Bedienungsanleitung Icom IC-7400 (Seite 114 von 116) (Englisch)

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ABOUT CE

2001 NEW

INSTALLATION NOTES

For amateur base station installations it is recom-

mended that the forwards clearance in front of the an-

tenna array is calculated relative to the EIRP (Effective

Isotropic Radiated Power). The clearance height below

the antenna array can be determined in most cases

from the RF power at the antenna input terminals.

As different exposure limits have been recommended

for different frequencies, a relative table shows a

guideline for installation considerations.

Below 30 MHz, the recommended limits are speciﬁed

in terms of V/m or A/m ﬁelds as they are likely to fall

within the near-field region. Similarly, the antennae

may be physically short in terms of electrical length

and that the installation will require some antenna

matching device which can create local, high intensity

magnetic fields. Analysis of such MF installations is

best considered in association with published guidance

notes such as the FCC OET Bulletin 65 Edition 97-01

and its annexes relative to amateur transmitter instal-

lations. The EC recommended limits are almost identi-

cal to the FCC speciﬁed ‘uncontrolled’ limits and tables

exist that show pre-calculated safe distances for differ-

ent antenna types for different frequency bands. Fur-

ther information can be found at http://www.arrl.org/.

• Typical amateur radio installation

Exposure distance assumes that the predominant ra-

diation pattern is forwards and that radiation vertically

downwards is at unity gain (sidelobe suppression is

equal to main lobe gain). This is true of almost every

gain antenna today. Exposed persons are assumed to

be beneath the antenna array and have a typical

height to 1.8 m.

The ﬁgures assume the worst case emission of con-

stant carrier.

For the bands 10 MHz and higher the following power

density limits have been recommended:

10–144 MHz 2 W/sq m

EIRP clearance heights by frequency band

1 Watts 2.1 m

10 Watts 2.8 m

25 Watts 3.4 m

100 Watts 5 m

1000 Watts 12 m

Forward clearance, EIRP by frequency band

100 Watts 2 m

1000 Watts 6.5 m

10,000 Watts 20 m

100,000 Watts 65 m

In all cases any possible risk depends on the transmit-

ter being activated for long periods. (actual recom-

mendation limits are speciﬁed as an average during 6

minutes) Normally the transmitter is not active for long

periods of time. Some radio licenses will require that a

timer circuit automatically cuts the transmitter after 1–2

minutes etc.

Similarly some types of transmitter, SSB, CW, AM etc.

have a lower ‘average’ output power and the assessed

risk is even lower.

Versions of the IC-7400 which display the

“CE” symbol on the serial number seal,

comply with the essential requirements of

the European Radio and Telecommunication

Terminal Directive 1999/5/EC.

This warning symbol indicates that this

equipment operates in non-harmonised fre-

quency bands and/or may be subject to li-

censing conditions in the country of use. Be

sure to check that you have the correct ver-

sion of this radio or the correct programming

of this radio, to comply with national licens-

ing requirement.

IC-7400.qxd 02.4.2 11:36 Page 101

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