Anritsu Spectrum Master MS2720T, Руководство пользователя

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3-6 EVDO Over-The-Air Measurement Setup EVDO Signal Analyzer
3-12 PN: 10580-00235 Rev. D 3GPP2 MG
3-6 EVDO 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 (a no trouble found (NTF) event), 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. The result is fewer NTFs and elimination of their associated costs.
If you choose to measure EVDO performance over the air with an antenna, then additional
setup is required, as explained in the setup section. The instrument needs a timing reference
in order 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.
To make EVDO OTA measurements, connect the instrument to the base station and perform
the following setup procedure:
1. Press
Freq
main menu key then press the
Channel
submenu key and use the
Up/Down
arrow keys, the keypad, or the rotary knob to select a channel number for the selected
signal standard. The center of the channel is tuned to the center of the display.
2. Press the
Setup
main menu key to open the Setup menu.
3. Press the
PN Setup
submenu key and choose
GPS
. Follow the setup instructions
“GPS Setup” on page 2-3 .
4. Press the
PN Search Type
submenu key and select
Auto
.
5. Press the
Setup
main menu key then press the
Walsh Codes
submenu key to toggle
between
64
codes and
128
codes depending upon the transmitting signal.
6. Press the
Measurements
key to open the measurements menu.
7. Press the
OTA
submenu key to activate Over-The-Air measurements.
Note
64 Walsh Codes can be displayed when the unit is in 128 code mode. The Walsh
Codes will be repeated on the measurement screen.
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