To Demodulate A Two-Channel I/Q Signal - Agilent Technologies 89410A Operator's Manual

(Opt. AYH)

To demodulate a two-channel I/Q signal

Note
This measurement can only be performed with a 2-channel analyzer—you must
have option AY7 (option AY7 adds a second input channel).
If you have separate baseband I and Q signals available for your
measurement, you may demodulate them directly if you have a two-channel
analyzer. This type of demodulation preserves the original transmitted
relationship between the I and Q signals.
1.
Apply real I and Q signals to Channel 1 and Channel 2 respectively. If you have
an 89441A, be sure to use the inputs on the upper (IF) section of the analyzer.
2.
Select the special baseband receiver mode:
Press [
3.
Adjust the frequency span to encompass the signal with a span of at least 78
kHz.
4.
Make sure that time domain calibration is on under [
5.
Select identical parameters for both channels under the [
6.
Select identical parameters for both channels under the [
7.
Select identical parameters for both channels under the [
8.
Proceed with digital demodulation as shown previously.
For more information on this type of measurement see online help for the
[
input section (ch1 + j*ch2)
], [
Instrument Mode receiver
89410A:
[ input section (ch1 + j*ch2)
89441A:
[ IF section (ch1 + j*ch2)
] (89410A) or [
], then press:
].
].
System Utility
]
IF section (ch1 + j*ch2)
Using Video Demodulation
]
] key.
Range
] key.
Input
] key.
Trigger
(89441A) key.
9 - 15