Chapter 14 401
Real Time TDMA Formats
DECT Framed Modulation
DECT Framed Modulation
This example teaches you how to build framed real-time I/Q baseband generated DECT 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 > DECT > Data Format Pattern Framed.
Configuring the First Timeslot
1. Press Configure Timeslots > Timeslot Type > Custom.
2. Press
Configure Custom > Other Patterns > 8 1’s & 8 0’s.
Configuring the Second Timeslot
1. Press Timeslot # > 1 > Enter.
2. Press
Timeslot Type > Traffic Bearer.
3. Press
Configure Traffic Bearer > B field > Other Patterns > 4 1’s & 4 0’s.
4. Press
Return > Timeslot Off On to On > Return.
Generating the Baseband Signal
Press DECT Off On to On.
This generates a DECT signal with an active custom timeslot (#0) and an active traffic bearer timeslot (#1).
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 DECT On
and the DECT, 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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