To Demodulate A Non-Standard-Format Signal - Agilent Technologies 89410A Operator's Manual

Analyzing Digitally Demodulated Signals (Options AYA and AYH)

To demodulate a non-standard-format signal

This task uses a 16 QAM signal from the Signals Disk to teach you how to
demodulate a non-standard signal. The task uses digital demodulation. If
you want to perform this task using video demodulation, choose video
demodulation instead of digital demodulation in step 4. The Video
Demodulation Concepts (Opt. AYH) chapter explains how video
demodulation differs from digital demodulation.
1.
Initialize the analyzer:
Press [ ], [
Instrument Mode
89410A: [
input section (0-10 MHz)
89441A: [
RF section (0-10 MHz)
Press [ ].
Preset
Press [ ], [
Instrument Mode
2.
Load "16QAM.DAT" from the Signals Disk and play it through the arbitrary
source:
Perform steps 1, 2, and 3 in ''To prepare a digital demodulation
measurement'' in chapter 6.
from the Signals Disk instead of ''PI4DQPSK.DAT.''
3.
Select appropriate setup parameters:
Press [ ] and select the optimum range.
Range
Press [ ], [
Frequency center
Press [ ], 78, [
span kHz
Press [ ], [
Trigger trigger type
If you don't know how to select the optimum range, see ''To prepare a
digital demodulation measurement'' in chapter 6.
4.
Digitally demodulate the signal:
Press [
Instrument Mode
[ ], [
Instrument Mode demod type
10 - 2
], then press:
receiver
].
].
]
Vector
For step 2, load the "16QAM.DAT" signal
], 500, [ ]
kHz
].
], [ ], [
internal source return
], [ ] (with option AYH, press
Digital Demodulation
], [ ], [
Digital Demodulation Return]
], [ ], 150 [ ].
ch1 delay us
).