
10
Antenna Best Practices
Do Don’t
Mount the antenna outside as high as
possible, preferably above the roof or other
objects.
Mount the antenna underground, in a dry well,
or inside a canned lift station.
Mount the antenna above all metal surfaces
close to the installation.
Mount the antenna horizontally or bend the
antenna whip.
Coil excess coax in circles of 5 to 7 inches in
diameter. Pinching or tight bends in the coax
can restrict the high frequency/low power radio
signal path in much the same way water ow
is restricted through a tight bend in a hose.
Mount the antenna inside a metal control
cabinet. Even berglass cabinets degrade the
signal.
Ensure that the weight of the cable does not
damage the antenna base. There should be
enough slack in the cable so it does not rest or
touch the top surface of the mounting bracket.
Mount the antenna on the side of a metal
cabinet or adjacent to a tank. Metal surfaces
will reect the radio signal, preventing it from
traveling in all directions.
Incorporate a drip loop when installing the
cable to prevent water from penetrating into
the building or enclosure.
Cut, lengthen, or shorten the coaxial cable.
Mission can supply antenna extension cables
and connectors up to 50 feet. For lengths
above this limit, another RTU mounting
location should be considered.
Wiring Best Practices
• Signal cables should not run parallel with high voltage AC wires (load conductors).
• Where signal wires and load conductors must cross, do so at right angles.
• High voltage should not enter the Mission RTU. Mount the supplied transformer outside the
Mission enclosure.
• Lay wires in wire trays with the excess near terminations. Replace wire race covers (follow
NEC and your local/state electrical codes requirements).
• Cables used for digital and analog inputs should be 18 to 22 gauge, shielded, twisted pair
wire with the shield connected to ground at the RTU and not on the other end of the cable
(to prevent ground loop current).
• MOVs can be installed across AC contactor coil terminals to shunt voltage spikes away
from the RTU inputs and other electronics in the panel. Voltage spikes can be caused
by coils de-energizing. The included MOVs are rated for 120 V circuits and will suppress
excess voltage above 150 V. These parts are application dependent. They have a nite
lifespan and will need to be replaced over time.