OPTION 005 GMSK Bt 0.3
Annex A-18
Modulation ON/OFF
Pressing of the [MOD ON-OFF] key underneath the display will enable or disable the
GMSK modulation. When modulation is disabled the generator reverts to normal mode and the
GMSK module is bypassed.
External clock/internal data
The internal data generator can be used with an external clock with the same format clock
as described under 'External data/clock operation'. To select an external clock press
[Int/Ext Bit Clk] on the GMSK Control Menu (see Fig. A-9).
Notes...
In order to operate from an external bit clock, the configuration control (see
'Configuration control' above) must be set to either stand alone or slave mode. In master
mode a bit clock output is generated on the CLOCK connector.
If external clock is selected but not applied, no error message is displayed.
DATA EDITOR
The data in a slot, frame, multiframe or superframe can be edited with the editor. To edit
data select [Edit Int Data] on the GMSK Control Menu in Fig. A-9. The operating principle of
the editor is similar whichever data (slot, frame, multiframe or superframe) is being edited. The
data is displayed in the same format as shown under 'Internal Data Selection'. If a slot is being
edited the data is displayed as shown in Fig. A-15. Having selected the data to be edited pressing
the [EDIT] key will result in the display shown in Fig. A-16. A cursor box will appear in the
position which is to be edited. Selecting [Set Bit to 0] or [Set Bit to 1] will enter a 0 or 1 at that
point and the cursor will then automatically increment to the next bit. The cursor position can be
moved by selecting [Bit Number] followed by a one to three digit number then pressing the
[enter] key. [Next Bit], [Previous Bit] can be used to increment or decrement the cursor position.
FRAME
MULTI
FRAME
SUPER
FRAME
SLOT
LOCAL
EXIT EDIT
GMSK Internal Data Editor Select
C0351
Slot
Number
Next
Slot
Previous
Slot
Slot Number :
1--
000
11111100011111000101110001011
1000101110001111100000111000
1
00100101110000100010010111
1
11111111100011111111111110001
1111000101110001011111111111
000
Fig. A-15 Data editor with slot editing selected
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