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3
Using the Instrument
Generating Modulated Waveforms
from the front panel however, this table must be converted for
different applications. An example of the QPSK data entry table is
given in figure 3-24.
CW Control – can turn the carrier waveform on and off. Use the
carrier off position when directly driving vector generators.
CW Frequency – defines the frequency of the carrier waveform.
Using this PSK function, the shape of the carrier waveform is
always sine. CW frequency is programmable from 10 Hz to 50 MHz.
Symbol rate – programs the rate of which symbols step through.
The rates can be programmed from 1 symbol/s to 1e6 symbols/s.
Marker – defines an index point where the SYNC output generates
a synchronization pulse. The marker can be programmed within the
range of the symbol list.
Amplitude – defines the carrier amplitude level. The same level is
used throughout the instrument when you move from waveform
shape to another.
Offset – defines the offset level for the carrier waveforms. The
same level is used throughout the instrument when you move from
waveform shape to another.
Figure 3-23, QPSK Modulation Display Example
3-47
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