Manual Icom IC-78 (page 10 of 48) (English)

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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 ≈

⁄8 in 10 mm ≈

⁄8 in 1–2 mm ≈

⁄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.

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Icom IC-78 Manual

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