Icom IC-78 Instruction Manual - Page 10

Installation And Connections

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3 INSTALLATION AND CONNECTIONS s Unpacking After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons. For a description and a diagram of accessory equipment included with the IC-78, see 'Supplied accessories' on p. 1 of this manual. s Selecting a location Select a location for the transceiver that allows adequate air circulation, free from extreme heat, cold, or vibrations, and away from TV sets, TV antenna elements, radios and other electro-magnetic sources. The base of the transceiver has an adjustable stand for desktop use. Set the stand to one of two angles depending on your operating conditions. s Grounding To prevent electrical shock, television interference (TVI), broadcast interference (BCI) and other problems, ground the transceiver through the GROUND terminal on the rear panel. For best results, connect a heavy gauge wire or strap to a long earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible. s Antenna connection For radio communications, the antenna is of critical importance, along with output power and sensitivity. Select antenna(s), such as a well-matched 50 Ω antenna, and feed line. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) is recommended for your desired band. Of course, the transmission line should be a coaxial cable. CAUTION: Protect your transceiver from lightning by using a lightning arrestor. PL-259 CONNECTOR INSTALLATION EXAMPLE q Coupling ring w e 30 mm 10 mm (soft solder) Slide the coupling ring down. Strip the cable jacket and soft solder. 10 mm Soft solder 1-2 mm solder solder Strip the cable as shown at left. Soft solder the center conductor. Slide the connector body on and solder it. r Screw the coupling ring onto the connector body. 30 mm ≈ 9⁄8 in 10 mm ≈ 3⁄8 in 1-2 mm ≈ 1⁄16 in Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceiver's power drops to protect the final transistor. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-78 has an SWR meter to monitor the antenna SWR continuously. R WARNING: NEVER connect the [GND] terminal to a gas or electric pipe, since the connection could cause an explosion or electric shock. 8

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3
8
INSTALLATION AND CONNECTIONS
■
Antenna connection
For radio communications, the antenna is of critical impor-
tance, along with output power and sensitivity. Select an-
tenna(s), such as a well-matched 50
Ω
antenna, and feed
line. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR)
is recommended for your desired band. Of course, the trans-
mission line should be a coaxial cable.
CAUTION:
Protect your transceiver from lightning
by using a lightning arrestor.
■
Unpacking
After unpacking, immediately report any damage to the
delivering carrier or dealer. Keep the shipping cartons.
For a description and a diagram of accessory equip-
ment included with the IC-78, see ‘Supplied acces-
sories’ on p. 1 of this manual.
■
Selecting a location
Select a location for the transceiver that allows ade-
quate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna ele-
ments, radios and other electro-magnetic sources.
The base of the transceiver has an adjustable stand
for desktop use. Set the stand to one of two angles de-
pending on your operating conditions.
■
Grounding
To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other prob-
lems, ground the transceiver through the GROUND
terminal on the rear panel.
For best results, connect a heavy gauge wire or strap
to a long earth-sunk copper rod. Make the distance be-
tween the [GND] terminal and ground as short as pos-
sible.
R
WARNING: NEVER
connect the [GND]
terminal to a gas or electric pipe, since the connec-
tion could cause an explosion or electric shock.
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transis-
tor. In this case, an antenna tuner is useful to match
the transceiver and antenna. Low SWR allows full
power for transmitting even when using the antenna
tuner. The IC-78 has an SWR meter to monitor the
antenna SWR continuously.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm
≈
9
∕
8
in
10 mm
≈
3
∕
8
in
1–2 mm
≈
1
∕
16
in
30 mm
10 mm (soft solder)
10 mm
1–2 mm
solder solder
Soft
solder
Coupling ring
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Slide the connector
body on and solder it.
Screw the coupling
ring
onto
the
connector body.
Strip the cable as
shown at left. Soft sol-
der the center con-
ductor.
q
w
e
r