Chapter 4 195
Basic Digital Operation
Creating and Using Bit Files
Creating and Using Bit Files
This procedure teaches you how to use the Bit File Editor to create, edit, and store user-defined files
for data transmission within real-time I/Q baseband generated modulation. For this example, a user file is
defined within a custom digital communications format.
User files (user-defined data files) can be created on a remote computer and moved to the signal generator
for subsequent modification, or they can be created and modified using the signal generator’s Bit File
Editor.
These user files can then be applied as the transmitted data within a framed TDMA modulation, transmitted
as a continuous unframed data stream according to the protocol of the active TDMA format, transmitted as
the data for a custom modulation or real-time CDMA format, or for GPS applications. User files are not
available for signals generated by the dual ARB waveform generator.
A real-time digital modulation personality must be selected when desired real-time format appears in the
key press path.
NOTE For information on creating user-defined data files on a remote computer, see the
E4428C/38C ESG Signal Generator Programming Guide.
Creating a User File
Accessing the Table Editor
1. Press
Preset.
2. Press
Mode > desired real-time format > Data > User File > Create File.
This opens the Bit File Editor. The Bit File Editor contains three columns: Offset,
Binary Data, and Hex Data, as well as cursor position (Position) and file name (Name) indicators,
as shown in the following figure.
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