Technical data

Chapter 3 87
1xEV-DO Analyzer and Over Air Test
Optional 1xEV-DO Tx and Over Air Analyzer Measurement Settings
1xEV-DO Analyzer and Over Air
Test
Setting the Multipath Power Limit
Multipath Power is only relevant to Over the Air measurements. It does not apply to
Transmitter measurements.
Multipath power is the amount of power, of the dominant pilot signal, that is
dispersed outside the main correlation peak due to multipath echoes (expressed in
dB). Ideally, this value should be very small (< 0.1 dB). Multipath power is the
result of portions of the original broadcast signal arriving at the receiving antenna
out of phase with the main power of the original signal. This can be caused by the
signal being reflected off objects, such as buildings, or being refracted through the
atmosphere differently from the main signal. These out of phase signals can cancel
power from the main signal or appear as noise interference at the receiver.
If the measured Multipath Power meets the limit you have set, the numeric result
displayed in the OTA PN Scanner section of the screen is displayed in green. If the
measured Multipath Power fails to meet the limit you have set, the result is
displayed in red font, and all metrics displayed in the metrics portion of the screen
will be displayed in gray. This is to indicate to you that the metrics you are seeing
are unreliable because the Multipath Power limit has not been met.
To Set the Multipath Power Limit:
Setting the PN Scanner Sensitivity
PN Scanner Sensitivity determines the noise floor for the OTA PN Scanner. You can
select from three sensitivity levels—Low, Medium, or High. Setting the sensitivity
to High will result in a lower noise floor but will descrease the measurement speed.
Setting the sensitivity to Low will result in a higher noise floor and decreased
measurement speed.
PN Scanner Sensitivity is coupled to the OTA PN Scanner. If the OTA PN Scanner
is Off, the PN Scanner Sensitivity is disabled; if OTA PN Scanner is On, PN
Scanner Sensitivity is automatically enabled.
Step Notes
1. [Setup]
2. Press [Mp Pwr]. Specify the Multipath Power Limit level in dB.
The minimum setting is 0.0 dB, and the maximum
setting is 2.0 dB
3. [dB]