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SINTINOf
TH€
Fnll*s
c'YhIATUIVEFT
!t{TR0Dt,cTt()N
The
Dynaco
FM"5
is
lhe
culntination
of mr.rre
than
{i
years
of
Dynaco
design
research
r+,ith
the
ilvorved
goai
of
exemplary performance
under
a
rvide
range
of recxtption
conditions
at
rnodest
cost.
Its
compact
size
nonetlieless
provides
a
generolrs
la-vout
for casv
kit
cori:;tnrclion
ancl
outstanding
serviceability.
In
additjon.
an
t
xt:cpti,ural
cle-
gree
of flexibility
has
treen
desiqned
inr.o
this t_urrr:r
{or
future
contingerrcies.
-
The
availability
of an
auxiliary
high
level
input
tirrorrgh
the
tuner's
volume
control
enables
tape
pla-yback,
for
ex_
ample, with
just
a
power
ampiifier
and
speakers.
Alterna_
tively,
an
accessory
phono
preamtr)
module,
.l!I<x_lr:l
pPM-s,
will
be
offered
fr:r
the
I'M-5
so that
the
ALjX
1;csition
will
accomrnodate
a
magnei,ic
r:artridge
inJrut.
In
ih"
.lir-
tant
future,
if
a cxrmlratible
s.ysteltr
of
4.r:lr;lrrntrl
rnulti-
plexing
is
approved,
it
is
possible
th:rt
the
lrovror
suJrply
and
space
allocations
will
accornnlodatc
it.
:inrJ
thr,
rri,es_
sary a'-rdio
outputs
are
available.
The
primary
consideration
in
the
devekrirrletrt
of
cach
new
Dynaco
product
is
exceptional perf'orrnani;e.
T.he
lrM-5
delivers
this in
full
nrea|;ut"{r.
'I}rer
ticrilgn
consirtera_
tions
necessar-y
to
achieve
a
lrrr,lrriunr
t1u;rlit";
kil
lr,rrd
automatically
to
a distinctly
sulx.rioi"
firctor",
:r:;setribled
unit
as
well.
I'he determination
of the
best
IrM ltrrrer
design
for
maximum
listening
enjoyment
is
n<lt
onr.l which
c2lri
be
made
entirel.y
in
the laboratory,
nor
c:rn
it lxr
full-y
definerl
by
specifications.
Extensive
field
testing
is
a vilrl
nart of
tuner
design.
Reception
conclitions
vitr.y s()
gr.eutlr.
that
certain
characteristics
which
favor
recerrtrtrir
in
sj()rne
instances
nlay
prove
a
lrandir.ap
rrrrrler
rlifft,rent
eircurn_
stances,
Side by-side
listening
comlrarisons
of
the
FM_5
with
tuners
several
times
its
cost demonstratc
the
IrM_5's
ability
to reject
the
pc'rvasive
t-fi'ects
of iiiultipath
dis_
persion
on
strong
urban
signals,
as
well
as
to
clcarlv
receive
weak
or distant
signals
without
noise
or interfei_
ence.
A tuner
can, however,
onl-v
prccess
the
si6lurl
it.
receives
from its
antenna.
The
lrrogrer
anl.entra
is
ttrus
a
vital
adjunct
to
your
music
system.
A section
of
this
manual
gives
some
suggestions
in
this reganl,
but
cornpe_
tent Iocal
advice
which
takes
into
accourrt
ihe
part,ictilar
Iocation
of the
tuner
will
always
be
aclvantasr:ous.
Vanishingly
low
distortion
has
always
been
a hallrnark
of
any
product
bearing
the
Dynaco
name.
,fhe
I'M-5
establishes
new
standards,
not
only
for
tylrical
in-phase
stereo
measuremenls,
but for
signals
of
dissimilar pirase
characteristics
as
well.
Coupled
with
out,sLanding
phase
integrity
in
a solid
state
tuner,
this
yields
*:xen4,lary
results
with
any
of
the matrix-type
4-Dimensional
(some_
times
incorrectly
called
4-Charrnel)
broadcasl.ing,qysterns
now
proposed,
including
the
ingeniously
sinrptc
IIyNA_
QUAD'*
system
developed
by Dynaco.
