DOC 4380A
4380A O & M Manual
7
098-00723-000
– Jul 2017 Revision 4.0
SyncSystem 4380A O&M Manual
2.3.4 USB Ports
The USB ports on the rear panel allow:
Users to access the command port (94000-115200). See section 2.3.2.2. Users can set the IP
Address on the box following the instructions in section 2.3.3.B-C. The system will
automatically connect to the command port and provide the 4380A> command prompt.
The 4380A to communicate with a 5071A Cesium Clock (94001-5071A). See section 2.7.
Note:
Microsemi recommends if you are going to use these cables that the cables should be plugged into
the unit when it is powered on.
2.4 Antenna Installation
Installing the antenna properly requires careful planning. The antenna location itself must be selected
based solely on the ability to reliably receive the GPS signal. This should be one of the primary factors in
selecting the installation location of this unit depending on the length of the antenna cable.
NOTICE
Note:
The antenna cable should have less than 10 dB of loss at 1.5 GHz. If this is not possible due to the
cable type or length of cable then additional in-line amplifiers will be need to be installed or you will need a
cable type with less loss.
The antenna included with the 4380 has a 5/8” coarse threaded mounting screw hole on the bottom. This
threaded hole allows the antenna to be easily and securely mounted on a 5/8” coarsely threaded rod.
Threaded rods are available at most hardware stores and will need to be mounted securely to the side of a
building or other stationary object. Once the rod is properly secured it will provide a stable mount for the
antenna.
2.4.1 Antenna Location
The 4380A is typically mounted in a standard 19” equipment rack, but the unit may also be operated from a
bench top. No matter which location is chosen, the installation location should be selected keeping in mind
that access to a suitable antenna location will be necessary for proper operation.
A.
Placement of the GPS antenna is extremely important. It should be placed so that it has clear view
of as much sky as possible. Any obstructions such as antennas, large metal objects, or buildings
will limit the performance of the 4380A. The GPS antenna should have an unobstructed line of
sight to the sky. (See Figure 1.)
B.
In selecting a location for the antenna, its proximity to the 4380A should also be considered.
Ideally, the antenna will be close enough to the 4380A so loss through the antenna cable is
minimized.
!
DANGER
An outside antenna system should not be located in the vicinity of overhead power lines or other
electric light or power circuits, or where it can fall into such power lines or circuits. When
installing an outside antenna system, extreme care should be taken to keep it from touching such
power lines or circuits as contact with them might be fatal.
Summary of Contents for SyncSystem 4380A
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