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

Demodulating an Analog Signal

To perform PM demodulation

The following procedure demonstrates PM demodulation using a file on the
signals disk that you load into the analyzer's data registers and use as an
arbitrary source signal. The sample signal is a 5 MHz carrier that is phase
modulated with a triangle 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 PMSIG.DAT into data register D2:
Insert the Signals Disk in the analyzer's disk drive.
Press [ ], [
Save/Recall
Press [ ] (bottom softkey), [
Return
Rotate the knob until the file PMSIG.DAT is highlighted.
Press [ ], [
recall trace from file into D2
3.
Connect the SOURCE output to the channel 1 INPUT.
4.
Turn on the source and select arbitrary signal D2
(a 25 kHz triangle wave modulating a 5 MHz carrier):
Press [ ], [
Source source on
5.
Set the frequency span:
Press [ ], [
Frequency span
The display should now appear as shown below.
Spectrum of the phase modulated signal.
1-4
], 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 arb data reg
], 500, [ ].
kHz
], [ ], [ ], [ ].
D2 Return arbitrary