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
.....
(+)
Adjust for
maximum
AM
socket through
AM
0%
Mod.
74
dB)
550kHz
V·
..
·(-)
T301 (AM NB)
wave
from on
RF
dummy antenna.
(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) readig on
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
Antenna socket
89
MHz
'V
..
(+)
L1 (FM
ANT
Coil) Adjust for
maximum
(FMRFDummy
(400
Hz
30%)
89 MHz
V
..
(-)
L4
(FM
ANT
Coil) reading on
AC
voltmeter
Fig. 19)
FM
"
107
MHz
107 MHz
V
..
(+)
cn
(FMANT
"
Trimmer)
(400
Hz
30%)
-
V
..
(-)
CT2
(FM
ANT
'f
.•••
~
Timmer)
eI
Repeat steps 4 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
stereo modulator output to
EXT
MOD
terminal
of
signal generator.
ePilot signal modulation
to
"10%".
2. FM signal generator
............
eFrequency approximately 100 MHz/Output level
to
"60-70
dB",
1-3
mV.
eModulation mode
to
"FM".
CIRCUIT
SIGNAL
FREQUENCY AC
ADJUSTMENT
REMARKS
GENRATOR
COUNTER
VOLTMETER
High side thru,
PILOT
89
MHz
100
kO
to
test
--
VR2
Adjust
for
76.00
kHz±50
Hz
readign
on
(0%
Mod, 80 dB)
pointV
Negative
(Pilot) frequency counter.
sidetoV
89 MHz
Make
adjustment so
that
when the
antenna
SEPARATION
(400 Hz,
30%
Mod,
i
..
LCh
(+)
VR1
input
is sUbjected
to
L modulation (or R
...Rch
(+)
80
dB)
...
(-)
(Separation) modulation.) R channel output
(or
L
channel output)
becomes
minimum.
• AZIMUTH ALIGNMENT
TAPE
AC
AC
ADJUSTMENT
REMARKS
VOL
TMETERG)
VOLTMETER@
Playback the azimuth tape.
Across headset
Across headset
V
..
Lch
(+)
Adjust for
same
reading
on
AC
V
..
Rch
(+)
voltmeterG)
and
@.
v··(-)
• FM STEREO ALIGNMENT
(3)
(2)
(1
)
(6)
'-'
---'-,-------
• DC BALANCE NB ALIGNMENT
(5)
(4)
4. Set volume 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)
Adjust for
maximum
AM
Earth
.....
(-)
30%
Mod.
interference.
(onl
V
..
(-)
T303(AM
2nd
1FT)
output.
at
400
Hz
about 600 kHz)
AM IF ALIGNMENT
AM
RF
ALIGNMENT
1. Set power switchto 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 Adjust for
1.2±0.05
V
applied
V·,·(-)
(AMOSCCoil)
readig on
DC
voltmeter
AM
Disconnect
No
signal
1610kHz
V
..
·(+)
CT302
Adjust for
7.8±0.1
V
applied
V···(-)
(AM
OSC
Tr.immer)
reading on
DC
voltmeter
Repeat steps (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)
Repeat steps (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 side thru.
Connect vert.
0.0011JF
to
test
10.7MHz
Point ofnon-
amp.
of
scope
to
Adjust for maximum
FM
point
~
Negative SWP.
interference.
(onl
testpointV
T1
(FM 1st
1FT)
amplitude.
side to test pointV.
about 90 MHz) Negative side
to
(Refer
to
Fig. 16)
testpointV
FM
"
"
"
"
T3
(FM 2nd
1FT)
Adjust for maximum
amplitude.
(Refer to Fig. 17)
FM ALIGNMENT
~
[l]
[[]
To Next Page
Loading...
