Technical data

Chapter 19 537
W-CDMA or W-CDMA (with HSDPA) Analyzer
Using the W-CDMA or W-CDMA (with HSDPA) Analyzer
W-CDMA or W-CDMA (with HSDPA)
Analyzer
Over Air Test to make HSDPA-specific measurements, although other W-CDMA
measurements can still be made without this option installed on your test set.
This chapter covers Option 240 - W-CDMA Analyzer installed on its own, and
Option 240 - W-CDMA Analyzer installed together with Option 245 - HSDPA
Analyzer & HSDPA Over Air Test.
Where differences exist between using Option 240 - W-CDMA Analyzer installed on
its own, and using it in conjunction with Option 245 - HSDPA Analyzer & HSDPA
Over Air Test, these differences are usually called out in this document. Where the
differences are small, however, they are not called out.
Example of a difference that is not called out: a title on a menu can be either
W-CDMA Anl. or HSDPA Anl. depending on whether or not Option 245 - HSDPA
Analyzer & HSDPA Over Air Test has been installed. The keys under that menu do
not change, and only the title of the menu changes. Such differences are not called
out here.
Selecting a Reference
The E7495A/B supports three different types of frequency reference input for
making frequency measurements. These are listed in the table below.
E7495A/B Reference Inputs
It is strongly recommended that you use the Global Positioning System (GPS) signal
Reference Type of reference provided Notes
GPS Ref Time and Frequency Strongly recommended – provides
accurate and network-independent
measurements
Ext Ref Frequency Only:
2.048 MHz, 10 MHz or
13 MHz
Recommended if no GPS signal is
obtainable. Will only measure
frequency and frequency error relative
to BTS reference
Int Ref Frequency Only:
Uses the test set’s internal
oscillator
Only recommended if no other
reference signal is available. You must
typically be within 750 Hz of the base
station operating frequency when
entering frequency or channel
information in order for the test set to be
able to lock to the Tx signal.