Appendix; Optional Accessories; Appendix 4.1 Optional Accessories; Transmission Range - Simrad RT62 Manual

RT62 & RT64

4 APPENDIX

4.1 Optional Accessories

The following accessories are available from your nearest
Simrad Technical Dealer. Please quote the correct part number
when ordering.
DSC1400
1 2 3
A L L S H I P S U R G E N C Y
DSC Controller (Class D)
F R O M : 1 2 3 4 5 6 7 8 9
R E S P : S I M P L E X C H 1 6 4 5 6
R E C ' D : 1 8 0 7 9 7 1 6 : 4 2
for use with RT64
7 8 9
C 0 E N T E R
THS-5
Spare telephone handset
FTM-5
Spare fistmike
LS60
Waterproof extension loudspeaker
FMB1000BK Flush Mount Kit
Suitable for RT62, RT64 and DSC1400
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4.2 Transmission Range

E04074 E04074
Because VHF signals travel in a straight line and are not reflect-
ed back off the ionosphere as lower frequency signals are, the
range of VHF signals is limited to 'line of sight', beyond which
the other vessel passes behind the curve of the Earth.
Therefore, the range will increase greatly the higher above sea
level the antenna is, as Fig 5.1 illustrates (assuming maximum
transmission power is used):
87 km / 65 M
30 m/
100 ft
Mast
20 km / 12 M
9 m/
30 ft
Mast
Fig 4.1 - VHF transmission range
Therefore, the typical ship to ship range of a fixed VHF radio
such as the RT62/RT64 with a masthead antenna will be
approximately 20 Km (12 miles). This will increase as height
above sea level increases, or if the other radio user's antenna is
at a greater height - note that the range between the yacht with
the antenna mounted on a 9 M (30 Ft) mast and the shore sta-
tion increases to 46-53 Km (29-33 Miles).
Instruction Manual
8 km / 5 M
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