Promax HD Ranger Lite, User Manual

Page: 89 / 184

July 2015
7-81
1
This tool needs an external LTE filter that has to be placed in the RF input
connector. By means this tool, this filter can be enabled to check if the quality
of the TV signal reception improves, when much of the LTE band has been
attenuated by the filter. With this tool you can measure the MER of a DTT
channel, presumably affected by an LTE signal, and evaluate the effects of
enabling an LTE filter.
To be clarified that these filters, internal or external, cannot completely
remove the LTE band signals. Especially for the TV channels close to 790 MHz,
where is the end for the current UHF. If we are close to a LTE station with low
downlink channels, a filter cannot be a sufficient solution.
Other options to better mitigate the LTE signals can be considered, such as a
change in the location of the TV antenna or a passive shield in the way
between the two antennas (TV and LTE).
7.7.2 Operation
The LTE Ingress Test input is available to all DIGITAL TERRESTRIAL
signals.
To access the LTE Ingress Test tool:
Connect the RF input signal to the equipment.
Tune the channel that is possibly affected by a LTE interference.
Press the key (Tools).
Select the LTE Ingress Test tool.
On screen appears a message to confirm that the LTE filter is not in
the RF input connector. Then press the : Ok key.
The meter is now measuring with no filter (filter OFF). The user
decides for how long.
To start measuring with filter, press again the key and on screen a
message appears. Now connect the LTE filter to the RF input and press
again the
:Ok key to start measuring with the LTE filter.
The LTE icon on the screen upper right corner means the filter is
enabled.
The user can enable / disable the LTE measure by pressing the
: ON/OFF. Remember to connect / disconnect the LTE filter to the
RF input. Each time a LTE measure starts, the time counter will reset.