Technical data

Chapter 2 - Installation
CAUTION
Ensure the casing ground connection is the FIRST connection made to the unit, and
the LAST to be disconnected.
Interference problems will be minimized by effective and direct ground
connections. A screened data cable should be used and grounded at the
GPS Receiver connector end. When fitting the host connector, it is
desirable to connect both the screen and drain wires to a connector
having 360° connectivity (no tails). Any other solution degrades the
EMC performance. For details of power supply grounding, see Power
Connection, page 2-20.
Antenna Connection
After mounting the antenna (page 2-2), route the cable to the
connection on the GPS Receiver marked ‘ANTENNA’. Use the cable as
supplied by Alvarion
, do not lengthen the antenna cable as this may
have an adverse effect on signal attenuation and overall system
performance. The cable as supplied also provides correct RF screening,
and protection from pulses inducted on the antenna cable by lightning
strikes.
Output (Timing/Frequency) Connection
The GPS Receiver makes a number of different outputs available for
user selection. Referring to Figure 2-12, these connectors are as
follows:-
 J3 1PPS = 1 pulse per second 488ns wide pulse – active low
 J4 2.048MHz = square wave
Command Channel to Alvarion eMGW/MGW System
The Command Channel Port is of a bi-directional RS232D type for
control and data interchange. Use the cable provided with the Alvarion
eMGW/MGW System to connect this port. The cable has one 9-pin
male connector to mate with the Command port of the GPS Receiver,
the other end has a 9-pin male connectors to mate with the CMD port of
the Alvarion eMGW/MGW System.
GPS Timing Receiver Installation and Operation Manual
2-18