Installation Notes; Index - Icom IC-718 Basic Manual

INSTALLATION NOTES

For amateur base station installations, it is recommended
that the forwards clearance in front of the antenna 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 10 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, antennae may be physically
short in terms of electrical length and the installation
will require some antenna matching device which can
create 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
installations. Further information can be found at http://www.
arrl.org/
• Typical amateur radio installation
Exposure distance assumes that the predominant radiation
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 constant
carrier.
For the bands 10 MHz and higher the following power
density limits are recommended :
10–30 MHz 2 W/sq m
Watts (EIRP)/ Clearance heights
1 2.1 (m)
10 2.8
25 3.4
100 5
1000 12
Watts (EIRP)/ Forward clearance
100 2 (m)
1,000 6.5
10,000 20
100,000 65
In all cases any possible risk depends on the transmitter
being activated for long periods. (actual recommendation
limits are specified as an average of 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 perceived risk is
even lower.
Number
1 Hz/10 Hz tuning steps ..... 4
A
Accessories ......................... i
Attenuator ......................... 11
Auto tuning step function .... 9
B
Band Edge Beep ................ 9
Band Stacking Register ...... 8
C
Connecting
Antenna .......................... 5
DC power supply ............ 6
Vehicle's battery ............. 6
Connector ........................... 3
D
DC power supply ................ 6
Desktop stand..................... 5
Dial Lock function ............... 9
Display ................................ 4
F
FCC information .................iii
Filter
Expanded ..................... 14
IF filter .......................... 13
Notch Filter ................... 15
Optional ........................ 13
Fine tuning step .................. 9
Frequency
Directly entering ............. 9
Using the Main Dial ........ 9
G
Grounding ........................... 5
I
IF shift function ................. 12
IMPORTANT ........................ i
Indicators
Function ......................... 4
Lock ............................... 4
Tune ............................... 4
Initial Set mode ................. 18
K
Keypad ............................... 2
L
LOCK .................................. 1
M
Memory channel ............... 17
Selecting ...................... 17
Transferring to VFO ..... 17
Writing .......................... 17
Memory scan .................... 17
Meter ................................ 10
Meter peak hold ................ 11
Microphone compressor ... 16
Mode select ...................... 20

INDEX

N
Noise Blanker ................... 11
Noise Reduction ............... 15
Notch Filter ....................... 15
O
Operating band ................... 8
Operating mode .................. 8
Options ............................. 23
P
Panel
Display ........................... 4
Front ............................... 1
Rear ............................... 3
Power
First applying .................. 7
ON or OFF ..................... 7
Preamplifiers..................... 11
PRECAUTIONS ................... i
Q
Quick Set mode ................ 18
Quick tuning step ................ 9
R
Resetting ............................ 7
RF gain ............................. 10
RIT function ...................... 11
S
Set mode .......................... 18
Specifications ................... 22
Split frequency operation .. 15
SQL level .......................... 10
Squelch............................. 10
T
Transmit output power ...... 10
V
VFO mode .......................... 8
Volume level ....................... 7
VOX function .................... 16
25