Furuno FELCOM251, Installation Manual

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2. INSTALLING THE SYSTEM
2-26
2.5 Installing the Communication Unit
2.5.1 Overview
Because the Communication Unit comes in two versions, there are two sections de-
scribing installation of the Communication Unit:
• one section for the Communication Unit (this section) and
• one section for the 19” Rack Communication Unit
(section 2.6.3).
2.5.2 Grounding the Communication Unit
Antenna Unit cable
The antenna is connected to the Communication Unit by means of the coax and pigtail
cables (installation materials).
For the FELCOM501 Antenna Unit the coax cable is connected with a TNC connector
at the Communication Unit end and an N connector at the antenna end.
For the FELCOM251 Antenna Unit the coax cable is connected with a TNC connector
at both ends.
For information on antenna grounding, see section 2.3.1.
At the Communication Unit end, it is strongly recommended to ground the antenna ca-
ble.
The TNC connector is grounded through the cable support, which must be connected
to the hull or other common ground.
Ground stud
To ensure that the Communication Unit is grounded – also if the cable is disconnected
from the Communication Unit, connect an extra ground wire to the ground stud on the
Communication Unit. This ground wire must be a heavy wire or braid cable with a larg-
er diameter than the coax cable. The ground stud is located next to the power switch.
Ground stud