User Manual

UHF Analog Driver/ Transm it ter Chapter 3, Sit e Considerat ions,
I nst allat ion and Set up Procedures
LX Series, Rev. 0 3- 1
Cha pt er 3
Site Conside r at ions, I nst allat ion a n d Set up Procedures
There are special considerations that
need to be taken into account before the
Innovator LX Series analog
driver/ transm itter can be installed. For
example, if the installation is com pleted
during cool weather, a heat - related
problem may not surface for m any
months, suddenly appearing during the
heat of summ er. This section provides
planning information for the installation
and set up of the driver/ transmitter.
3 .1 Sit e Con sidera t ions
The transmitter requires an AC input line
of 117 VAC/ 220 VAC @ 5 amps for the
10W transm itter and driver or 117
VAC/ 220 VAC @ 10 am ps for the 100W
Transmitter. The transmitter is factory
set for 110 VAC or 230 VAC operation.
The LX Series Analog Transmitters are
designed and built to provide long life
with a m inim um of m aintenance. The
environment in which they are placed is
im portant and certain precautions m ust
be taken. The three greatest dangers to
the transm itter are heat, dirt, and
moisture. Heat is usually the greatest
problem , followed by dirt, and then
moisture. Over- tem perature can cause
heat - related problem s such as thermal
runaway and com ponent failure. Each
am plifier m odule in the transm itter
contains a therm al interlock protection
circuit that will shut down that m odule
until the temperature drops to an
acceptable level.
A suitable environment for the
transm itter can enhance the overall
perform ance and reliability of the
transm itter and maxim ize revenues by
minim izing downtim e. A properly
designed facility will have an adequate
supply of cool, clean air, free of airborne
particulates of any kind, and no
excessive humidity. An ideal environment
will require temperature in the range of
40° F to 70° F throughout the year,
reasonably low humidity, and a dust - free
room . It should be noted that this is
rarely if ever attainable in the real world.
However, the closer the environm ent is
to this design, the greater the operating
capacity of the transm itter.
The fans are designed and built into the
transm itter will remove the heat from
within the modules, but additional means
are required for removing this heat from
the building. To achieve this, a few issues
need to be resolved. The first step is to
determ ine the amount of heat to be
removed from the transmitter room .
There are generally three sources of heat
that m ust be considered. The first and
most obvious is the heat from the
transm itter itself. This am ount can be
determ ined for a 100W transmitter by
subtracting the average power to the
antenna (69.5 wat ts) from the AC input
power (675 watts) and taking this
number in watts (605.5) and then
multiplying it by 3.41. This gives a result
of 2,065, the BTUs to be rem oved every
hour. 12,000 BTUs per hour equals one
ton. Therefore, a 1/ 4- ton air conditioner
will cool a 100W transm itter.
The second source of heat is other
equipm ent in the sam e room . This
number is calculated in the sam e way as
the equation for BTUs. The third source
of heat is equally obvious but not as
sim ple to calculate. This is the heat
coming through the walls, roof, and
windows on a hot sum mer day. Unless
the underside is exposed, the floor is
usually not a problem. Determining this
number is usually best left up to a
qualified HVAC technician. There are far
too many variables to even estimate this
number without reviewing the detailed
drawings of the site that show all of the
construction details. The sum of these
three sources is the bulk of the heat that
must be removed. There may be other