Sailor RT5022, Operation Manual

Page: 51 / 60

47
Installation
0505
Cable Connection Diagram
39735
H1
H2 H3
H4
X1 X3 X2
X4 X5 X6
J 2
J 1
7
4
2
5
LS-
3
6
DATA-
1
12
13
15
14
11 LS+
X1
10
+12.5V
8
12
13
15
GND
14
EXT LS
11
7
3
10
6
Line out
1
5
2
4
X5
RX AF-
X6 X4
9
8
Line out
9
EXT LS
VHF/CU
VHF/CU
EXT LS
EXT LS
CU LS
+12.5V
GND
RX AF+
TX AF-
TX AF+
CU/CB VHF CU
+12.5V
DATA+
CU LS
X6 : J 1 & J 2 MOUNTED = VHF
J 1 & J 2 NOT MOUNTED = CU
X3 X2
12
13
15
14
10
VHF DSC
CU 1 (Optional)
Ext. speaker (CU)
CU 2 (Optional)
Ext. speaker (CU2)
Ext. speaker (VHF)
9.3 Power supply
The VHF should be powered from a separately fused DC-supply of 10.8 - 32VDC and rated
at minimum 120W continuous power.
9.4 Antenna installation and precautions
9.4.1 Antennas
The VHF equipment requires two antennas installed, one for the DSC receiver and the other
(Primary) for the VHF Rx/Tx communication.
All commonly available 50 ohm antennas covering the appropriate frequency range and
exhibiting a VSWR less than 1.5 over this range, may be used.
The antennas should be connected using a low loss type 50 ohm coaxial cable, e.g. good
quality RG213.
IMO recommendations state a minimum of 6W RF power to be available at the VHF
transmitting antenna thus implying that the absolute maximum power loss across the
antenna cable length (incl. connectors) for 25W power output available from the VHF may be
18W (i.e. 6dB power loss). The maximum cable length thus depends on the quality of the
cable used, i.e. the specified attenuation (dB/m) imposed by the cable at the high end of the
VHF frequency band. As a rule of thumb the cable length using RG213 coaxial cable should
not exceed 40m.
Note: A corresponding degradation of receiver sensitivity is imposed on the installation, i.e.
if the installed cable length exhibits a power loss of 6dB the reception sensitivity is also
reduced by 6dB.