DIGITAL MODULATION MODE
3-19
Storing a user-defined system
When a modulation system has been defined the setting can be stored in one of five non-volatile
stores. To do this, press the
[Store to User "n"]
key which causes the additional message
Store to
User:-
to be displayed. Enter a user number in the range 1 to 5 and follow by [enter]. Entering a
number outside this range causes the message
Error 50: Out of Range
to be displayed and the user
number must be re-entered. A stored system can be recalled from the
System Select
menu shown
in Fig. 3-11.
To select a preset modulation system, press
[Select System]
which displays a further menu (see
Fig. 3-11 below).
LOCAL
Cellular
User
Defined
Paging
PMR
Avionic
/ Sat.
Cordless
C2433
EXIT
Digital Modulation System Select
Current System: NADC
Modulation Type :
/4 DQPSK
Symbol Size
: 2 bits
Symbol Rate
: 24.3000 kHz
Filter Type
: Root Nyquist
Filter Alpha
: 0.35 - - - -
π
Fig. 3-11 Digital modulation: Modulation system select menu with NADC (D-AMPS) selected
Selecting
[Cellular], [Paging], [PMR], [Avionic/Sat.]
or
[Cordless]
displays a further menu
which allows predefined modulation systems to be selected (e.g. NADC, PDC, ERMES,
POCSAG). These menus are described below.
Selecting
[User Defined]
displays a further menu (see Fig. 3-12 below) which allows a
modulation system previously stored as a user defined system to be recalled by a single key press
of the
[USER1]
to
[USER5]
keys. Pressing
[EXIT]
returns to the
Digital Modulation System
Select
menu (Fig. 3-11).
LOCAL
USER1
USER3
USER4
USER5
USER2
C2447
EXIT
User Defined Systems Select
Current System: USER1
Modulation Type
:
/4 DQPSK
Symbol Size
: 2 bits
Symbol Rate
: 24.3000 kHz
Filter Type
: Root Nyquist
Filter Alpha
: 0.35
π
Fig. 3-12 Digital modulation: User defined systems select menu with USER1 selected