INSTALLATION NOTES

For amateur base station installations it is recommended that the clearance in front of the antenna 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 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 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 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 radiation 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 constant 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

ABOUT CEForward 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 transmitter being activated for long periods. (actual recommendation 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 assessed risk is even lower.

Versions of the IC-7700 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 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 programming of this radio, to comply with national licensing requirement.

• 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