Modulation Analysis
R&S
®
Spectrum Rider FPH
251
User Manual 1321.1011.02 ─ 11
a = Minimum required signal level
b = Time between bursts
1 = No burst detected as the signal level is below threshold point
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 Spectrum Rider tries to demodulate the signal
based on the demodulation parameters that you have set and display the results.
1. Select "Demod Parameters " softkey.
The R&S Spectrum Rider opens a submenu that contains the demodulation
parameters.
2. Select "Burst Processing" menu item to activate the burst processing of the mea-
suring signal.
The R&S Spectrum Rider looks for probable bursts in the capture buffer and
demodulates the signal.
Alternatively, select the "Burst Processing" item on the
to activate
the burst processing of the measuring signal.
When the burst processing is activated, the R&S Spectrum Rider 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 "Standard" softkey to open the measurement menu.
The R&S Spectrum Rider opens a submenu that contains the measurement stand-
ards.
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
10.2.2
Frequency Configuration
For proper demodulation of signals, the carrier frequency of the modulation signal
should be set correctly on the R&S Spectrum Rider. If carrier frequency is unknown, a
search can be performed on the frequency spectrum supported by the R&S Spectrum
Rider and zoom into the area where the carrier maybe located.
Digital Demodulation
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