Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
125
User Manual 1321.1011.02 ─ 11
Defining the gain of the audio signal
The change of frequency of the audio signal is a constant change of frequency. It is
either one octave per 20 dB or one octave per 40 dB.
1. Select the "Tone Gain" menu item.
The R&S Spectrum Rider opens a submenu.
2. Select the gain setting you prefer.
Defining the volume of the audio signal
The R&S Spectrum Rider allows you to adjust the volume of the audio signal.
1. Select the "Tone Volume" menu item.
The R&S Spectrum Rider opens an input field to define the volume.
2. Define a volume you are comfortable with.
The volume is a percentage from 0% to 100% with 100% being the loudest.
6.1.2
Measuring the Channel Power of Continuously Modulated Signals
The channel power measurement selectively measures the power of modulated sig-
nals. Unlike a power meter that performs measurements over its entire frequency
range, the channel power measurement measures the power of a specific transmission
channel. Other signals in the frequency spectrum do not show in the results.
When measuring the spectrum within a channel, the R&S Spectrum Rider uses a reso-
lution bandwidth that is small compared to the channel bandwidth. It then determines
the total power of the channel by integrating the results on the trace. The R&S Spec-
trum Rider takes the following parameters into account:
●
display mode (absolute or relative)
●
detector
●
resolution bandwidth
That means that you can compare the result to the result that would have been
obtained from a thermal power meter. The small resolution bandwidth acts like a nar-
row channel filter and so prevents out-of-channel emissions from affecting the result.
1. Press [MEAS] key.
2. Select "Meas Mode" key.
The R&S Spectrum Rider opens a submenu to select the measurement mode.
3. Select the "Channel Power" menu item.
The R&S Spectrum Rider starts to measure the channel power.
4. By default, the 3GPP WCDMA standard is active. Two vertical lines show the chan-
nel bandwidth.
Performing Spectrum Measurements
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