Any
successful
high
performance
audio
kit
design
inust
concomitantly
deliver
unchanging
results
ovnr
extended
use.
This
also implies
assurance
that
the
standards
set
bv
the
factory
assembled
units
are
consistentiy,
rcproducibll
when
even
a novice
properly
assembles
the
kit.
The more
than
15
year
old
Dynaco
reputation
for
consistentlv
meet-
lng
conservative,
detailed
specifications
is
your
best
guar_
antee that,
the
FM-5
will
do
just
that.
The
two
fiberllass
etched
circuit
boards
and
the
front
end
assembly
twirictr
contain
all
of the active
circuitry)
have
been
cimpletely
tt:sted
and
aligned
as
a
nratched
set.
for
the
kit,
leaving
notlring
but
their
interconnec:tion
for
the
liuilcl'er.
Th;
excellent
specifications
of
ther
FM_5
art:
possible,
and
guaranteeable,
rrnit
to
unit,
lab
model
to
pioduction
kit,
because
of the
extraordinarv
unifornrity
which
etched
cirj
cuits
provide,
and
the
inherent
si,abilitv
of
the
circuit
confiElration.
The
capability
for
the
finest
perfornrrnce
is
of
little
value
if
it
cannot
be readil.y
utilized
in
norrnal
use"
'fhe
consummate
oJrerating
ease
of
the
IrM_jj
is
a
case
in
point.
You-
simply
Leke
your
h:rncl
off
the
tuning
knob
as
soon
ers
the
TtiNED
indicator
is
illuminated.
The
exclusive
nvnar.uun'-
circuit
automatically
fine_tules
thc
station.
A
stereo
broadcast
will
automatically
switch
the
tuner
to
stereo
reception,
and
light
the
STEREO
indiurtor
loo.
fhe
FM-i-l
actually
exceeds
its
own
IHI,. s;;ecifications
when
it
colnes
to
listenable
results.
The
IHIr
pror:erclure
for
determining
the
distortion
specification
of
a
tuner
allows
readjustrnent
of
the
s()urce
signal
for
the
lowest
measurable
distortion.
you
the
listener
cannot
rio
this.
In
the
past
-you
have
had
l.o
rely
on
the
uncertainty
of
"center
of
channel"
meter
s.ystell)s,
ot.
on
llre
even
less
;rrecise
signal
strength
maxima
inrlir:ations-
I'tre
certainty
.f the
rryNaruNe""
circuit
autom.tic:rlly
.lirninates
thesl
variables,
assuring
reception
with
the
lowr:st
possible
dis_
tortion.
The
oyNa,rul.tr,,"
logic
circuit
senses
ilr.
yr.""..rce
of
the rlesired
signal,
together
with
the
absence
of
noise,
befcrre
it
will
switch
on
the
audio.
Then
it
automatically
fine-tunes
to
the
exact
center
of
the
IrM
channel
(the
min_
imurn
distortion point)
in
either
mono
or stereo.
Such
pre_
cise
tuning
is
accomplished
faster
and
more
accurately
tiran
any
other
tuning
system.
A
clearly
audible
virtue
of this
design
is
the
total
elimi-
nation
of switching
transienls
in
tl.re
operation
of
the mut_
ing
function.
And
you
have
the
convenience
of interstation
muting
down
to
the
levels
of the
weakest
useable
signals_
in
the
vicinity
of
4 microvolts!
'Ihe
result
is
absolute
silence,
-<rr
the
station
in
correct
tune.
Only
the
tr'M_b
achieves
this
ultimate
goal
of
a tuner.
This rehned
muting
circuit
eliminates
the
possibility
of
damaging
speakers
oi
solid
state
amplifiers
as
a
result
of
the low'frequency
"thumps"
so
comnlon
in
the
past
with
raprd
dial
ma"ipu_
lation-.
