Nera Saturn BM Marine, Installation Manual

Page: 19 / 56

19
Installation Manual
Saturn Bm
PLANNING
Laying cables
General
At the Antenna Unit
At the Main Control Unit
Distress Alarm Unit/
Message Indicator Unit
Telephone and/or telefax
At the gyro
The coaxial cable for connection between the MCU and the Antenna Unit
should, if possible, be laid before the equipment arrives. Make sure sufficient
length of cable is ordered.
Where exposed to mechanical wear (on deck, through bulkheads etc.), the
cable should be protected by steel pipes. Standard procedures should other-
wise be followed for cabling in ship installations.
Special attention to existing safety regulations is required if the cable passes
through zones where there may be flammable or explosive gases. Use suit-
able gasproof cable glands or bushings.
Double screen 50
Ω
coaxial cable must be used. The maximum length of the
coaxial cable is limited by the DC and RF loss through the cable:
Maximum DC loss: R loop 0.6 ohm
Maximum RF attenuation at 1525-1660 MHz: < 10 dB
The table below lists suitable double screened coaxial cables between MCU and ADE:
A free end of approximately 1.5 m of the antenna cable above the radome
bottom should be provided for connection to the coaxial connector in accord-
ance with the installation instructions in "
Connecting up Above Decks
Equipment ".
The coaxial cable from the Antenna Unit should be given a free end of
approximately 0.5 m at the Termination Box location.
The prepared Distress Alarm / Message Indicator cable (2 m) with plug can
be connected directly to a locally installed unit, or to the Termination Box for
remote installation of unit(s). Provide remote cable with free ends of 0.5 m at
both ends.
Choose the position for the required wall sockets and lay the cables leaving a
free end of 0.5 m. Also allow a free end of 0.5 m at the Termination Box.
The gyro cable is terminated at the Termination Box. Allow a free end of
0.5 m. The amount of free cable required at the gyro depends on type to be
installed.
N/female
TNC
max. length
for 10dB/0.6
Antenna Cable
at the MCU
Antenna cable Reference
Bending
radius
Suitable coaxial connectors
at the MCU at the ADE
RG214 MIL-C-17 108 mm 25 m
129 mm 75 m
160 mm 95 m
275 mm 172 m
Diameter
10.8 mm
12.9 mm
16.0 mm
27.5 mm
390 mm 225 m 39.0 mm
500 mm 270 m 50.0 mm
“Pigtail”
QRPM 911 077-600
at the ADE
11N-50-7-5
11N-50-10-4
+ “pigtail”
11N-50-10-4
S 10172 B-11
(QTZC 502 012)
11N-50-7-5
+ “pigtail”
N/male
N/male
11N-50-12-10
+ “pigtail”
11N-50-12-10 RF 1 /
2
” 50
11N-50-23-10
+ “pigtail”
11N-50-23-10
RF 7 /
8
” 50
RF 1 1 /
4
” 50
Mounting the coaxial connector, see Appendices to
11N-50-32-2
+ “pigtail”
11N-50-32-2
RF 1 5 /
8
” 50
11N-50-42-2
+ “pigtail”
11N-50-42-2