Chapter 14 403
Real Time TDMA Formats
PHS Framed Modulation
PHS Framed Modulation
This example teaches you how to build framed real-time I/Q baseband generated PHS 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 > PHS > Data Format Pattern Framed.
Configuring the First Timeslot
1. Press Configure Timeslots > Timeslot Type > Custom.
2. Press
Configure Custom > FIX4.
3. Press
1010 > Enter > Return.
Configuring the Second Timeslot
1. Press Control Channel Dnlink Uplink.
2. Press
Timeslot Type > Custom.
3. Press
Configure Custom > Other Patterns > 4 1’s & 4 0’s.
4. Press
Return.
Generating the Baseband Signal
Press PHS Off On to On
This generates a PHS signal with an active downlink custom timeslot (#1) and an active uplink custom
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 PHS On and the PHS, 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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