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FM LOOP
ASSEMBLY
19-0844
Fig.
8
and
Fig.
9
5.15
5.16
Test
Equipment Required
Multimeter
Mi
Ili
voltmeter
(HP.400E)
Audio
(1kHz)
Signal
Generator
Modulation Meter
Frequency Counter
Oscilloscope
Page 5-2 Table 5
Item
1
Item 8
Item
9
Item 3
Item 10
Item 16
Procedure
(1)
Set the
UUT
controls
as
follows:-
RANGE MHz
'256
-
512' range.
AM
switch
to
OFF
.
F/V\/JZ)M
switch
to
OFF.
PEAK
DEVIATION
switch
to
'lOOkHz'.
TUNE
switch
to
FAST.
OUTPUT
switch
to
NORMAL.
(2)
Tune
the
UUT
to
240MHz
(3)
Connect
the multimeter
to link
LK1
on
the
FM
loop
p.c.b.
(
19-0844,
Fig.
8)
and
(if
necessary) adjust the
core
of T1
on
the
p.c.b.
to
give a reading of +2.
5V
±0.
IV on
the multimeter.
(4)
Tune
the
UUT
to
362
MHz
and
adjust
T2 on
the
p.c.b.
to
give a
reading of
+2.5V ±0.1V
on
the multimeter.
(5)
Disconnect the multimeter from LK1
.
Monitor TP2 on
the
p.c.b
with a frequency counter and,
if
necessary, adjust
R50 on
the
p.c.b.
for
a reading
of
370kHz ±
5
/kHz.
(6)
Monitor TP3
using the oscilloscope.
Adjust
R145
until
the
waveform
is
as
shown
in
Fig. 5. 2.
9081
&
9082 Vol
.
2
5-14
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