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Manual 7-9547-1 12/09/14 Page 21
nals are present, making them more prone to inter-
modulation or carrier desensitization problems.
Receiver preamplifiers should not be used.
FEEDLINE DATA
As part of the installation process you will need to
determine the cable losses for your main and test
transmission lines. These loss values can be deter-
mined by sweeping the cables or they can be
looked up from the cable manufactures specifica-
tions. For your system these values will be fixed
once the cable type is chosen and cut to length.
Once you have determined the main and test line
cable loss for your system this information can be
recorded in system memory for future reference
using the Feedline Data menu selection. To save
the cable loss values in memory perform the follow-
ing steps.
1) From the default display press the DOWN
ARROW button on the front panel to scroll
through the menu choices until you reach the
FEEDLINE DATA menu
.
2) With the FEEDLINE DATA menu displayed
press the ENTER button to step down to the
MAIN LINE LOSS sub-menu.
3) Use the UP and DOWN ARROW buttons to set
the main line loss to the desired value. This
storage register works in a forward loop fashion,
starting at 0.0 and increasing to 9.5. A button
press after 9.9 returns the setting back to 0.
4) After setting the main line loss value press the
ENTER button to return back to the FEEDLINE
DATA menu. This will save your setting choice.
5) With the FEEDLINE DATA menu displayed
press the ENTER button to step down to the
MAIN LINE LOSS sub-menu. Press the UP
ARROW button to move to the TEST LINE
LOSS sub-menu.
6) Use the UP and DOWN ARROW buttons to set
the test line loss to the desired value. This stor-
age register works in a forward loop fashion,
starting at 0.0 and increasing to 20.0. A button
press after 20.0 returns the setting back to 0.
7) After setting the test line loss value press the
ENTER button to return back to the FEEDLINE
DATA menu. This will save your setting choice.
Then pressing the CANCEL button while at the
FEEDLINE DATA menu will return you to the
default display.
OPTIMIZING THE SYSTEM
In the TTA system the first stage of amplification is
in the tower top box which is used to overcome the
main line loss, develop the noise figure, and the
Figure 12:
Application of rubber splicing tape. NOTE: Additional waterproofing protection can be realized by
covering the rubber tape with either “Scotch Kote” or Vinyl plastic Electrical tape (“Scotch” brand 33+).
