Anritsu Spectrum Master MS2720T, User Manual

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2-6 CDMA Over-The-Air Measurement Setup CDMA Signal Analyzer
2-10 PN: 10580-00235 Rev. D 3GPP2 MG
2-6 CDMA Over-The-Air Measurement Setup
OTA (Over-The-Air) testing provides field technicians with the ability to monitor
hard-to-reach pole-top base stations. Traditionally, the repair process for pole-top base
stations entailed pulling down the failed base station, then installing a new one. The failed
base station was then returned to the manufacturer or repair depot for service. If a base
station was determined to be healthy (no trouble found, or NTF), then the cost of the process
was incurred unnecessarily. OTA testing provides information about the health of the base
station, thereby improving the likelihood that a correct decision will be made with regard to
the base station condition. The result is fewer NTFs and elimination of associated costs.
If you choose to measure CDMA performance over the air with an antenna, then additional
setup is required, as explained in the following sections. The instrument needs a timing
reference to determine PN Offset and timing errors. This reference comes from the base
station GPS when it is connected to the instrument or it can be recovered from GPS when a
GPS antenna is connected.
The Over-The-Air (OTA) Measurement option consists of Pilot Scan, Multipath, and Limit
Test.
1. Follow the setup instructions for “GPS Setup” on page 2-3 .
2. Press the
Setup
main menu key then the
Walsh Codes
submenu key to choose
64
codes
or
128
codes depending upon the transmitting signal.
3. Press the
Measurement
main menu key to open the Measurements menu.
4. Press the
OTA
submenu key to activate Over-The-Air measurements.
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