DIGITAL MODULATION MODE
3-25
Selecting the modulation type
Pressing the
[Select Mod Type]
key displays the
Digital Modulation Type Selection
menu shown
in Fig. 3-22 which allows the modulation type to be set to QAM, PSK, FSK or GMSK.
LOCAL
QAM
Test
Tones
FSK
GMSK
PSK
C2434
EXIT
Digital Modulation Type Selection
Current Modulation Type: /4 DQPSK
π
Fig. 3-22 Digital modulation: Modulation type selection menu with
π/
4 DQPSK selected
Selecting
[QAM]
,
[PSK]
or
[FSK]
displays a further menu (see Fig. 3-23, 3-24 or 3-25
respectively below).
Pressing
[GMSK]
selects GMSK as the current modulation type.
Pressing
[Test Tones]
enters the Test Tones utility which is mainly used for diagnostic purposes
(see 'Test Tones utility' below).
Pressing
[EXIT]
returns to the
Digital Modulation System Menu
(Fig. 3-9).
For the detail on how data is mapped on the RF carrier see 'Digital data mapping' on
page 3-33 below.