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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likelyto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
229


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