Motorola R-2400 Operator's Manual page 32

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4.4.0 MONITOR OPERATION
4.4.I
SENS
MON
The Service Monitor is capable of
monitoring frequen-
cies
of 3 MHz
to 1
GHz^with
1.5
uV
sensitivity.' The
monitor
may be used
to
1
MHz with reduced sensitivity.
1. Connect the BNC antenna (TEKA -24A)
to
the
antenna connector located
in the RF
section.
2.
Set
the FUNCTION switch ro SENS MON.
3.
Select the
modulation type
using the
MODE
switch.
4.
Enter the frequency from the
keyboard
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5.
Adjust the
squelch and volume.
6.
Move the left cursor
tr
to
Devlo/oAM. Move
the
right
cursor tr
to
frequency
error. Listen to
re-
ceived
audio from the internal speaker and view
on
the
oscilloscope.
NOTE: The antenna input is fuse protected against
in-
advertent keyup
into the
antenna
input.
Consult
the
maintenance
portion
of the manual for
fuse
replacement.
In
either PWR MON or
SENS
MON
functions
the
BANDWIDTH WIDE/NARROW
switch
selects
the
IF
bandwidth. Narrow band
is + 15
KHz
modulation
acceptance used
for
most 2-way radio communication
systems and wide band
is +75 KHz modulation
accept-
ance used
for commercial FM
broadcast
monitoring.
FIGURE
4.3_TEST
SET-UP FOR
OFF-THE-AIR MONITORING
CAUTION:
Care should
be
taken to not
exceed
the
.5
watt
max. input level
of
the "Antenna Input".
4.4.I.I
SENS
MON WITH
SPECTRUM ANALYZER
(R-2400
only)
l.
Connect the BNC
antenna
to the "Antenna"
connec-
tor
located
in
the
RF
section.
2.
Set the
Function switch to "Anlzr
Sens
Mon".
3.
Adjust
the
Vertical and Horizontal Position controls
if
necessary (see 3.6.8).
4.
Ensure that "Vert Vernier"
is set
for
"Cal".
5.
Enter the RF frequency from the keyboard.
6. Adjust
the
squelch
and volume.
7. Adjust
for
desired dispersion
of
.01
Mhz/div
(see
3.6.3).
8. Adjust the RF
step attenuator
to
give the
desired
signal
level.
9.
Check
for
the
presence
of
images using the
Image
Hi/Lo
switch
(see
3.7
.2).
4.4.2 PWR MON
For high power
signal
monitoring (.5
to
L25
watts)
Connect
the radio under test antenna out to the RF
IN/OUT
connector
on the Service Monitor.
Set
the FUNCTION switch
to
PWR MON.
Enter the frequency from keyboard.
Move the right cursor to
PWR.
Key the radio under test and read output
power.
CAUTION: To prevent undue
stress
on the protected cir-
cuits
it
is advisable
to
always
switch the
system
to
the
power monitor before applying power in
excess
of
200
mw.
Additional protection
is also
obtained
by
making it
a
practice
not to
leave the step attenuator
in the 0
dB
position.
High-powered equipment
in the
1-30
MHz
range.,
which
have unusually fast
carrier rise times, may
damage the
service
monitor with repeated activation
of
the protect
circuit.
Ensure
the FUNCTION switch is in the "PWR
MON"
position (this
enables
the
protect circuit) before
RF power is applied to the equipment.
In
either monitor mode, the
displays
can be
selected
using
vertical cursors to the left of
each
LCD to
view
frequency, frequency error, modulation
level.,
distortion
and
power
when in the PWR
MON function for
AM,
FM
or CW
signals.
FIGURE 4-4_TEST
SET.UP FOR
POWER MEASUREMENT
l.
2.
3.
4.
5.
Imm
ANTENNA
[]mH
TRANSMITTER
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4-3