X-band 12kW Upmast Magnetron Transceiver
Chapter 7: CONNECTION DETAILS
HBK-2300-3 Issue 2
Page 26 of 40
7.3
Power Supply
The E70352 power supply is intended for use on ships DC power systems operating from 12 to 24
Volts DC.
OPTIONAL AC/DC POWER SUPPLY
Where no ships +24VDC is available an optional AC/ DC power supply can be supplied. See section
10 for details.
DC INPUT CABLE
The power cable can be extended for longer cable runs between the E70352 and the ships DC supply
or optional AC/DC power supply.
If you need to extend the power cable, use a waterproof junction box for external connections. The
junction box should provide a terminal strip with sufficient space for power connections. The terminal
strip should be a minimum of 30 Amp rating for power cores. It is essential that both power cores and
the screen (drain) are connected and that the connection is of a very low resistance as considerable
power passes through this connection.
The following table provides recommended total power cable lengths and gauges. These figures
relate to the maximum distance of power cables from the ships DC supply or optional AC/DC power
supply to the E70352.
CAUTION
Exceeding the following cable lengths may cause unreliable operation.
AWG
American Wire gauge
mm
2
Maximum distance
12 volt supply
Maximum distance
24 volt supply
7
10.55
15m
55m
8
8.36
10m
40m
10
5.26
8m
32m
11
4.17
6m
24m
NOTICE
If the required extensions result in unacceptably large diameter cables, use two or even smaller gauge wires to
achieve the required copper wire cross-section. For example, using two pairs of 2mm
2
cables is equivalent to
using two single 4 mm
2
cables.
EARTH / SCREEN WIRE EXTENSION
The earth wire can be extended for longer cable runs between the E70352 and your vessels RF
ground system.
Extensions to the screen (drain) wire should use an 8 mm braid or AWG 10 (5.26 mm
2
) multi stranded
cable.
