Yaesu FT DX 1200, Operation Manual

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Page 9
F T
DX
1200 O
PERATING
M
ANUAL
I
NSTALLATION AND
I
NTERCONNECTIONS
P
ROPER
G
ROUND
C
ONNECTION
GND
Transceiver
GND
Linear
Amplifier
GND
TNC
"Daisy Chain"
GND
Linear
Amplifier
GND
TNC
GND
Transceiver
I
MPROPER
G
ROUND
C
ONNECTION
G
ROUNDING
The FT
DX
1200 transceiver, like any other HF communications apparatus, re T uires an effective ground system for maxi-
mum electrical safety and best communications effectiveness. $ good ground system can contribute to station ef ¿ ciency
in a number of ways
ˆ It can minimi ] e the possibility of electrical shock to the operator.
ˆ
It can minimi ] e 5 F currents À owing on the shield of the coaxial cable and the chassis of the transceiver. such cur-
rents may lead to radiation, which can cause interference to home entertainment devices or laboratory test e T uip-
ment.
ˆ It can minimi ] e the possibility of erratic transceiver accessory operation caused by 5 F feedback and or improper
current À ow through logic devices.
$ n effective earth ground system may take several forms. for a more complete discussion, see an appropriate 5 F engi-
neering 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” con
¿ guration and bonded together at the base of the “V” which
is nearest the station location. Use a heavy, braided cable such as the discarded shield from type 5 G- 13 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 the station, a common ground bus consisting of a copper pipe of at least mm diameter should be used. $ n al-
ternative 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 transceivers, power supplies, and data com-
munications devices
T 1 Cs, etc.) should be made directly to the ground bus using a heavy, braided cable.
' o not “ ' aisy-Chain” ground connections from one electrical device to another and thence to the ground bus. This
method may nullify any attempt at effective radio fre T uency grounding. See the drawing below for examples of proper
grounding techni T ues.
Inspect the ground system - inside the station as well as outside - on a regular basis to ensure continued performance
and safety.
Besides following the above guidelines carefully, note that household or industrial gas lines must never be used in an
attempt to establish an electrical ground. Cold water pipes may, in some instances, help in the grounding effort, but gas
lines represent a signi
¿ cant explosion ha ] ard, and must never be used.