Att; Lna - SAF 0.3-3 GHz Spectrum Compact User Manual

0.3-3 GHz SPECTRUM COMPACT (FW V5.2.6)
Entering the REF menu

2.7.2 ATT

The ATT submenu allows selecting the internal attenuators. Current internal
attenuation is displayed at this menu and on the right side under the graph. Any
additional attenuation raises the noise floor but allows to input stronger signals (i.e.
raises the reference level). The internal attenuation can be adjusted in 5 dB steps by
using the buttons. The internal attenuation is 0 by default.
To exit the ATT submenu and return to the LEVEL menu, tap BACK.

2.7.3 LNA

Tapping the LNA button turns on and off the "Low Noise Amplification". LNA lowers
the noise floor and allows viewing very weak signals but the reference (overload) level
is considerably lowered.
When LNA is enabled, the LNA button is
the graph. LNA is disabled by default.
To get best results with the LNA, set internal attenuation ATT to zero and lower
reference level at the REF menu.
The REF menu
green and an indication is displayed under
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OPERATION