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iU'IIiiiI.I·.l·~l'l'
MEASUREMENTS
AND
ADJUSTMENTS
• FM RF ALIGNMENT
• ALIGNMENT POINT
AM
SIGNAL
GENERATOR
FREQUENCY
OSCILLO
BAND DISPLAY
SCOPE
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING
Connect
to
antenna
550 kHz(400 Hz,
W
.....
(+)
Adjustfor
maximum
AM
socket through
AM
0%
Mod.
74
dB)
550kHz
V·
..
·(-)
T301 (AM NB)
wave
from on
RF
dummyantenna.
(Refer
to
Fig. 18)
oscilloscope.
-~
......
:::..~
Vi
I
FM
lsI
IO.7MHz
~
FM
OSC
I08MHz
~
FM
OSC
87.5MHz
@]-
AM
ANT
1500kHz
----,
cnol
,-
FM
SIGNAL
GENERATOR
FREQUENCY
DC
BAND
DISPLAY
VOLTMETER
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING
.-
~.
'-
Disconnect
No
signal
87.5 MHz
V
..
(+)
L5
Adjust
for
1.2±0.05
V
applied
V
..
(-)
(FM
OSC
Coil) readigon
DC
voltmeter.
FM Disconnect
No
signal
108
MHz
V
..
(+)
CT3
Adjust for
8±0.1
V
applied
V
..
·(-)
(FM
OSC
Trimmer) reading
on
DC
voltmeter.
Repeatsteps(1)
and (2).
FM
SIGNAL
GENERATOR
FREQUENCY
AC
BAND
DISPLAY
VOLTMETER
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING
Antennasocket
89
MHz
'V
..
(+)
L1 (FM
ANT
Coil) Adjustfor
maximum
(FMRFDummy
(400
Hz
30%)
89 MHz
V
..
(-)
L4
(FM
ANT
Coil) reading on
AC
voltmeter
Fig. 19)
FM
"
107
MHz
107MHz
V
..
(+)
cn
(FMANT
"
Trimmer)
(400
Hz
30%)
-
V
..
(-)
CT2
(FM
ANT
'f
.•••
~
Timmer)
eI
Repeatsteps4 and 5.
FM
SIGNAL
GENERATOR
FREQUENCY
DC
BAND
DISPLAY
VOLTMETER
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING (center
"0")
Antenna scoket 89
MHz
V
....
(+)
T3
Adjust
T3
for -0.05.-,..0.05 V
FM
(400 Hz,
30%
89 MHz
V··
..
(-)
(FM
1FT)
reading on
DC
voltmeter.
Mod,60dB)
Notes: 1. Stereo modulator
................
eConnect
stereomodulatoroutput to
EXT
MOD
terminal
of
signal generator.
ePilotsignal modulation
to
"10%".
2. FM signalgenerator
............
eFrequencyapproximately 100MHz/Outputlevel
to
"60-70
dB",
1-3
mV.
eModulation mode
to
"FM".
CIRCUIT
SIGNAL
FREQUENCY AC
ADJUSTMENT
REMARKS
GENRATOR
COUNTER
VOLTMETER
Highside thru,
PILOT
89
MHz
100
kO
to
test
--
VR2
Adjust
for
76.00
kHz±50
Hz
readign
on
(0%
Mod, 80dB)
pointV
Negative
(Pilot) frequencycounter.
sidetoV
89 MHz
Make
adjustmentso
that
when the
antenna
SEPARATION
(400 Hz,
30%
Mod,
i
..
LCh
(+)
VR1
input
issUbjected
to
L modulation (orR
...Rch
(+)
80
dB)
...
(-)
(Separation) modulation.) R channeloutput
(or
L
channel output)
becomes
minimum.
• AZIMUTH ALIGNMENT
TAPE
AC
AC
ADJUSTMENT
REMARKS
VOL
TMETERG)
VOLTMETER@
Playbackthe azimuth tape.
Across headset
Across headset
V
..
Lch
(+)
Adjustfor
same
reading
on
AC
V
..
Rch
(+)
voltmeterG)
and
@.
v··(-)
• FM STEREO ALIGNMENT
(3)
(2)
(1
)
(6)
'-'
---'-,-------
• DC BALANCE NB ALIGNMENT
(5)
(4)
4. Setvolume control
to
maximum.
5.
Set
band switch
to
AM, FM.
6.
Set
SENS
switch
to
DX.
SIGNAL
GENERATOR
or
FREQUENCY
INDICATOR
SWEEP
GENERATOR
DISPLAY
(ELECTRONICS
ADJUSTMENT
REMARKS
BAND
CONNCTIONS
I
FREQUENCY
SETTING
VOLTMETER
or
SCOPE)
AM~IF
ALIGNMENT
V
..
·....
(+)
450kHz
Point
of
non-
V···(+)
T302(AM
1st
1FT)
Adjustfor
maximum
AM
Earth
.....
(-)
30%
Mod.
interference.
(onl
V
..
(-)
T303(AM
2nd
1FT)
output.
at
400
Hz
about600 kHz)
AM IF ALIGNMENT
AM
RF
ALIGNMENT
1. Setpowerswitch to ON.
2.
Mute
switch
to
OFF.
3. Intcom switch
to
HS.
AM
SIGNAL
GENERATOR
FREQUENCY
DC
BAND DISPLAY
VOLTMETER
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING
Disconnect
No
signal
520 kHz
V·
..
(+)
L303 Adjustfor
1.2±0.05
V
applied
V·,·(-)
(AMOSCCoil)
readig on
DC
voltmeter
AM
Disconnect
No
signal
1610kHz
V
..
·(+)
CT302
Adjustfor
7.8±0.1
V
applied
V···(-)
(AM
OSC
Tr.immer)
reading on
DC
voltmeter
Repeatsteps (1) and (2).
AM
SIGNAL
GENERATOR
FREQUENCY
AC
BAND
DISPLAY
VOLTMETER
ADJUSTMENT
REMARKS
CONNECTIONS
FREQUENCY
SETTING
Connect
to
antenna
'V
..
(+)
L301 (AM
ANT
Coil)
Adjust for maximum
socket through
AM
550 kHz
550kHz
v
..
(-)
L304 (AM
ANT
Coil) reading on
RF dummyantenna.
AC
voltmeter
(Refer
to
Fig. 18)
CT301 (AM
ANT
AM
"
1500kHz
1500kHz
; ..
(+)
Trimmer)
...
(-)
CT303
(AM
ANT
"
Trimmer)
Repeatsteps (4) and (5).
AM NB ALIGNMENT
SIGNAL
GENERATOR
or
FREQUENCY
INDICATOR
SWEEP
GENERATOR DISPLAY
(ELECTRONICS
ADJUSTMENT
REMARKS
BAND
SETTING
VOLTMETER
CONNCTIONS FREQUENCY
or
SCOPE)
FM-IF ALIGNMENT
High sidethru.
Connectvert.
0.0011JF
to
test
10.7MHz
Point ofnon-
amp.
of
scope
to
Adjustfor maximum
FM
point
~
Negative SWP.
interference.
(onl
testpointV
T1
(FM 1st
1FT)
amplitude.
side to testpointV.
about90 MHz) Negativeside
to
(Refer
to
Fig. 16)
testpointV
FM
"
"
"
"
T3
(FM 2nd
1FT)
Adjustfor maximum
amplitude.
(Refer to Fig. 17)
FM ALIGNMENT
~
[l]
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