To Perform Am Demodulation - Agilent Technologies 89410A Operator's Manual

Demodulating an Analog Signal

To perform AM demodulation

The following procedure demonstrates demodulation using files on the
signals disk that you load into the analyzer's data registers and use as
arbitrary source signals. The sample signal is a 5 MHz carrier that is
amplitude modulated with a sine wave.
1.
Initialize the analyzer:
Press [ ], [
Instrument Mode
89410A: [
input section (0-10 MHz)
89441A: [
RF section (0-10 MHz)
Press [ ].
Preset
2.
Load the source signal file AMSIG.DAT into data register D1:
Insert the Signals Disk in the analyzer's disk drive.
Press [ ], [
Save/Recall
Press [ ] (bottom softkey), [
Return
Rotate the knob until the file AMSIG.DAT is highlighted.
Press [ ], [
recall trace from file into D1
3.
Connect the SOURCE output to the channel 1 INPUT.
4.
Turn on the source and select arbitrary signal D1 (25 kHz sine modulating
5 MHz):
Press [ ], [
Source source on
5.
Set the frequency span:
Press [ ], [
Frequency span
The display should now appear as shown below.
Spectrum of the AM signal.
1-2
], then press:
receiver
].
].
], [ ] to select the internal disk drive.
default disk internal disk
]to display the files on the disk.
catalog on
], [ ].
enter
], [ ], [
source type arbitrary
], 500, [ ].
kHz
]