User's Manual

NOMAD™ - LK3A-2
OPERATING INSTRUCTIONS
PAGE 6 of 9
3. INSTALLATION
The LK3A-2 has been designed to be permanently installed
3.1 MOUNTING
Whilst the general location for each link unit will be dictated from a system
viewpoint individual link units should adhere to the following guidelines
1. Avoid mounting adjacent to metal pillars etc.
2. The antenna should have a vertical orientation.
It is usual to mount the link unit suspended over a main path with the
antenna pointing vertically downwards. A fixing kit is supplied that assists in
attaching the link unit to parallel overhead support wires, see figure 1 at the
end of this manual.
3.2 CONNECTIONS
The network connection should be made using screened twisted pair cable
with a characteristic impedance of 110Ω. When connecting multiple link
units to a single controller each item of equipment (link unit or controller)
should be daisy chained - the cable starts at one item and then goes to the
next, and then the next and so on. Do not use a star configuration - one
item has connections running from it to more than two other items.
The last two items, and only the last two items, in the chain should have
their terminators switched on. For the link units this is achieved by sliding
switch SW2 to the left - see above.