers, power sup-
plies, and data communications devices should be made directly to the ground bus using a
heavy, braided cable.
Do not make ground connections from one electrical device to another, and thence to the
ground bus. This so-called "Daisy Chain" grounding technique may nullify any attempt at
effective radio frequency grounding. See the drawings below for examples of proper and
improper ground connections. If your coaxial cable does not connect directly to the station
ground bus, you may connect a ground cable to the FT-J 00 using one ofthe mounting bolts
from the MMB-48 Mobile Bracket.
Improper Ground Connection Proper Ground Connection
Transceiver Linear
Amplifier
GND
Power
Supply
GND
Transceiver
Linear Power
Amplifier Supply
GND GND GND GND
\:=--===i-:::....====J-
FT-IOO
MICRO MOBILE OPERATING MANUAL
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