Quick Reference Guide; I Installation; Grounding Your Shack; Installing Your Dc Power Supply - Icom IC-703 Instruction Manual

QUICK REFERENCE GUIDE

I 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.

1. Grounding your Shack

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 neighbours may experience
interference. 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-703 to your grounding
system, the shortest most direct connection is recom-
mended.
NOTE: There are many publications covering
proper grounding techniques. Check with your local
dealer for more information and recommendations.

2. Installing your DC Power Supply

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-703 is the PS-125. This
plug and play unit plugs into the DC power recepta-
cle using an optional OPC-1248 located on the rear
of the radio.
Or connect the supplied DC power cable (OPC-1229)
to the appropriate color coded terminals, then insert
the DC connector into the DC power receptacle lo-
cated 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.
I
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.
R WARNING!: NEVER
ment or antennas to house gas lines. NEVER at-
tach ground lines to plastic (pvc) pipe.
D D Some Symptoms if inadequate grounding
a. Poor DC Ground
50/60 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.
Ground
PS-125
DC power cable
Optional
OPC-1248
Connect to an AC outlet
using the supplied AC cable.
ground station equip-
Transceiver
AC
to DC
outlet
power A DC power
receptacle supply*
Black Red
_ +
*13.8 V;
at least 3.0 A
continuous
AC cable
Supplied
OPC-1229
4 A fuses