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FM Alignment Chart
!
Test Point
|
|
:
Instrument &
Dummy
Adjustment
—
,
Pree oo
Frequency
Input | Output)
ant
Dial Setting
|
point
|
runes
Terminal | Terminal
|
|
ened eee
ii
ae
Pe aia
eee ae eee Eee neem
em
Abies
1 ore f a r e r e e r
eae
ede
=
!
FM IF Sweep
FM-IF
ae Det. ioe
Pruning gang | T1
'Adjust for maxi-
|
|
Generator and
input
Output
| Output
fully coun-
| Core
imum gain with
!
|
oscilloscope or
(R7)
| (TP1)
probe
ter-clock-
ispecified marker
|
| FMIF
"A"
wise
|
(10.7 MHz)
generating
| (Lowest fre.)
|
Scope
:
TEM-IF
[FM Det. |
:
~ |DC level that |
|
input
output
T101
'Muting SW is
/(L3)
| (TP2)
turned ON and
1. | FM-AF
|b
és
|
'
'
'OFF should be
i
'equal to each other.
|
|
(See Fig. 1)
!
—s
wie
eee
fa
_
i=
—
a
ene
ce eee
:
=
|
With T102,
i
'Cure increase and
|
|
decrease in size.
Cc
'i
fe
i
=
|
+102
'Adjust for maxi-
|
|
|
|
mum gain and
|
|
linearlity when
|
|
decreasing in size.
:
(See Fig. 2- b)
amare
Ae
eI
LO
acer
ee —
se
See ee ee
haut
EM SSG 87MHz
Output
| Generator | TuningGang)
L4
Adjust for
|
|
| (400Hz 22.5 KHz
pe
Terminal|
Output
— fully coun-
|
'maximum gain.
|
| Deviation) and
Probe
ter-clock-
|
FM
VTVM
"B"
| wise
|
2 — Oscil
|
|
(Lowest fre.)
}_—_}
__{_|ttewen
im _—_}
—__
|
baal
FM SSG 109MHz
/Ant
| Output | Generator Tuning gang
C1
Adjust for
(400Hz,22.5KHz
| input
ter.
| output
| fully
maximum gain,
Deviation) and
probe ''B" | clockwise
VT VM
—
| (Highest fre.))
;
|
=
|
Repeat the above item 2-(a), (b) for minimum change,
_
_
|
FM SSG 90MHz
1 ate
Output
| Generator-| Tune to
/ 1
|Adjust for
|
(400Hz,22.5KHz
| input
Terminal}
output
signal
L2
max imum gain,
|
| FM
ing
Track-
Deviation) and
VTVM
probe
ee B"'
FM SSG 106MHz
(400Hz, 22.5KHz
Deviation) and
VT VM
Lz.
!
TI
|"
Ne SESS
ee
Repeat the above item 3- (a), -(b) for mi inimum 1 change.
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