Harris Atlas DVL400, Technical Manual

Page: 41 / 180

2/25/03 888-2473-001 2-11
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation / Initial Turn-On
ATLAS Series™
2.8 Signal and Ground Connections
NOTE:
Control and signal wires should never be run in the same conduit with any
AC wiring. A separate conduit should be used for control and signal cables.
Connect an MPEG Transport Stream DVB ASI input to each exciter.
Depending on purchased options, each exciter also has inputs for a GPS Aerial, 1
PPS input, 10MHz Reference and Demodulator A. For more information refer to
the V-XCAST exciter manual.
Connect the sample cables from the Forward and
Reflected directional couplers at the system output
(after the filter).
These samples connect to a small
Customer I/O panel, with 2 "N" style connectors,
mounted to the ceiling of the cabinet. J1 is for Total
Forward and J2 is for Total Reflected. If necessary, these
samples will be calibrated using the GUI after initial
turn-on. These cables are not supplied since the required
length is determined at each site. For 2 cabinet systems
see 2.10.1 RF Sample Connections.
Connect a ground strap from the transmitter cabinet
E7 to the station ground.
There is a brass ground block
located in the center of the cabinet. Remove the block,
punch holes in the copper ground strap and then mount
the strap under the block. The copper strap must be at
least 5cm wide and 0.5mm thick.
2.9 External Interlock Connections
The transmitter has inputs for up to four external interlocks on the External I/O
Board. More may be used by placing 2 or more interlocks in series. The transmitter
is shipped from the factory with jumpers in the External Interlock positions which
will allow the transmitter to operate with no external interlock connections. The
electrical installation drawing (843-5550-189 or 843-5550-218) shows that
Interlock #1, J18-1 to J18-2, is used by the 3 Port U-Link Panel or possibly a
motorized switch. The other three are to be used at the customers discretion. The
External Interlock circuit requires a closed connection between
all of the following
terminals on the External I/O Board to turn the transmitter on:
•
J18 pins 1-2 (connected to 3 Port U-Link Panel or switch)
•
J18 pins 3-4
•
J18 pins 5-6
•
J18 pins 7-8