Modulation Analysis
R&S
®
Cable Rider ZPH
290
User Manual 1321.0950.02 ─ 07
2 = No burst detected as the burst period is too short
3 = No burst detected as the burst interval is too short
4 = Burst detected as the signal level is above threshold point, burst period and time interval between burst
is long enough
When the burst is detected, the R&S Cable Rider ZPH tries to demodulate the signal
based on the demodulation parameters that you have set and display the results.
1. Select the "Demod Parameters " softkey.
The R&S Cable Rider ZPH opens a submenu that contains the demodulation
parameters.
2. Select the "Burst Processing" to activate the burst processing of the measuring sig-
nal.
The R&S Cable Rider ZPH looks for probable bursts in the capture buffer and
demodulates the signal.
Alternatively, select the "Burst Processing" on the
Parameter View
to activate the
burst processing of the measuring signal.
When the burst processing is activated, the R&S Cable Rider ZPH changes the
font color of the "Burst Processing" from white to blue.
Selecting a standard
Two measuring standards are available for FSK modulation with the following modula-
tion parameters:
Measuring standards
Filter characteristics
Symbol rate, Number of sym-
bols
Bluetooth LE
Gaussian filter, BT 0.5
1 Mhz, 400 symbols
Tire pressure
No filter
18.9 kHz, 500 symbols
1. Select the "Standard" softkey to open the measurement menu.
The R&S Cable Rider ZPH opens a submenu that contains the measurement
standards.
2. Select the required standard.
● "Bluetooth LE" - Measurements on bluetooth low energy devices
● "Tire Pressure" - Measurements on devices that check the tire pressure of cars
● "Off" - Measurements on other signals
12.2.2
Frequency Configuration
For proper demodulation of signals, the carrier frequency of the modulation signal
should be set correctly on the R&S Cable Rider ZPH. If carrier frequency is unknown, a
search can be performed on the frequency spectrum supported by the R&S Cable
Rider ZPH and zoom into the area where the carrier maybe located.
For more information frequency configuration, see
Chapter 8.1.1, "Measuring Basic
Signal Characteristics"
,
on page 167,
Chapter 8.1.2, "Measuring the Channel Power of
Digital Demodulation
