Getting Started
R&S
®
Spectrum Rider FPH
78
User Manual 1321.1011.02 ─ 11
● Using rotary knob
While you can enter any number you want with the number keys, using the rotary
knob is coupled to a certain step size in most cases.
If you use the rotary knob to change the attenuation, i.e. the step size is 5 dB.
7. Enter the attenuation you need.
The R&S Spectrum Rider shows the current attenuation level in the "Parameter
View".
3.3.1.2
Using the Preamplifier
The R&S Spectrum Rider has an optional preamplifier (R&S FPH-B22, order number
1321.0680.02) to increase sensitivity. Depending on the frequency, the gain of the
amplifier is in the range from 15 dB to 20 dB and increases the sensitivity by 10 dB to
15 dB.
In the signal path, the preamplifier comes after the input protection circuit and before
the RF attenuator of the R&S Spectrum Rider to provide excellent sensitivity when the
preamplifier is switched on.
1. Press [AMPT] key.
2. Select "Att/Amp/Imp" softkey.
3. Enable or disable the "Preamp" checkbox to turn on or off the preamplifier of the
R&S Spectrum Rider.
The magnitude of amplification depends on the reference level. This coupling to the
reference level makes sure that the dynamic range is at an optimum.
Trying Out the Instrument
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