Chapter 14 409
Real Time TDMA Formats
TETRA Framed Modulation
TETRA Framed Modulation
This example teaches you how to build framed real-time I/Q baseband generated TETRA modulation for
testing receiver designs. The procedures in this section build on each other and are designed to be used
sequentially.
Activating Framed Data Format
1. Press Preset.
2. Press
Mode > Real Time TDMA > TETRA > Data Format Pattern Framed.
Configuring the First Timeslot
1. Press Configure Timeslots > Timeslot Type > Up Control 1.
2. Press
Configure Up Control 1 > Data > FIX4.
3. Press
1010 > Enter > Return > Return.
Configuring the Second Timeslot
1. Press Timeslot > 2 > Enter.
2. Press
Timeslot Type > Up Custom.
3. Press
Configure Up Custom > Other Patterns > 4 1’s & 4 0’s.
4. Press
Timeslot Off On to On > Return.
Generating the Baseband Signal
Press TETRA Off On to On.
This generates a TETRA signal with an active uplink control 1 timeslot (#1) and an active uplink custom
timeslot (#2). The signal generator may require several seconds to build the signal. During this time,
Baseband Reconfiguring appears on the display. After the reconfiguration is complete, the display
reads TETRA On and the TETRA, ENVLP, and I/Q annunciators appear. The signal is now modulating the
RF carrier.
The signal’s configuration data resides in volatile memory and is not recoverable after an instrument preset,
power cycle, or reconfigured signal generation.
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