PCTEL SeeGull EXflex, Справочное руководство

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SeeGull
®
EX flex
®
Reference Manual
PCTEL, Inc., RF Solutions Page 13 Revision F
4. Operation
This section discusses calibration, software
upgrades, and integrating the SeeGull
EXflex scanning receiver into
the user’s test
system.
4.1. Calibration
SeeGull EX flex scanning receivers are
calibrated at the factory. The calibration
data is stored in the internal non-volatile
memory for each 1 dB step for the whole
input signal dynamic range. Recalibration is
recommended every year in order to
maintain the specified accuracy levels.
Please refer to the Calibration Notice in
Calibration section for more information.
Re-calibration is available as an optional
service from PCTEL Inc., RF Solutions.
4.2. Software Upgrades
SeeGull EX flex scanning receiver stores the
application program in internal non-volatile
memory, and accordingly, is capable of
being upgraded via software. Upgrades
may be needed to incorporate new features
or bug fixes. Please note that some
upgrades can only be performed at
PCTEL’s factory.
4.3. Controlling the Scanner and
Acquiring Data
A unit is controlled, and the measurement
data is received via the USB data cable.
Control of the SeeGull EX
flex scanning
receiver is dependent upon the PC software
in order to collect data coming from
measurements taken from the SeeGull
EX
flex scanning receiver.
4.4. Holdover Option Operation
When a GPS signal is present, CDMA and
EV-DO technologies use the GPS data for
timing information to decode the signals.
With the Holdover option, the SeeGull
EX
flex will continue to accurately decode
the pilots and cell IDs for a period of 4 hours
in the absence of any GPS signal. To get
the best performance of the Holdover option
during indoor measurements, we
recommend that the GPS be locked for at
least 30 minutes before using the SeeGull
EX
flex scanning receiver in an unlocked /
holdover mode (with power maintained).
Note: It is highly recommended to have the
SeeGull EX flex Scanning Receiver
recalibrated every year.