Bedienungsanleitung Icom IC-718 (Seite 62 von 64) (Englisch)

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INSTALLATION NOTES

For amateur base station installations, it is

recommended that the forwards 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.

As different exposure limits have been recommended

for different frequencies, a relative table shows a

guideline for installation considerations.

Below 10 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, at antennae may

be physically short in terms of electrical length and that

the installation will require some antenna matching de-

vice which can create 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 installations. Further in-

formation 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 suppresion 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 are recommended :

10–30 MHz 2 W/sq m

Watts (EIRP)/ Clearance heights

1 2.1 (m)

10 2.8

25 3.4

100 5

1000 12

Watts (EIRP)/ Forward clearance

100 2 (m)

1,000 6.5

10,000 20

100,000 65

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 of 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 perceived

risk is even lower.

Versions of the IC-718 which display the “CE”

symbol on the serial number seal, comply with

the essential requirements of the European

Radio and Telecommunication Terminal Direc-

tive 1999/5/EC.

This warning symbol indicates that this equip-

ment operates in non-harmonised frequency

bands and/or may be subject to licensing con-

ditions 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 com-

ply with national licensing requirement.

IC-718.qxd 02.9.6 14:30 Page 60

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