R&S FSH
Getting Started
Using the Spectrum Analyzer
Quick Start Guide 1309.6269.12 - 09
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The R&S FSH provides several methods to fill in input fields:
● directly with the number keys
● with the rotary knob
● with the cursor keys
While you can enter any number you want with the number keys, using the rotary knob
or the cursor keys is coupled to a certain step size in most cases.
If you use the rotary knob to change the attenuation, for example, the step size is 5 dB.
► Enter the attenuation you need.
Again, the R&S FSH shows the current attenuation level in the hardware settings
overview ("Att.:" caption).
2.1.2 Using the Preamplifier
The R&S FSH has an internal preamplifier to increase sensitivity. Depending on the
frequency, the gain of the amplifier is in the range from 15 to 20 dB and increases the
sensitivity by 10 to 15 dB.
In the signal path, the preamplifier comes after the RF attenuator and before the input
mixer.
► Press the AMPT key.
► Press the "RF Att/Amp/Imp" softkey.
► Select either the "Preamp On" or "Preamp Off" menu item.
The R&S FSH turns the preamplifier on or off.
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.
