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Be sure GENERATE is selected in the RF Zone
in the upper right section of display. Move cursor
to the Audio Zone and place the cursor in the
"Code:" field. Select Voice modulation using the
VOICE FRAME softkey.
When code VOICE FRAME is selected in the
Audio Zone (Figure 21-14), the analyzer allows
audio inputs to the modulator to be selected from
two sources:
External + microphone, or
1 kHz tone.
Controls for each modulating input consist of a
switch with values of Off and Continuous. Move
cursor to the appropriate switch field and turn the
modulating input on "~" or off "X" using the
softkeys.
The audio inputs also include a level control for
precisely setting the audio input to the modulator.
Use the keypad or TUNING knob to enter the de-
sired level. The level range varies depending on
whether the bandwidth (in the RF Zone) is set to
narrow or wide.
BW Setting
Narrow
0.00 to 9.95 kHz maximum,
in 0.01 kHz increments
Wide
00.0 to 99.5 kHz maximum,
in 0.1 kHz increments
In Generate mode, deviation control is available
in the Audio Zone consisting of a switch with
values of Off and Continuous, and a level control.
Move cursor to the switch field and turn
deviation on "~" or off "X" using the softkeys.
Use the keypad or TUNING knob to enter the de-
sired deviation. The deviation range varies
depending on whether the bandwidth (in the RF
Zone) is set to narrow or wide.
Audio Level Range
BW Setting
Narrow
0.00 to 5.00 kHz maximum, in
0.01 kHz increments
Wide
00.0 to 50.0 kHz maximum, in
0.10 kHz increments
The default deviation setting for Project 25 is
2.83 kHz.
21-9.2.3 Voice Frame Embedded Signaling
(Generate)
When the audio source is selected to Voice
Frame, a display table user selection is available
which provides access to the embedded signaling
information contained in voice frames. The
display
table
Figure 21-14.
The following information is
encoded by the Project 25:
Embedded Information
Link Control Field (LCF)
Network Access Code (NAC)
Low Speed Data(LSD)
Status Symbol
The LCF information is further decomposed to
allow entry of specific LCF data units. Encoding of
the following LCFs is supported from the user
interface:
Link Control Opcode Identifier
Group Voice Chan User
Unit to Unit Voice Chan User
Adaptive Power Control
271
Deviation Range
presentation
is
shown
Size (bits)
72
12
96
2
Value
(binary)
%000000
%000011
%001111
in
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