Harris Broadcast Flexiva FAX 10KW, Technical Manual, Page: 33 / 168

FAX 5/10/20/30/40KW
October 28, 2013
1 ‐ 19
888 ‐ 2720 ‐ 001 WARNING: Disconnect primary power prior to servicing. Copyright ©2013, Harris Broadcast
1.10 Selecting Location for Transmitter Placement
Selecting a good location for the transmitter to be placed is very important. There are several points that should be
considered if the transmitter is in a new location or being moved to a new building. Read through each point to
ensure a proper and safe installation.
•
Make sure doors into the site are large enough to accommodate the transmitter. Doorway height can some ‐
times be a problem. If the doors are not tall enough extra manpower may be required to get the transmitter
tipped down to clear the door.
•
Ensure the floor where the transmitter is to be placed can support the weight of the transmitter. See the ECM
sheets in this section for dimensions and weight of your model.
•
The location should be selected so there is enough clearance around the transmitter with the doors open to
meet local electrical and safety codes.
•
Breakers and or disconnects should be within sight of the transmitter. If possible the best location is directly
behind the transmitter on the wall.
•
Proper lightning protection should be installed in the building by a professional electrical contractor. Ensure
that it is installed as close to the AC Mains entrance into the building as well as close to the station reference
ground.
•
If the transmitter is installed in a high RF environment, it is a good practice to utilize cable ferrites on all con ‐
ductors to minimize RF interference.
•
Do not install the transmitter in places where it may be exposed to mechanical shocks, excessive vibration,
dust, water, salty air, or acidic gas.
•
If outside air is brought into the building it should be well filtered to keep dirt out of the building and the
transmitter. See Section 1.11 Cooling for further details.
•
Ambient temperature and relative humidity should always range between the following limits at the installa ‐
tion location:
Ambient temperature: 0 to +45
o
C
Relative humidity: 5 to 95% non ‐ condensing
Note
Failure to follow these installation instructions may void the warranty.
•
Plan the RF transmission line runs so that a minimum number of elbows are required, this will allow for best
performance. It is usually best to install the RF line first, since it is easier to work around it with the AC con ‐
duits and the air handling duct.
1.11 Cooling
Flexiva series transmitters use forced air cooling provided by multiple internal blowers to remove the heat generated
by the signal generation and amplification processes.To avoid operational problems due to excessive temperature,
the blower openings must not be blocked. The transmitter Outline Drawing 843 ‐ 5614 ‐ 103 provides an indication of
the relative location of the transmitter blowers and the necessary clearances to respect.
Air input is from the transmitter front with hot air exhaust at the rear of the amplifier. When factory rack integration
has been provided, the exhaust air exits through a vent at the top of the rack. An optional intake plenum is available
for Harris Broadcast supplied racks to permit connection to an external ducted air system at the top of the rack if
desired.
When the transmitter components are mounted in a customer supplied rack, care must be taken not to overheat the
other pieces of equipment already installed in the rack. The exhaust from the Flexiva amplifier chassis will typically
be 10
o
C to 20
o
C hotter than the ambient air. In many cases, this may necessitate use of a vented rear rack door or
removal of rear rack door altogether. Additionally, sufficient rear clearance must be left behind the Flexiva amplifier
chassis exhaust ports, typically 15cm (6 in.) or greater.