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Chapter 14
GSM Measurement Mode
Introduction
This chapter presents GSM information and procedures.
Configuration
To begin GSM measurements:
Step1. Press the MODE key.
Step2. Use the Up/Down arrow keys to highlight GSM and press ENTER to select.
Step3. Connect the base station to the Cell Master by connecting the power amplifier of
the base station to the
RF In
port of the Cell Master using a coupler or attenu-
ator.
CAUTION: The maximum power without damage is +43 dBm on the RF In
port, and +23 dBm on the RF Out port. To prevent damage, use a coupler or
high power attenuator.
The following keys are available in GSM mode:
FREQ/DIST Press the FREQ/DIST key to set and change frequencies for the GSM measure-
ments. The Cell Master must be configured to tune to the frequency of the base
station.
q
Center
– Enter the center frequency of the channel. The Cell Master will au-
tomatically adjust the span for GSM signal.
q
Signal Standard
– Select the signal standard and channel (Chapter 3, page
3-14).
NOTE: Refer to the chapter on Handheld Software Tools for information on cre-
ating and storing custom signal standards.
q
External Ref Freq
– Most base stations have a frequency reference available
on a BNC connector. Connect the Cell Master to the base station and enter
the external reference frequency. For accurate frequency measurements, it is
important to use an external frequency reference attached to the Cell Master
Ext Freq Ref
input.
As the Cell Master locks to the source,
Ext Ref Unlocked
may briefly flash on
the display. If this message stays on, check that the Cell Master is set to the
correct external frequency. If the message
External reference unavailable.
Using internal reference
displays, then there is no frequency reference on the
Ext Freq Ref
input.
14-1