17
Tel: 886.2.2175 2930 Email: [email protected]
www.salukitec.com
4) Optimize the test result. Lower the RWB to 100kHz.
Press
【
BW/SWP
】
, [Res BW Auto Man], input 100[Hz]
Then the 2 signals are clearly shown in screen as shown in figure below
Fig 4-4: 100Hz RBW Trace
4.3.2.
Resolving Signals of Different Amplitudes
To resolve two signals of different amplitudes, the resolution bandwidth must be equal to or less than the frequency interval of the two
signals (same as resolving two signals of equal amplitude). But the maximum resolution bandwidth for resolving two signals with different
amplitudes mainly depends on the squareness factor of IF filters other than the bandwidth 3dB.
Squareness factor is defined as the ratio of 60dB bandwidth to 3dB bandwidth of the intermediate frequency filter, as shown in Figure
below.
Figure 4-5 Schematic of Bandwidth and Squareness Factor
Example
Take resolving two signals of different amplitudes with frequency difference of 50 kHz and amplitude drop of 40dB as an example to
explain the testing steps:
