Tektronix WCA200A, User Manual

Page: 178 / 454

Modulation Analysis (Demod Mode)
3- 52
WCA230A & WCA280A User Manual
Observes I/Q signal voltage change over time. When the modulation type
(
MEAS SETUP
→
Modulation Type...
) is FSK, GFSK, or P25 C4FM, it
displays frequency change over time. Figure 3--42 shows an example. The
main view shows I/Q voltage versus time graph where I and Q are indicated in
yellow and green, respectively, or shows frequency deviation versus time graph
for the FSK, GFSK, or P25 C4FM modulation. For the P25 C4FM modulation,
the main view also shows the modulation fidelity measurement results and the
waveforms with the red dots indicating the symbol points.
For the Meas Setup menu, refer to page 3--45.
For setting views, refer to page 3--193.
Main view: I/Q voltage versus Time
(I and Q are indicated in yellow and green,
respectively)
Main view: Frequency deviation versus Time
(FSK and GFSK modulation only)
Modulation fidelity
measurement results from the top:
G
RMS error magnitude
(normalized by the deviation)
G
Carrier frequency offset
G
Frequency deviation
G
Symbol length
Main view: Measurement results and
Frequency deviation versus Time
(P25 C4FM modulation only)
The red dots indicate the symbol points.
Figure 3- 42: IQ/Frequency versus time measurement
IQ/Frequency versus Time
Measurement