SMIQ Digital Standard GSM/EDGE
1125.5555.03 E-92.309
Fig. 2-198 Menu DIGITAL STD - GSM/EDGE - CLOCK..., SMIQ equipped with Modulation Coder
SMIQB20 and Data Generator SMIQB11
(CLOCK...) CLOCK SOURCE
Selection of clock source.
INT SMIQ uses internally generated clock signals.
EXT An external bit clock is fed in at connector
BIT CLOCK. The clock synthesizer on the
modulation coder is synchronized to this
clock.
The symbol rate has to be set with an
accuracy of ± 1 %.
The polarity, the trigger threshold and the
input resistance of the clock inputs can be
modified in menu DIGITAL MOD - EXT
INPUTS.
IEC/IEEE-bus
SOUR:GSM:CLOC:SOUR INT
DELAY
Setting the delay of generated modulation signal to an
external clock.
This can be used, for example, for synchronization with a
second unit to achieve time synchronization between the
modulation signals of the two units.
IEC/IEEE-bus
SOUR:GSM:CLOC:DEL 0.5
POWER RAMP
CONTROL...
Opens a window for setting the envelope control, especially for the rising and
falling ramp at the beginning and end of a slot.
Fig. 2-199 Menu DIGITAL STD - GSM/EDGE - POWER RAMP CONTROL... , SMIQ equipped with
Modulation Coder SMIQB20 and Data Generator SMIQB11
(POWER RAMP
CONTROL...)
SET DEFAULT
Resets the subsequent parameters to the factory-set
values.
IEC/IEEE-bus
:SOUR:GSM:PRAM:PRES
RAMP TIME
Input value for the rise and fall time of the envelope
at the beginning or end of a slot. The time is set in
units of symbol period.
IEC/IEEE-bus
SOUR:GSM:PRAM:TIME 2.5
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