Harris Atlas DVL400, Technical Manual

Page: 42 / 180

2-12 888-2473-001 2/25/03
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation / Initial Turn-On ATLAS Series™
2.10 Cabinet Combiner Connections
(DVL 4300 and 5700 only)
Drawing #843-5550-172 shows one possible layout of the rf equipment for the high
power systems. This includes the connections and locations of the hybrid combiner,
reject load, filter and patch panel.
Each PA cabinet has a 1 5/8" rf output line which connects to the hybrid combiner.
The hybrid is marked for Cabinet1, Cabinet 2, Output and Reject Load connections.
NOTE:
It is very important that the cabinets be connected to the correct hybrid port.
If they are reversed then all of the power will end up in the reject load port. If
this happens, the drive cables (W57 and 73) at the output of the DCU should
be reversed as well.
Precision directional couplers for measuring forward and reflected power should be
installed both before the filter and at the system output for measuring and
calibrating power. If the precision couplers are supplied by Harris, they will come
with a coupling chart which can be used for calbration purposes.
2.10.1 RF Sample Connections
Connect the RF Sample from the cabinet combiner reject load to J17 of the RF
monitor board in Cabinet 1.
The hybrid combiner reject load is a water cooled
load which should also have an rf sample port between it and the hybrid. This
sample coupler is labeled DC4 on the 843-5550-100 Additional Cabinet Wiring
Diagram. This sample is used for Cabinet Phasing. This cable is not included since
the required length is determined at each site.
Connect the System Forward and Reflected directional coupler to the
transmitter.
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.
NOTE:
For 2 cabinet systems these samples can be taken at DC3 (directional coupler
3) which is after the cabinet combiner but before the filter or can be con-
nected to the directional coupler after the filter. The choice of which sample
to use is to be decided by the customer or by site requirements.