Nautel NV7.5, Operation And Maintenance Manual

Page: 18 / 183

NV10/NV7.5 Operations and Maintenance Manual
Page xviii Issue 3.4 2016-08-03
The RF connection to the transmitter output can be a serious safety hazard. Connect a 50

test load during installation and commissioning. It is recommended that a switch be used to
automatically connect the transmitter to the antenna system without human contact with the
transmitting conductors.
Safety Interlocks
The transmitter contains an electrical interlock, which is an external circuit that turns off the
RF output if any of its switches are opened.
Ac Disconnect Switch
Safe operation of the transmitter requires an ac disconnect switch. Lock the ac disconnect
switch in the disconnected (open) position during the installation process.
Equipment Safety
Electrostatic Protection
The transmitter’s systems are very rugged and resistant to damage. However, it is possible for
damage to occur because of high voltage electrostatic discharges during servicing. Train all
service personnel to ground themselves to bleed off any static charge before opening the
transmitter or touching any exposed components. Provide a grounding wand or known
ground (e.g., a grounded metal table) that personnel can use to discharge themselves.
Surge Protection
Surge protection is recommended for your entire site. However, even if you do not use a surge
protector on the service entrance to the site, you should install a surge protector in the
transmitter’s ac power feed to prevent over-voltage from entering the transmitter.
Lightning Protection
The transmitter is designed to resist lightning strike damage. However, intense or repeated
strikes could damage the transmitter. We recommend that you install lightning suppression on
the antenna, tower and feedline to reduce the effect of lightning strikes on the transmitter itself
(and to protect the rest of your site equipment and your personnel). For detailed information
about lightning protection, see the Nautel Site Preparation Manual, available from your
Nautel sales agent, or online from the Nautel website.