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Yaesu FT-450D Manual

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Page 12 FT-450D OPERATION MANUAL
I
NSTALLATION
ABOUT COAXIAL CABLE
Use high-quality 50-Ohm coaxial cable for the lead-in to your FT-450D transceiver. All efforts at providing an
efficient antenna system will be wasted if poor quality, lossy coaxial cable is used. This transceiver utilizes
standard “M” (“PL-259”) type connector.
GROUNDING
The FT-450D transceiver, like any other HF communications apparatus, requires an effective ground system for
maximum electrical safety and best communications effectiveness. A good ground system can contribute to
station efficiency in a number of ways:
It can minimize the possibility of electrical shock to the operator.
It can minimize RF currents flowing on the shield of the coaxial cable and the chassis of the transceiver.
Such currents may lead to radiation, which can cause interference to home entertainment devices or
laboratory test equipment.
It can minimize the possibility of erratic transceiver/accessory operation caused by RF feedback and/or
improper current flow through logic devices.
An effective earth ground system may take several forms. For a more complete discussion, see an appropriate
RF engineering text. The information below is intended only as a guideline.
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 positioned 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 cable(s) 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).
Inside of 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 supplies, and data communications devices (TNCs, etc.) should be made directly to the
ground bus using a heavy, braided cable.
Do not make ground connections from one electrical device to an-
other, and thence to the ground bus. This so-called “Daisy-Chain”
grounding technique may nullify any attempt at effective radio fre-
quency grounding. See the drawing at the right for examples of proper
grounding techniques.
Inspect the ground system - inside the station as well as outside - on
a regular basis so as to ensure maximum performance and safety.
Besides following the above guidelines carefully, note that house-
hold or industrial gas lines must never be used in an attempt to
establish an electrical ground. Cold water pipes may, in some in-
stances, help in the grounding effort, but gas lines represent a sig-
nificant explosion hazard, and must never be used.
TYPICAL PL-259 INSTALLATION
Linear
Amplifi e r
TNC
Transceiver
Linear
Amplifi e r
TNC
Transceiver
"Daisy Chain"
PROPER GROUND CONNECTION
IMPROPER GROUND CONNECTION
1/16''
3/4''
1 1/8''
3/4''
Adapter
1/8' '
5/8''3/8''
20 mm
20 mm
30 mm
3 mm
10 mm
15 mm
2 mm
… 14 …


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