Realistic TM-1001 - FM RF AND IF ALIGNMENT

FM
RF
AND IF ALIGNMENT
For
,ã.uro¡:*o*
r¡llc'deë,
Êhe icr¡¡sst
frequency
cf
f M
tuning range rhoultl not be
below
87.5
MHz,
12Sr?
tt12,5S¿)
Zr¿
=
Sttì
{?Sf¿}
50s¿
i75n)
Zout -
3004
{bala¡rcecl}
1 50fì
FM
Durrrmy
Antenna
to
300Q
antenna
terminal
of
Tuner:
"
Fis.2
FM
DUMMY
ANTENNA
B
Y.U/
db
Y¿//
Signal
generator
output
should
be no higher than necessary
to
obtain
an output reading,
Set Selector switch to
FM,
Signal Generator devìation;
75 kHz
NOTE:
Be sure to
disconnect
FM
line cord
antenna and
NARROW B/ïVlDTH
& AUTO.M TUNING
buttons should be
in the
"out"
position
during
alignment,
STEP
SIGNAL
GENERATCIB
COUPLING
SIGNAL
GENERATOB
FREOUENCY
TUNER
DIAL
SETTING
INDICATOR
ADJUSTMENÏ
Refer
Fig,4
REMARKS
1
Connect to FM
Antenna
Ter:mi-
nal
through
FM Dummy
Antenna
{300ç¿)
Fis,
2
No Signal
(on
or about
90 MHz)
DC
Voltmeter
connected to
Pin
33
& 34
L202
(Discriminator)
Adjust for
0V
reading on
DC Voltmeter
z Sarne
as
Step 1
90 MHz
(400
H¿, Mod,)
90 MHz
AC
Voltmeter
connected to
OUTFUT
jack
LI
04
(FM
OSC Coil)
L1 01
(FM
ANT
coìl)
'
L102, L103
(l'M
RF
Goíl)
Adiust
for
maximum
reading
on
AC Voltmeter
TC1
04
(FM
OSCTrim-
mer)
TCl
01
{FM
ANT Trírn-
mer)
TC102,
TC103
{FM
BF
Trim.
mer)
J
Sanre
as
S'rep
1
106
MH¿
{400
Hz, Mocl.}
106
MHz
Same
as
Step
2
\l
Adiust for
maxirnum
retding
steps ? & 3
improvcmenl
is
porsible.
$ani* *e
Step
f
9t
MHz
{40û
1-t:,
il.4od,}
90
L,4Hz
Same
as
Step
2
T2o1
(FM
rFT)
Adjust
for
maximunt
reading
q
Særæ er
$tep
1
CI8
ffiH¿
{4tû
È*4,
içlod.}
98 MHz
Distortion
Meter
connected
to
QUTPUT
jacl<
1zCI3
Adiust for
minimum
dístor.tion
fr
Sex'¡s
æs $*{s,
'l
û8lWHz
{4*0
l"*¿,
lMori.}
98 Mllz
Tunerls
TUNINÛ
Metor
VR2O1
Adjust for
7070
reading of'
full
scale with input
of
'l
rnV
?
$ac*e
as
8t*r¡
1
98,Ì?1il¡
{4ût
l*z &¡jod,}
98 ffillr
{Press
MUT*NG
Flt4
svvitchl
Oscilloscope
ccnnected to
OU"[PUT
iack
VB2O2
Adjust
so output
just
appears
with
an input
sÌgnal
Ievel
of
B
¡rV,
fu,