Hitachi EC701HP Operation Manual page 40

Section 3 - Installation (ATSC EC701HP Transmitter)
Distance between the Rx and Tx Antennas
They should be placed as far as possible from each other in order to isolate the transmitted
signal from the received signal.
Polarization
It is very important to verify the polarization of the received signal, which can be vertical, horizontal
or circular.
Phasing
When receiving a signal with vertical polarization, the system must be mounted vertically,
otherwise the gain of the antenna will be drastically reduced, likewise in case of a signal with
horizontal polarization.
To receive a signal with circular polarization with a non-circular antenna, the system can be
mounted either vertically or horizontally.
Stacking antennas
When using this system, the distance between them depends on the kinds of antenna used and
the kind of stacking used. This must be studied thoroughly in order to obtain the best solution for
each case.
Cables and Connectors
All cables must be carefully installed in order not to be twisted during the installation process.
When using 7/8" or 1/2" cables, please pay attention to their bending that must not be made in
spaces smaller than 80cm. The cables can't force the connectors in the Input/Output of the
equipment. The entry holes for the cables in the shelter must be done in a way to avoid the water
that runs along them to get inside.
Follow the manufacturer 's instructions when assembling them. All splices done outside the
shelter must be isolated with a special plastic tape and/or a plastic insulation material.
Avoid using silicon to coat the isolation made with auto-fusion tape. It has been verified that the
silicon chemical characteristics may provoke the drying of the auto-fusion tape.
Manual Rev. 0.0 - March 2018 3-3