Technical data

234 Chapter 8
CDMA Over Air
Optional CDMA Over Air Measurement Settings
CDMA Over Air
Setting the Active Channel Threshold Level and Auto Threshold
Level
The active channel threshold level is an advanced setting that can be set to indicate
which code channels are considered active. Any code channels exceeding this power
level are considered active traffic channels and any code channels below this power
level are considered inactive (or noise). A horizontal red line on the screen
represents the threshold level. The test set can set this level automatically, or you
can manually enter a value.
In Auto mode the threshold level moves as the noise fluctuates. The threshold level
is set by the test set at an optimal offset above the average noise floor. If you choose
Auto mode, you can alter the auto threshold offset. The recommended and default
setting is 0 dB. A negative value moves the threshold lower (closer to the noise
floor) and is a more aggressive setting that increases the likelihood of interpreting an
inactive channel as active. A positive value moves the threshold higher (away from
the noise floor) and is a more conservative setting that increases the likelihood of
interpreting an active channel as inactive.
In Manual mode the threshold level is fixed and does not move as the noise
fluctuates.
To Set the Active Channel Threshold Level:
Step Notes
1[Setup]
2 On [Thresh Lvl] select
Auto or Manual.
Each time you press this softkey, the selected
option changes. If you choose Manual, you must
enter the threshold you want using the numeric
keypad, then press [dB].
3 [Auto Thres Offset] The default value is 0 dB. Optionally, you can enter
a negative (more aggressive) or positive (more
conservative) value, then press [dB].