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Quick Start Guide 1-11
ESG Family Signal Generators Getting Started
Setting Up a Digital Modulation in the GSM Format
Setting Up a Digital Modulation in the GSM Format
NOTE You must have an ESG-D or ESG-DP Series Signal Generator with Option UN8
to perform this procedure.
Using this procedure you will set up the signal generator to output a GMSK digitally
modulated signal in the GSM format with the following characteristics:
• carrier frequency set to 891 MHz
• power level set to −5 dBm
• timeslot 0 activated and configured as a Custom channel
• a fixed 4-bit repeating sequence selected as the data pattern for timeslot 0
• timeslot 7 activated and configured as a Normal channel
• 4 ones and 4 zeros selected as the data pattern for timeslot 7
Setting the Carrier Frequency
Setting the Power Level
1. Press Preset. This sets the signal generator to its factory-defined instrument
state.
2. Press Frequency. Frequency becomes the active function and the preset value for
frequency is displayed in the active entry area.
3. Enter 891 using the numeric
keypad and press the MHz
softkey.
The new carrier frequency (891.000 000 00 MHz) is
shown in both the FREQUENCY area and the active entry area
of the display.
1. Press Amplitude. Amplitude becomes the active function and the preset value for
amplitude is displayed in the active entry area.
2. Enter −5 using the numeric
keypad and press the dBm
softkey.
The new power level (-5.00 dBm) is shown in both the
AMPLITUDE area and the active entry area of the display.
qsg.book Page 11 Friday, September 22, 2000 3:13 PM