Manual Icom IC-746 (page 72 of 90) (English)

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SETUP AND CONNECTIONS

12-5

Grounding

12-6

Antenna

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 t

a long earth-sunk copper rod. Make the distance be-

tween the GROUND terminal and ground as short as

possible.

v CAUTION: NEVER connect the [GND] terminal

to a gas or electrical pipe, since the connection

could cause an explosion or electric shock.

Select antenna(s), such as a well-matched 50 Ω an-

tenna, and feedline. The transmission line should be a

coaxial cable. 1.5:1 or better of Voltage Standing Wave

Ratio (VSWR) is recommended for your required band.

Of course, the transmission line should be a coaxial

cable.

When using 1 antenna, use the [ANT1] connector.

v CAUTION: Protect your transceiver from lighten-

ing by using a lightening arrestor.

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-

tors. 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-746 has a SWR meter to monitor the

antenna SWR continuously.

30 mm

10 mm (soft solder)

10 mm

1–2 mm

solder solder

Soft

solder

Coupling ring

➀➂

➃

➁

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.

(10 mm ≈

⁄8 in)

PL-259 CONNECTOR INSTALLATION EXAMPLE

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Icom IC-746 Manual

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