
Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
181
User Manual 1321.1011.02 ─ 11
The R&S Spectrum Rider opens an entry box to set the RF attenuation. You can
set the attenuation from 0 dB to 40 dB in 5 dB steps.
To indicate a manual attenuation, the R&S Spectrum Rider puts a blue dot at the
"ATT" displays on the "Parameter View".
6.2.3.6
Using the Preamplifier
To increase the input sensitivity, the R&S FPH-B22 provides an integrated 20 dB pre-
amplifier after the input mixer.
In the default state of the R&S Spectrum Rider, the preamplifier is turned off. If you
want to measure signals with low powers, you can turn it on.
1. Press [AMPT] key.
2. Select "Att / Amp / Imp" softkey.
3. Enable or disable the checkbox to turn on or off the "Preamp" menu item.
The R&S Spectrum Rider turns the preamplifier on and off.
6.2.3.7
Setting the Input Impedance
In the default state, the input impedance is 50
Ω
.
The R&S Spectrum Rider can also handle 75
Ω
systems. The R&S Spectrum Rider
does not select a 75
Ω
RF input. Instead it selects a 75
Ω
matching pad connected at
the RF input. The 50/75
Ω
matching pad R&S RAZ is recommended for 75
Ω
matching
(see recommended accessories). The R&S Spectrum Rider automatically considers
the conversion factor when a value of 75
Ω
is set.
1. Press [AMPT] key.
2. Select "Att / Amp / Imp" softkey.
3. Select the impedance you need.
You can also use other matching pads (e.g. R&S RAM or R&S FSH-Z38) by acti-
vating transducer factors.
6.2.3.8
Using Transducer Factors
For more information, see
Chapter 6.4, "Using Transducer Factors"
6.2.4
Setting Bandwidths
The bandwidth menu contains all settings to set up filter bandwidths available in the
R&S Spectrum Rider. You can access it with the [BW] key.
Setting the Resolution Bandwidth
......................................................................... 182
................................................................................. 183
Configuring Spectrum Measurements
www.allice.de
Allice Messtechnik GmbH