Technical data

Chapter 7 191
CDMA Analyzer
Optional CDMA Tx Analyzer Measurement Settings
CDMA Analyzer
Setting the PN Offset
The PN Offset (Pseudo-Noise Offset) key allows you to set the analyzer to find the
PN Offset automatically, or to set it to manually to a known value.
The PN Offset is a short code sequence that provides a unique identifier for each
sector of each cell site. There are 512 unique offsets 0 - 511), which the access
terminals use to decode the information broadcast by the access network.
Setting the PN Increment
The PN Increment allows you to choose the increment step for the PN Offset.
Typically the PN Increment is set to 1 when measuring CDMA transmitter
performance while connected to the base station via RF cable.
The PN Increment field enables you to search based on a step size of your choice. If
PN Increment = 1 (default), the search will step through PN values by one PN at a
time. If PN Increment = 5, it will step through PN values 0, 5, 10, and so on. The
Measured PN displayed will be a multiple of 5, even if the actual PN is not a
multiple of 5. If you know that all base stations in the area have fixed increments,
then set the PN Increment field to that increment value. If you don’t know, then use
the default value of 1.
Step Notes
1. [PN Offset] Each time you press this key, the setting
toggles between
Auto and Manual.
2. If you are setting the PN Offset
manually, enter the PN Offset
number using the numeric
keypad.
Any value from 0 to 511 is valid.
3. If you are setting the PN Offset
manually, press [Enter]
Notice (and verify) that the number you
entered for your chosen PN Offset number
appears below the
PN Offset text on the
corresponding button. Note that no number is
displayed if the setting is
Auto.