Page 18
Table 4
Coax cable signal losses
Typical cable losses for two common types of coaxial cable.
Cable type
Cable loss per meter for VHF channels
RG 58
2.0 dB/10 meter cable
RG 214
0.8 dB/10 meter cable
Line of sight
As a general rule the VHF communication range is the same as the line of sight
distance, which means that the receiver antenna must be able to see the transmitter
antenna. Line of sight depends on eye height above water level of the transmitter and
of the receiver. As the “eye” of the radio is the antenna, the communication range
depends on the height above water level of the antennas.
The illustration shows the line of sight (the curvature of the Earth is exaggerated for
clarity).
Table 5
Line of sight distances
h
2
(m)
0.5
1
3
5
10
30
0.5
3.1
3.8
5.4
6.6
8.6
13.8
1
3.8
4.5
6.1
7.2
9.3
14.4
3
5.4
6.1
7.7
8.8
10.9
16.1
5
6.6
7.2
8.8
10.0
12.0
17.2
10
8.6
9.2
10.9
12.0
14.1
19.3
h
1
(m)
30
13.8
14.4
16.1
17.2
19.3
24.4
h
1
and h
2
are the heights above sea level of the transmit and receive antennas.
Distances are in nautical miles.
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Страница 15: ...Page 9 Drilling guides Table top bracket drilling guide ...
Страница 29: ...Page 23 Declaration of Conformity The Declaration of Conformity is provided as a separate document ...
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