Bedienungsanleitung Icom IC-9100 (Seite 210 von 212) (Englisch)

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INSTALLATION NOTES

For amateur base station installations it is recom-

mended that the forward 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 antennas

may be physically short in terms of electrical length

and that the installation will require some antenna

matching device which can create local, high inten-

sity magnetic ﬁelds. Analysis of such MF installations

is best considered in association with published guid-

ance notes such as the FCC OET Bulletin 65 Edition

97-01 and its annexes relative to amateur transmitter

installations.

The EC recommended limits are almost identical to

the FCC speciﬁed ‘uncontrolled’ limits and tables exist

that show pre-calculated safe distances for different

antenna types for different frequency bands. Further

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

• Typical amateur radio installation

Exposure distance assumes that the predominant ra-

diation pattern is forward 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 of 1.8 m.

The ﬁgures assume the worst case emission of a con-

stant carrier.

For the bands 10 MHz and higher the following power

density limits have been recommended:

10–400 MHz 2 W/sq m

435 MHz 2.2 W/sq m

EIRP clearance heights by frequency band

Watts 10–2 m 70 cm 23 cm

13 cm and above

1 2.1 m 2 m 2 m 2 m

10 2.8 m 2.7 m 2.5 m 2.3 m

25 3.4 m 3.3 m 2.7 m 2.5 m

100 5 m 4.7 m 3.6 m 3.2 m

1000 12 m 11.5 m 7.3 m 6.3 m

Forward clearance, EIRP by frequency band

Watts 10–2 m 70 cm 23 cm

13 cm and above

100 2 m 2 m 1.1 m 0.7 m

1,000 6.5 m 6 m 3.5 m 3 m

10,000 20 m 18 m 11 m 7 m

100,000 65 m 60 m 35 m 29 m

In all cases any possible risk depends on the trans-

mitter 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 off the transmitter after

1–2 minutes etc.

Similarly some modes of transmission, SSB, CW, AM

etc. have a lower ‘average’ output power and the as-

sessed risk is even lower.

Versions of the IC-9100 which display the

“CE” symbol on the serial number label,

comply with the essential requirements of

the European Radio and Telecommunica-

tion Terminal Directive 1999/5/EC.

This warning symbol indicates that this

equipment operates in non-harmonised

frequency bands and/or may be subject to

licensing conditions in the country of use.

Be sure to check that you have the correct

version of this radio or the correct program-

ming of this radio, to comply with national

licensing requirement.

• List of Country codes (ISO 3166-1)

Country Codes Country Codes

Austria

Belgium

Bulgaria

Croatia

Czech Republic

Cyprus

Denmark

Estonia

Finland

France

Germany

Greece

Hungary

Iceland

Ireland

Italy

Latvia

Liechtenstein

Lithuania

Luxembourg

Malta

Netherlands

Norway

Poland

Portugal

Romania

Slovakia

Slovenia

Spain

Sweden

Switzerland

Turkey

United Kingdom

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