User's Manual

Digital UHF Transmitter Chapter 3, Installation and Setup Procedures
DT835A, Rev. 1 3-5
If trays are pre-mounted in the exciter
cabinet, remove the two L-brackets,
mounted on the front panel rails of the
single exciter cabinet, which hold the
trays in place during shipment. The UHF
amplifier trays are shipped separately
from the amplifier array cabinets because
of the weight of each tray. The trays are
mounted in the cabinet using Chassis
Trak cabinet slides. The tray slides are on
the top and bottom of the UHF amplifier
trays and on the sides of the UHF exciter
tray and the variable phase/gain trays.
Inspect the trays for any loose hardware
or connectors, tightening where needed.
Open the rear door; the key to unlock
the door, if the door has the optional
lock, is found in a tan envelope taped to
the door. Inspect the interior for packing
material and carefully remove any
packing material that is found. Slowly
slide each tray in and out to verify that
they do not rub against each other and
have no restrictions to free movement.
Note: The UHF amplifier trays must
be placed into the cabinets in the
proper location, and according to the
labeling on each tray, or the gain and
the phasing will not be maximized.
The UHF amplifier trays are labeled to
indicate where they are positioned in the
side A or the side B amplifier cabinets.
They are mounted in each cabinet from
bottom left to top right, with A1 the
bottom, left tray and A6 (if used) the top,
right tray. Locate the tray labeled A1 and
slide it into the side A cabinet in the
bottom, left position. Locate the tray
labeled A2 and slide it into the side A
cabinet in the bottom, right position.
Locate the tray labeled A3 and slide it
into the side A cabinet in the middle, left
position. Locate the tray labeled A4 and
slide it into the side A cabinet in the
middle, right position. Locate the tray
labeled A5 and slide it into the side A
cabinet in the top, left position.
Locate the UHF amplifier tray labeled B1
and slide it into the side B cabinet in the
bottom, left position. Locate the tray
labeled B2 and slide it into the side B
cabinet in the bottom, right position.
Locate the tray labeled B3 and slide it
into the side B cabinet in the middle, left
position. Locate the tray labeled B4 and
slide it into the side B cabinet in the
middle, right position. Locate the tray
labeled B5 and slide it into the side B
cabinet in the top, left position. All of the
amplifier trays should now be installed.
Slowly slide each tray in and out to verify
that they do not rub against each other
and have no restrictions to free
movement.
Caution: Each UHF amplifier tray has
a hard-line coaxial cable connected
to the rear panel. The tray will not
slide out without first removing this
connection.
In order to pull out the tray for test
purposes or other reasons, use the test
cable included in the installation material
kit for connections from the tray to the
output cable.
It may be necessary to make
adjustments to the positions of the trays.
This can be accomplished by loosening
the cabinet slide mounting bolts that hold
the front of the slide to the mounting
frame of the cabinet and moving the tray
up or down or left or right, as needed, to
correct for any misalignment.
3.3.1 DM8-R Modulator Installation
1. If not pre-mounted, remove the
modulator tray from the shipping box
and inspect it for any damage that
may have occurred during shipment.
Remove all packing material used to
protect the unit during shipment.
2. The tray mounts using four clearance
holes into a standard 19" rack or
cabinet. Mount the tray into the
cabinet and adjust or align the tray
so that it does not interfere with
cabling or other trays.