To set up pulse search
In this example you learn how to perform pulse search on a burst signal.
This example uses a signal, provided on the Signals Disk, which is a record
of the output of a keyed NADC radio transmission.
1. Load “MEAS_PI4.DAT” from the Signals Disk into the arbitrary source:
Perform steps 1, 2, and 3 in ‘’To prepare a digital demodulation
measurement.’’ For step 2, load the “MEAS_PI4.DAT” signal from the
Signals Disk instead of ‘’PI4DQPSK.DAT.’’
2. Select appropriate setup parameters:
Press [
Range] and select the optimum range.
Press [
Frequency
], [
center
], 5, [
MHz
]
Press [
span
], 100, [
kHz
].
Press [
Trigger
], [
trigger type
], [
internal source
], [
return
], [
ch1 delay
], 1, [
ms
].
If you don’t know how to select the optimum range, see ‘’To prepare a
digital demodulation measurement.’’
3. Select appropriate demodulation parameters:
Press [
Instrument Mode
], [
Digital Demodulation
] (with option AYH, press
[
Instrument Mode
], [
demod type
], [
Digital Demodulation
], [
Return].)
Press
[demodulation setup
], [
demod format
], [
standard setups
], [
NADC
].
4. Select pulse and result lengths for this particular signal:
Press [
Time
], [
search length
], 500, [
sym
]
Press [
result length
], 156, [
sym
].
5. Select measurement, display, and analysis features. For example, to view the
default displays for all four traces:
Press [
Display
], [
4 grids quad
]
6. The search length must be longer than result length and must include at least
one entire pulse. If the search length is long enough to include more than one
pulse, only the first pulse is demodulated. For additional details, see the
Digital Demodulation Concepts (Opt. AYA) chapter and see online help for
the [
pulse search] and [search length] softkeys.
Using Digital Demodulation (Opt. AYA)
8 - 6
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