Bedienungsanleitung Icom IC-746PRO (Seite 4 von 116) (Englisch)

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QUICK REFERENCE GUIDE

2001 NEW

■ Installation

1. Install a ground system for DC noise suppression

and RFI suppression

2. Install your DC power supply

3. Install lightning protection. This will help protect

more than your gear.

4. Install and connect an antenna system for the ap-

propriate bands of operation

5. Connect other peripheral equipment. This includes

microphones, headsets, TNC, amplifiers and any

other equipment necessary to make your shack

complete.

Although your radio will operate by connecting the DC

power supply and antenna, it is necessary to have a

good ground system in your shack. A ground connec-

tion is the electrical contact between the common point

of an electrical or electronic system and the earth.

A good earth ground is necessary to prevent electrical

shock, eliminate problems from RFI and DC noise.

With more electronic devices being used today, it is

also important to reduce RFI and EMI. Although you

may not see interference in your shack, without a

grounding system, your neighbors may experience in-

terference. Even though many of these devices are

Part 15, where they must accept interference from

their surrounding environment, it is best to eliminate

as much of the possible interference from your shack.

If you do not have a grounding system for your shack,

depending on the location of your shack, basement or

ground ﬂoor, a good ground system can be as simple

as a couple of ground rods driven 6 to 8 feet into the

soil. When installing your IC-746PRO to your ground-

ing system, the shortest most direct connection is rec-

ommended.

NOTE: There are many publications covering

proper grounding techniques. Check with your local

dealer for more information and recommendations.

R WARNING!: NEVER ground station equip-

ment or antennas to house gas lines. NEVER at-

tach ground lines to plastic (pvc) pipe.

Some Symptoms if inadequate grounding

a. Poor DC Ground

60 Hz hum on the audio either Rx or Tx without the

antenna connected.

If you feel a tingling sensation when you touch a

metal surface. Surfaces such as the cover of your

radio or power supply.

b. Poor RF Ground

While transmitting and you feel a tingling sensation

when you touch a metal surface. Surfaces such as

the cover of your radio or power supply.

While transmitting, you experience interference to

other electronic devices, such as the telephone,

television or stereo audio systems.

The DC power supply is a device used to convert

110/220 V AC, also know as Household current, to a

steady source of 13.8 V DC.

The perfect match to your IC-746PRO is the PS-125.

This compact switching power supply is the matching

power supply for your IC-746PRO with a current rat-

ing of 25 A continuous duty. This plug and play unit

plugs into the DC jack located on the rear of the radio.

• If you are not using the PS-125:

Connect the supplied DC power cable (OPC-025D) to

the appropriate color coded terminals, then insert the

DC connector into the DC jack located on the rear of

the radio.

NOTE: Although the power supply current require-

ment is quite low during receiving, this not the case

when you transmit. With many electrical devices in

the shack, it is very important to verify the electrical

circuit is not overloaded.

30 A fuses

AC cable

Transceiver

outlet

A DC power

supply*

*13.8 V; at least 23 A

continuous

Black

Red

to DC power

socket

Supplied

DC power cable

PS-125

DC power

socket

Transceiver

DC power cable

Connect to an AC outlet using the supplied AC cable.

1. Grounding your Shack

2. Installing your DC Power Supply

IC-746PRO.qxd 02.4.2 11:30 Page I

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