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Press
Press
Numeric
Program
Key
Key
Display
Comment
1950
rr=l
~
B
B
Select
"Tone Remote"
Modulation
Code
2175
Hz
Old
High
Guard
Tone
Leave
At 2175 Hz
1750Hz Old Function Tone
1950Hz
NOTE:
Shaded
area
indicates flashing
cursor.
(point
of
data entry)
~
~
RF
Vernier
Step
•
AF ln/0\Jt
FIGURE 3-3-RF
SECTION
CLOSEUP
NOTE: There are two
memory positions
dedicated to the A
frequency and
8
frequency. If
an operator changes
the A
frequency
or
B
frequency
in any
code
synthesizer
mode,
that
same
frequency
change
will
appear
in
all
modes.
3.4.4
CANCELLING ENTRIES
To
cancel
the entire entry
when partially
completed pressi•·
..
~J
I
··~J-
The first
"RE-
SET'
always recalls
the previously
stored number
and
returns the cursor to the fi
rst
digit.I• .. ··J
I•
...
•J
recalls
the
old
number
and terminates the programming mode. Any
parameter entered completely during the
earlier
part of
the
sequence
will retain
its
new value. On ly the param-
eter
currently
being entered will revert to
its
previous
state.
3.5.0
RF
SECTION
3.5.1
RF IN
/
OUT
CONNECTOR
A type
N
connector
is provided and allows the service
monitor to measure
the
RF output of
the
radio under
test in the
"Pwr
Mon" function (.5
to
125 watts). The
R-2400
will display
the spectrum of the
signal
when
"Anlzr
Pwr Mon" is used.
In
the
"Gen"
mode, the RF
output
from
the type N connector
will
be in the .1 uV
to
200u
V
range.
CAUTION:
Do
not apply RF power when unit is on
uoFF"
or
"STAND
BY"
mode.
The unit must be powered for
the
protective
circuitry to operate.
3.5.2 ANTENNA
A
BNC connector
is provided for RF input in the
"Sens
Mon" (sensitive monitor) mode with a 1.5uV sensitivity.
T
he
R-2400 will display the
spectrum
of the
monitored
signal when the "Anlzr Sens Mon"
function
is used. An
RF
signal
in
the range of 200u V to
1
V RMS is
output
from the
BNC
connector
when in the "Hi
Gen"
(hi gen-
erate)
mode.
This
connector
is fuse
(PIN
6580377A61)
protected
against
inadvertently keying
the
radio under
test while
connected
to the
input.
The
fuse is inside this
connector
and is accessible by unscrewing the connector
from the front
using a hex
wrench.
If
the
unit
exhibits
the
symptoms
of no
"Hl
GEN"
output
and very poor
off-the-air
receive sensitivity,
this fuse may require
replacement.
3.5.3 STEP
ATTENUATOR
An
eight
position rotary
switch
attenuator is provided,
calibrated
in
10 dB steps
for
control
of outgoing
R
F
level
and for attenuation
of
received or
monitored
signals.
3.5.4 RF VERNIER
A potentiometer
type
vernier
control
adjusts
the RF
output level when
generating
an RF
signal.
3.5.5 GEN
ON/OFF
A
special
switch is
available to turn
off
the
RF output
generated by
t
he
service monitor
in the ''GEN"
(gener-
ate)
or
"
HI
GEN"
(high
generate) functions. This
is
useful
for
testing where the presence or absence of car-
rier needs
to
be selected
easily,
such as in
20
dB quieting
checks. The generator
is
always
reenabled
when
the
"FUNCTION
SWITCH"
is moved from a monitor func-
tion
to a
generate function or when the microphone
Push-to-Talk is
energized.
3.5.6
ATTEN NOT
ZERO
An
LED
illuminates as a reminder
that
the RF attenu-
ator control
is not in the zero position, and the receiver is
not at maximum sensitivity.
3-7
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