Installation Notes; Typical Amateur Radio Installation; Eirp Clearance Heights By Frequency Band; Forward Clearance, Eirp By Frequency Band - Icom IC-706MKIIG Instruction Manual

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 antennae
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 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 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 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 – 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
1 2.1 m
10 2.8 m 2.7 m
25 3.4 m 3.3 m
100 5 m 4.7 m
1000 12 m 11.5 m
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan
23 cm 13cm and above
2 m 2 m 2 m
2.5 m 2.3 m
2.7 m 2.5 m
3.6 m 3.2 m
7.3 m 6.3 m

Forward clearance, EIRP by frequency band

Watts 10–2 m 70 cm
100 2 m
1000 6.5 m
10,000 20 m 18 m
100,000 65 m 60 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-706MKIIG 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-706MKIIG
#02, #12
(Europe)
< Intended Country of Use >
GER NED ITA
AUT BEL GRE
GBR LUX SWE
ESP DEN
IRL
FRA POR FIN
IC-706MKIIG
#03, #13
(France)
< Intended Country of Use >
GER NED ITA
AUT BEL GRE
GBR LUX SWE
IRL ESP DEN
FRA POR FIN
23 cm 13cm and above
2 m 1.1 m 0.7 m
6 m 3.5 m 3 m
11 m 7 m
35 m 29 m
IC-706MKIIG
#04 ,#14
(Spain)
< Intended Country of Use >
GER NED
AUT BEL
GBR LUX
IRL ESP
FRA POR
IC-706MKIIG
#10, #20
(Italy)
< Intended Country of Use >
GER NED
AUT BEL
GBR LUX
IRL ESP
FRA POR
Count on us!
A-6045H-1EU Printed in Japan
© 2001 Icom Inc.
ITA
GRE
SWE
DEN
FIN
ITA
GRE
SWE
DEN
FIN