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146 Chapter 7
Custom Real Time I/Q Baseband
Overview
Overview
Custom Real Time I/Q Baseband mode can produce a single carrier, but it can be modulated with real time
data that allows real time control over all of the parameters that affect the signal. The single carrier signal
that is produced can be modified by applying various data patterns, filters, symbol rates, modulation types,
and burst shapes.
To begin using the Custom Real Time I/Q Baseband mode, start by selecting from a set of predefined modes
(setups) or specify a setup by selecting a Data Pattern, Filter, Symbol Rate, Modulation Type, Burst Shape,
Configure Hardware, Phase Polarity, and whether Diff Data Encode is off or on.
Working with Predefined Setups (Modes)
When you select a predefined mode, default values for components of the setup (including the filter, symbol
rate, and modulation type) are automatically specified.
Selecting a Predefined Real Time Modulation Setup
The following steps select a predefined mode where filtering, symbol rate, and modulation type are defined
by the APCO 25 w/C4FM digital modulation standard, and return to the top-level custom modulation menu.
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband.
3. Press
More (1 of 3) > More (2 of 3) > Predefined Mode > APCO 25 w/C4FM.
4. Press
More (3 of 3).
Deselecting a Predefined Real Time Modulation Setup
To deselect any predefined mode that has been previously selected, and return to the top-level custom
modulation menu:
1. Press
Preset.
2. Press
Mode > Custom > Real Time I/Q Baseband.
3. Press
More (1 of 3) > More (2 of 3) > Predefined Mode > None.
4. Press
More (3 of 3).