Press Press
Nu
meric
Program
Key Key Display Comment
1950
rr=l
~
B
B
Select "Tone R
emote"
Modulation
Code
2175
Hz
Old
High
Guard
T
one
Leave
At
2175 Hz
17
50Hz
Old
Function
Tone
195
0H
z
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 positi
ons
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
ca
ncel the
entire
entry
when partially compl
eted
pressi•·
..
~J
I
··~J-
The
first
"RE-
SET'
always reca
ll
s
the
previously stored
numb
er
and
returns the cursor to the
fi
rst digit.I•
..
··J
I•
...
•J
recalls the
old
numb
er and terminates the programming
mode.
Any
parameter
entered
completely
during
the
earlier
part
of
the
seque
n
ce
will retain
it
s new value.
On
ly the param-
eter
cur
rently being
entered
will revert
to
its previous
stat
e.
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).
Th
e
R-2400 will display
the
spectrum
of
the signal when
"An
lzr
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
uo
FF"
or
"STAND BY" mode.
The
unit
must
be powered
for
the protective circuitry to operate.
3.5.2 ANTENNA
A B
NC
connector
is
provided for
RF
input in the "Sens
Mon"
(sensitive monitor) mode with a 1.5uV sensitivity.
The
R-2400 will display the spectrum
of
the monitored
signal when the
"Anlzr
Sens M
on"
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
eig
ht
position r
ota
ry switch
attenuator
is provided,
calibrated in
10
dB
steps
for
contro
l
of
outgo
ing RF level
and
for
attenuation
of
received
or
monitored
signals.
3.5.4 RF VERNIER
A
potentiometer
type vernier
contro
l adjusts
the
RF
output level when gen
erat
ing an
RF
signal.
3.5.5 GEN ON/OFF
A special switch is avail
able
to
turn
off
the
RF
o
utput
generated by t
he
service monit
or
in
the
''
GEN"
(gener-
ate
)
or
"
HI
GEN"
(high
generate)
functions.
Th
is is
useful for testing
where
the
presence
or
absence
of
car-
rier
needs
to be selected
eas
ily, such as in 20
dB
quieting
checks.
The
generator
is always
reenab
led when the
"
FUN
CTI
ON
SWITCH
" is moved from a monitor func-
ti
on
to a
generate
function
or
when
the
microphone
Pu
sh-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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