INSTALLATION NOTES
For amateur base station installations it is recom-
mended that the clearance in front of the antenna
array is calculated relative to the EIRP (Effective Iso-
tropic 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 guide-
line 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 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 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 con-
stant 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
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 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 types of emission, i.e., SSB, CW, AM
etc. have a lower ‘average’ output power and the as-
sessed risk is even lower.
Versions of the IC-7700 which display the
“CE” symbol on the serial number label,
comply with the essential requirements of
the Radio and Telecommunications Termi-
nal Equipment Directive, 1999/5/EC, and
the restriction of the use of certain hazard-
ous substances in electrical and electronic
equipment Directive, 2011/65/EU.
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 program-
ming of this radio, to comply with national
licensing requirement.
• List of Country codes (ISO 3166-1)
ABOUT CE
1 Austria
AT
2 Belgium
BE
3 Bulgaria
BG
4 Croatia
HR
5 Czech Republic
CZ
6 Cyprus
CY
7 Denmark
DK
8 Estonia
EE
9 Finland
FI
10 France
FR
11 Germany
DE
12 Greece
GR
13 Hungary
HU
14 Iceland
IS
15 Ireland
IE
16 Italy
IT
17 Latvia
LV
18 Liechtenstein
LI
19 Lithuania
LT
20 Luxembourg
LU
21 Malta
MT
22 Netherlands
NL
23 Norway
NO
24 Poland
PL
25 Portugal
PT
26 Romania
RO
27 Slovakia
SK
28 Slovenia
SI
29 Spain
ES
30 Sweden
SE
31 Switzerland
CH
32 Turkey
TR
33 United Kingdom GB
Country
Codes
Country
Codes
