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201

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

2.1 m

2 m

2.8 m

2.7 m 2.5 m

2.3 m

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

1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17

Austria
Belgium
Bulgaria
Croatia
Czech Republic
Cyprus
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Iceland
Ireland
Italy
Latvia