Simrad RT64 Manual

4.2 Transmission Range
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):
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
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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
DSC Controller (Class D)
for use with RT64
THS-5
Spare telephone handset
FTM-5
Spare fistmike
LS60
Waterproof extension loudspeaker
FMB1000BK Flush Mount Kit
Suitable for RT62, RT64 and DSC1400
RT62 & RT64
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1
4
7
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2
5
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3
6
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ALL SHIPS URGENCY
FROM : 123456789
RESP : SIMPLEX CH 16
REC’D : 18 07 97 16:42
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,,,
,
,
30 m/
100 ft
Mast
9 m/
30 ft
Mast
87 km / 65 M
13-16 km
8-10 M
20 km / 12 M
8 km / 5 M
20-26 km / 12-16 M
46-53 km / 29-33 M
Fig 4.1 - VHF transmission range

Simrad RT64 Specifications

General

Brand	Simrad
Model	RT64
Category	Radio
Language	English