R&S FSH3 Using a Preamplifier
Using a Preamplifier
(only model 1145.5850.23)
The R&S FSH3 model 1145.5850.23 comes with an internal preamplifier for increasing sensitivity.
Depending on the frequency, this amplifier has 15 dB to 18 dB gain and increases sensitivity by 10 to
15 dB. It is fitted behind the RF attenuator before the input mixer.
¾ Press the SETUP key.
¾ Press the HARDWARE SETUP softkey.
¾ Use the Rotary knob or the Cursor keys to select
PREAMP... .
¾ Confirm the selection with the ENTER key or the
HARDWARE SETUP softkey.
The R&S FSH3 changes to the submenu for
preamplifier configuration. The selection bar indicates
the active setting.
¾ Use the Rotary knob or the Cursor keys to select the
setting you want (ON or OFF) and confirm the
selection by pressing the ENTER key.
If the preamplifier is switched on, its use is coupled to the reference level, thus ensuring at all times
optimum dynamic range of the R&S FSH3. The table below shows the positions of the RF attenuator
and the preamplifier as a function of the reference level.
Preamplifier
OFF
Preamplifier
ON
Ref Level
RF attenuation RF attenuation Preamplifier
≤ -25 dBm
0 dB 0 dB On
-24 dBm to –15 dBm 0 dB 10 dB On
-14 dBm to –10 dBm 0 dB 0 dB Off
-9 dBm to 0 dBm 10 dB 10 dB Off
1 dBm to 10 dBm 20 dB 20 dB Off
11 dBm to 20 dBm 30 dB 30 dB Off
The attenuator position can be queried at any time via the status display.
1145.5973.12 1.13 E-6
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