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\-
\_-
NOTE:
Shaded
area
data entry)
FIGURE
3.3_RF
SECTION CLOSEUP
NOTE: There
are
two memory positions
dedicated to the
A
frequency
and B
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
presstrtr.
The first "RE-
SET"
always recalls
the previously stored number
and
returns the cursor
to the first
digit
tr tr
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. Only 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
.
I
uV to
200uV
range.
CAUTION:
Do not apply RF
power when
unit
is
on
"OFF"
or "STANDBY"
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 l.5uV sensitivity.
The
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
200uV
to
lV
RMS is output
from
the
BNC connector
when
in the
"Hi
Gen"
(hi
gen-
erate) mode.
This connector is fuse
(P/N
6580377
A6l)
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
"HI
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 RF 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 the 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
ener gized.
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.
Press
Press
Numeric Program
Key
Key
1950
Display
Comment
Select
"Tone Remote"
Modulation
Code
iiilfi:l75
Hz
Old High Guard
Tone
Leave
At
217
5 Hz
:i:;iii:tititii!;ii
,,:il,:,ll|750
Hz
Old Function Tone
195,0,H2
indicates flashing cursor. (point of
fr;
t""J
E
\.-
3-7
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