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ABOUT CE
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.
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 antenna may
be physically short in terms of electrical length and that
the installation will require some antenna matching de-
vice which can create local, high intensity magnetic
fields. Analysis of such MF installations is best consid-
ered in association with published guidance 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 an-
tenna types for different frequency bands. 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 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 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 have been recommended:
10–50 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 transmit-
ter 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 transmitter, SSB, CW, AM etc.
have a lower ‘average’ output power and the assessed
risk is even lower.
Versions of the IC-703 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 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 programming
of this radio, to comply with national licens-
ing requirement.
