Bedienungsanleitung Icom IC-7400 (Seite 5 von 116) (Englisch)

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3. Installing lightning protection

Although you may not live in an area with high occur-

rence for lightning storms, it is always wise to take

precautions for lightning or static discharges. Proper

lightning protection not only offers protection to the

ham gear, but the shack and most importantly the op-

erator.

NOTE: There are many publications covering

proper lightning protection, check with your local

dealer for more information and recommendations.

Whether your IC-7400 is your first radio or one of

many, one of your key elements in a great shack is

the antenna system. There are three connections on

the back of your IC-7400, two for HF and 6 m and one

for 2 m. If you are using one antenna for HF and 6 m,

for simplicity, connect the antenna coax to ANT1.

Your IC-7400 is equipped with an internal antenna

tuner (ATU) for operation on 160–6 m. This ATU is de-

signed to work with an unbalanced 50 Ω feedline. The

purpose of the internal antenna tuner is to match the

impedance of your antenna system to as close to a

50 Ω load as possible. This ATU will not operate with

a long wire or ladder line (450 Ω or other balanced

feedlines). An external ATU such as the AH-4 would

be necessary for this kind of operation.

PL-259 CONNECTOR INSTALLATION EXAMPLE

30 mm ≈

⁄8 in 10 mm ≈

⁄8 in 1–2 mm ≈

⁄16 in

R WARNING: Although a mag mount antenna

works great on a vehicle, DO NOT use the IC-7400

with this type of antenna.

CAUTION: Although your IC-7400 has protection

to drop down power with a high SWR, this does not

completely protect the transceiver from transmis-

sion without an antenna. Make sure you have an

antenna connected whenever you transmit with

your radio.

NOTE: There are many publications covering

proper antennas and their installation, check with

your local dealer for more information and recom-

mendations.

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.

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 tran-

sistors. In this case, an antenna tuner is useful to

match the transceiver and antenna. Low SWR al-

lows full power for transmitting even when using the

antenna tuner. The IC-7400 has an SWR meter to

monitor the antenna SWR continuously.

ANTENNA 1, 2

[Example]: ANT1 for 1.8–18 MHz bands

ANT2 for 21–50 MHz bands

144 MHz ANTENNA

Connect a VHF (60–144 MHz)

antenna; impedance: 50 Ω.

4. Installing your antenna system

IC-7400.qxd 02.4.2 11:35 Page II

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