Fm System - Racal Instruments 9081 Maintenance Manual

(2)
Select the top
frequency range and
tune
the
UJUT
to
240
MHz.
Check
that the
OUTPUT
switch
is
in
the
NORMAL
position.
(3)
Set the
OUTPUT
LEVEL switch
to
the
OdBm
position.
Check
that the
VERNIER
control
can
vary the
meter reading over
the
-lOdBm
to
+3dBm
range
.
(4)
Without changing
the
tuning repeat operation
(3)
on
the other
frequency
ranges
.
(5)
Select the
top
range again,
tune
to
362MHz,
and repeat operation
(4).
(6)
Disconnect
the
mill
ivoltmeter.
FM
System
5.9
Test
Equipment Required
Page 5-2
Table 5
Modulation Meter 9009
Item 3
Type
'N'
to
BNC
Adaptor
5.10
Procedure
(1)
Set:-
FA/\^DM switch
to
I
NT
METER
switch
to
FM/pM
MODULATION FREQUENCY
switch
to
IkHz
position.
PEAK DEVIATION
switch
to
100kHz
position.
(2)
Vary
the
MODULATION
LEVEL
control
and check
that the
UUT
meter
responds.
,
(3)
Connect
the
modulation meter
(set to
100kHz FM)
to
the
UUT 50Q
output socket, using
Type
'N'
to
BNC
adaptor.
(4)
Tune
the
UUT
to
300MHz
and
vary
the
MODULATION
LEVEL
control
until
the
9009 modulation meter
reads
80kHz
deviation.
(5)
Repeat
(4)
at
450MHz.
(6)
Disconnect
the
test
equipment
9081
&
9082 Vol.
2.
5-9