Yaesu FT-847 handleiding
Handleiding
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8
FT-847 OPERATING MANUAL
GROUNDING
The provision of an effective ground system is impor-
tant in any successful communications station. A good
ground system can contribute to station efficiency in a
number of ways:
r It can minimize the possibility of electrical shock
to the operator.
r It can minimize RF currents flowing on the shield
of the coaxial cable and the chassis of the trans-
ceiver which may cause interference to nearby
home entertainment devices or laboratory test
equipment.
r It can minimize the possibility of erratic transceiver
operation caused by RF feedback or improper cur-
rent flow through logic devices.
An effective earth ground system may take several
forms; for a more complete discussion, see an appro-
priate RF engineering text. The information presented
below is intended only as a guideline.
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 config-
ured in a “V” configuration, and bonded together at
the apex of the V which is nearest the station location.
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 con-
sist of a wide copper plate (single-sided circuit board
material is ideal) secured to the bottom of the operat-
ing desk. Grounding connections from individual de-
vices such as transceivers, power supplies, 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 ground-
ing. See the drawings below for examples of proper
and improper ground connections.
Inspect the ground system − inside the station as well
as outside − on a regular basis so as to ensure maxi-
mum performance and safety.
Installation
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Productinformatie
| Merk | Yaesu |
| Model | FT-847 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 17150 MB |
