Analog Duplex System
Subject to Export Control, see Cover Page for details.
8-18
[Pre-Amp] Soft Key
The 3900 is equipped with an internal 15 dB broadband amplifier that affects the T/R and ANT
Input Ports. When Pre-Amp is ON, the 3900 has a typical noise figure of -9 dB, resulting in a
noise floor level around -140 dBm in the spectrum analyzer (RBW = 300 Hz) and around
-126 dBm for the Inband power meter (IF = 6.25 kHz). Use of the Pre-Amp feature dramatically
increases the sensitivity of the 3900.
When Pre-Amp is used, special attention is required; it is a broadband amplifier and could
lead to saturation or compression problems in the receiver chain if the signal of interest is
very low, but a strong out of band signal is present.
Harmonics and Spurious Configuration Tile
The Harmonics and Spurious Configuration Tile sets sweep and Pass/Fail parameters for harmonics
and spurious measurements. This Tile is only available when the Harmonics & Spurious Test Option
(390XOPT060) is installed in the Test Set.
Fig. 8-16 Analog Duplex - Harm & Spur Limits Configuration Tile
Spurious Start Freq
Sets the lower frequency at which Spurious measurement sweeps begin.
Spurious Stop Freq
Sets the upper frequency at which Spurious measurement sweeps stop.
Spurious Threshold Level
Sets the level at which Spurious measurements are triggered. The Test Set records
measurements of frequency spikes that exceed the defined threshold level.
2nd Harmonic Upper Limit
Sets upper limit value for 2nd Harmonic measurements.
3rd Harmonic Upper Limit
Sets upper limit value for 3rd Harmonic measurements.
Enabled/Disabled
Enables or disables defined limit.
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