Bedienungsanleitung Icom IC7850 (Seite 280 von 282) (Englisch)

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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.

Different exposure limits have been recommended for

different frequencies, a relative table shows a guide-

line 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 intensity

magnetic fields. Analysis of such 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 forward and that radiation vertically

downward 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 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 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 the transmitter after 1–

2 minutes etc.

Similarly some types of emission, i.e., SSB, CW, AM

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

sessed risk is even lower.

• List of Country codes (ISO 3166-1)

Country Codes Country Codes

1 Austria AT 18 Liechtenstein LI

2 Belgium BE 19 Lithuania LT

3 Bulgaria BG 20 Luxembourg LU

4 Croatia HR 21 Malta MT

5 Czech Republic CZ 22 Netherlands NL

6 Cyprus CY 23 Norway NO

7 Denmark DK 24 Poland PL

8 Estonia EE 25 Portugal PT

9 Finland FI 26 Romania RO

10 France FR 27 Slovakia SK

11 Germany DE 28 Slovenia SI

12 Greece GR 29 Spain ES

13 Hungary HU 30 Sweden SE

14 Iceland IS 31 Switzerland CH

15 Ireland IE 32 Turkey TR

16 Italy IT 33 United Kingdom GB

17 Latvia LV

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