Bedienungsanleitung Icom IC-7700 (Seite 229 von 232) (Englisch)

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INSTALLATION NOTES

For amateur base station installations it is recom-

mended that the clearance in front of the antenna

array is calculated relative to the EIRP (Effective Iso-

tropic 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 downward

is at unity gain (side lobe 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 off 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.

VersionsoftheIC-7700whichdisplaythe

“CE” symbol on the serial number label,

comply with the essential requirements of

the Radio and Telecommunications Termi-

nal Equipment Directive, 1999/5/EC, and

the restriction of the use of certain hazard-

ous substances in electrical and electronic

equipment Directive, 2011/65/EU.

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 program-

ming of this radio, to comply with national

licensing requirement.

• List of Country codes (ISO 3166-1)

ABOUT CE

1 Austria AT

2 Belgium BE

3 Bulgaria BG

4 Croatia HR

5 Czech Republic CZ

6 Cyprus CY

7 Denmark DK

8 Estonia EE

9 Finland FI

10 France FR

11 Germany DE

12 Greece GR

13 Hungary HU

14 Iceland IS

15 Ireland IE

16 Italy IT

17 Latvia LV

18 Liechtenstein LI

19 Lithuania LT

20 Luxembourg LU

21 Malta MT

22 Netherlands NL

23 Norway NO

24 Poland PL

25 Portugal PT

26 Romania RO

27 Slovakia SK

28 Slovenia SI

29 Spain ES

30 Sweden SE

31 Switzerland CH

32 Turkey TR

33 United Kingdom GB

Country Codes Country Codes

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