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3.8.4 MIC CONNECTOR
A
4-pin connector
is
provided
with microphone
bias and
PTT capability.
Depressing the
PTT button
on
the
micro-
phone
is
the
same
as
changing
the FUNCTION switch.
Function With PTT
Open
HI
GEN
GEN
PWR MON
SENS
MON
Function With PTT
Depressed
HI
GEN
GEN
GEN
HI
GEN
The mic
input contains
a
deviation limiter to limit
voice
modulation peaks
as
in
a
mobile radio.
3.8.5 EXT LEVEL
Control
of
the
microphone and other external
signal
generators
modulation
level
is
provided. When
in the
full
counter clockwise
position, the
source
is
disabled.
Mod-
ulation
levels are
viewed by
selecting
the
"DEVl%oAM"
display
on the left
LCD
and can also be viewed
on
the
modulation
scope.
3.8.6 CODE.SYNTHESIZER LEVEL
The
potentiometer controls
the
internal
code synthesizer
modulation level. When
in
the
full
counterclockwise
position, a minimum modulation level is reached. ON/
OFF control
is
provided
by the
modulation switch. Mod-
ulation
levels are
viewed by
selecting
the
"DEVl%oAl/'''
display on the
left LCD
and can be
viewed on the mod-
ulation
scope.
Also the
code synthesizer operates inde-
pendently of the function switch setting.
3.8.7 MODULATION SWITCH
A
3
position toggle switch controls the
code synthesizer
modulation
source.
1
.
Cont.-Allows
continuous
modulation (recycle)
sig-
nal
outputs. Sequential tone patterns
will
be
repeated
as
long
as
this switch is enabled.
2. oFF-Turns
off the modulation signal.
If
in the
DPL
or IDPL mode, returning the switch to the oFF from
continuous
or
burst produces
a
I34.4 Hz stop tone
burst
for
I20
ms.
3. Burst-For
PL, tone
A
and
tone
B
modes
the
output
is
present
for
as
long
as
the switch
is
held in the burst
position. For
A/B Var, A/B T&V,
and tone remote,
putting the switch in the Burst position
causes one
cycle
to
be
output. For tone remote, the
last
A
tone
is
output for
as
long
as
the switch is held in the
burst
position to simulate low guard tone.
In
the DPL
or IDPL
modulation mode the
burst
position
causes
continuous cycling of
the code
as
long
as
the switch
is
depressed.
When
the switch
is
released
the code completes the cycle
it
was
in
and
a
120
ms
burst
of
stop
tone (134.4 Hz) is
generated.
3.8"8 CODE SYNTHESIZER MODE SELECTION
The
code synthesizer
provides capability to
select any
of
the formats listed below.
Each
of
10
positions has
a
corresponding
LED
to indicate which mode
is selected.
Only when the modulation switch
is
toggled
away
from
the
off
position
will
the outputs be generated and
dis-
played in the
right LCD. The modulation switch
must
be
active
for
setting deviation
with the
code
synthesizer
level control. Positioning
of
the
selected mode
is
performed by
the
tr
vertical display cursor. As with
all cursor controls in the unit,,
or
audible feedback
tone
will verify
acceptance
of
a switch activation.
1. PL COUNT-Code
synthesizer outputs pro-
grammed
PRIVATE LINE
frequency,
displays
counted frequency
of incoming PL
tones
if in
either
monitor function.
2. Pl-Programrned
PRIVATE
LINE,
frequencies
to
1
kHz
3. DPl-Programmed DIGITAL
PRIVATE LINE
codes
are
output.
'ffi,W,w,;:taw,
W
&t
u,',',W;fu,
,'."'
:
:,
'
,, t:
::
,: 't::
t
l
,:
t:,l,ii::.
WY:'*,,'4W
;,,,;t.
:,,:t
::::t::
::::i::::::,:l::
ffi
,t{3,.#i;*,r,ii
ii,,,,":,.',',r",
trffi#ffiwLW*#*4
#;r*;d.w
ffi't#.,fu, ::,,w,t',''
",
:',.,,',,.';ffi
.,,|:,fi$,,
::ffi:ffigr,,,:,fu,911
FIGURE
3.7-CLOSEUP
OF MODULATION
SECTION
W,
3-10
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