User`s guide

150 Agilent E6474A User’s Guide
B GPS Connections for E74xx Systems
• The navigator data cable is connected to the AUX port. All
other connections to the navigator are the same as shown in
the figures.
For more information on systems that include the E6473B High
Speed Direct Connect Hub, refer to Chapter 3.
E645xx Receiver with Internal GPS Option
Agilent E645xA and E645xB receivers with the GPS option and
Agilent E645xC receivers include an internal GPS receiver.
When the GPS receiver is locked onto the GPS signal, navigation
data is provided with the receiver measurements.
To set up the GPS antenna:
1 Connect the GPS antenna to the GPS ANTENNA connector of
the receiver.
2 Position the magnetic-mount GPS antenna 18 inches (45.7
cm) away from other antennas. The GPS antenna must have
an unobstructed view of the horizon for best performance.
External 1 PPS Signal
An external 1 PPS (Pulse Per Second) signal is required for any
of the E6454xx CDMA receivers without internal GPS to "lock"
for correct PN correlation when making CDMA pilot analysis
measurements.
All E645x receivers without the internal GPS option can use a 1
Pulse Per Second (1PPS) signal from an external GPS to
improve the receiver’s frequency accuracy specification and
performance. This signal must be present on pin 9 of the cable
connected to the receiver’s GPS-RS232 port, as shown in
Figure 58. Cables purchased from Agilent meet this
requirement.
If you are using a GPS not supplied by Agilent, consult the GPS
manufacturer’s documentation to determine if its navigation
data cable provides the 1 PPS signal.