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3-6 AUDIO/MODULATION
SYNTHESIZER
The Audio zone located at the lowe
r right of the
screen is used to control the multi-purpose audio
synthesizer section of the unit. Signals generated
by the audio synthesizer are coupled internally to
the generator modulation input as well as to the
MOD OUT front panel connector.
In the GENERATE and DUPLEX modes, levels
entered in the Audio zone are shown as modu-
lation (either deviation or % AM). The com-
posite sum of modulation, only for those
modulation sources enabled, is displayed at the
top of the zone at the "Mod Sum:" location.
In the MONITOR and SWEEP GENERATE
modes, levels entered in the Audio zone are
shown as peak voltage values. The composite
sum of the voltage value (only for those modul-
ation sources enabled) is displayed at the top of
the zone at the "Audio Sum:" location.
Each of the following modulation signals has a
cursor field for entering it's desired level. Use the
keypad or TUNING knob to enter the desired
level.
An additional cursor field, adjacent to each level
entry, is used to enable or switch each selection
on and off using softkeys. This field is located at
the extreme right side of the zone. There are
three possible conditions for this softkey selec-
tion.
CONT activates continuous ON condition, or
continuous cycling if a sequence has been
selected. A ~ symbol is indicated at the extreme
right, adjacent to the level to indicate continuous
ON.
OFF switches off the modulation source. Off is
indicated by an "X" at the extreme right, adjacent
to the level.
BURST provides a single timed sequence of
modulation only for DTMF, TONE A, TONE B,
5/6 TONE, A/B SEQUENCE, GENERAL
SEQUENCE, and TONE REMOTE. A single
burst sequence is shown by the "*" symbol.
For DPL, select the START DISC TN (*) softkey
to produce a continuous disconnect tone. (Select
CONT then "*" softkeys to simulate a complete
DPL transmission with disconnect tone.)
The composite sum at the top of the zone will not
indicate the burst condition. To set the composite
level to include bursts of signaling, temporarily
select CONT for those modulation sources which
will be "burst" enabled.
3-6.1 Fixed 1 kHz
The analyzer has a fixed 1 kHz m
odulation
source, which can be selected independently from
the other audio synthesizers. Level control and
on-off selection previously described.
3-6.2 Synth
Level control and on-off selection are selectable
via softkey selection. The synthesizer function
encodes a broad selection of signaling formats,
which are softkey selected through the "Format
Sel:" field adjacent to "Syth:" level field. Use of
the more softkey accesses three different menu
levels for the following signaling formats.
PL
This softkey selects Motorola Private-Line tone
coded squelch signaling. This selection produces
two additional fields on the line below the
"Format Sel:" field (figure 3-10). The first allows
for softkey selection of either frequency or code
entry. The second is the value corresponding to
the frequency or code. Valid PL codes are found
in Appendix B. All frequency entries are
accepted, but only valid codes can be entered.
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