Yet
so
sophisticated
is
it.s
operation
thut
selectivity
of
adjacent
channels
is
completely
unaffected.
In
urban
locations
where
the
FM-5's
extreme
sensitivitv
could
have
been
a handicap,
speciai
care
was
taken
in
thl
design
of
the
front
end
to
accommodate
extremely powerlul
signals
without
encroaching
on
adjacent
weakei
channels.
The IM-5's
suppression
of
spurious
responses (cross_
niodulation)
is notable
among
solid
state
tuners.
Generous
tolerance
of
overmodulation
(
an
al
l
-too-conrmon
trroadcast-
ing
fault)
yields
low
distortion
signals
in
instances
where
others
suffer.
Smooth
flywheel
action,
a
long
uniformiv
r.peceil
dial,
and the
most
accessible
and
easiest
to install
rlill
stringing
system
ever,
make
the
FM-5
a
joy
to
use,
and
a tr..eeze
to
construct.
Only
those
who
have
built nther
luners
with
similar
dials
can fully
appreciate
the
latter.
The
IF
section
utilizes
two
4-pole
cerarnic
filters
for
the
optimum
combination
of
alignment
accuracy
ancl
s&r-
bility,
phase
integrity
and
effecfive
seler:tivity.
.I'he
ir]eal
selectivity
curve
is
a
3-sided
rectangle,
rrn:tt:hievable
in
practice.
Of the sevcral
approa<:hcs
to this
gr.ral.
tlrc
corn-
promises
in
each rnust
be weigherl
in t.l-rc
lighi
of
other
criteria. The
[,'I\4-ir
denrands
:lrr
rrnrrsLr:rllr' high
riegrce
of
alignmeni
accrlracv
and
stabilitv to
;lssurc th:rl
prt,lligni,rl
circrrit
boards
conforrn
in
:rll
resper:ts
lo a
fullv
asscrnlrle<l
trtrit whcn
it h:rs
lrcen
aligrrctl
on rlrnrlrlctiorr.
'l'uxr.
thc
atlvettt
of DYNAQUAII""
and othcr sirrril;rr uuttrix-t.vpe
4-l)inrensional broadcasts
tlenrarrrls
nn rrrrrrsurrijv
ltigh rle-
gree
of
phast'
linearitv
for nt:rxirrrurrr
st'p:rlrriori
rintl low
rlistortion rt'lrrorlrrction-
Suclr t:h:rrac:t.tristi(fs
:il:j{}
Iea(l
nattrrallv
lo tx'ttcr
receJrtion
of ervcn
<.orrr,t'rrliorr:rl
slr.ruo
bloadr':rsls.
'l'lrt'st'
go:rls
lentl lo
corrfli<:t u,illr rlr"riLlrr
critcritr
wlri<rh
Ilrvor
tlrc
:rchieverncnt
of the' nro,*t
irrilrri,sr;ir,e
figurcs
for sclcctivilv
specifications.
Indr-'t'rl.
sornc of
tlrc rluotc<l
sclt't't
ivitv
figrtrcs
arr: of
rlubiorrs valirlilv_
Irrrprt'ssi,,,t,
Iig-
ur('s
(::ul
lxr
olrt:rinerl
if
plr,:rsc
lirrearitv
is
igrrorcrl.
'l.ht:
rull('nn:l
lx'corrrt's:t
rrrrrr.lr
rrrorr.sigrrifir,:rnt
i:rt,tor
lvlrcrt:
itrijact'nt
<:harrrrt'l sigrr:rls
lrc
possiblt,.
:urrl
lrltcrnlrlt,
t.hlrn-
nel isol,lrlion
is
irtrJrort:rnt.
Sensitivitv
thc nrost
clrrotcrl
ttrrrt'r spt'<'ifi<lrtiorr
is in
frrct of rrrinirnal
conc()rn for
trrost riscrs.
'l'lrt'
lf NI
5'.r sl_'cci-
fit':ttiort of
1.7,5 nricrovolts
r:lost'l.y
irpJrro:rr.lrt's
tlrt'rr<.ccirlcrl
tht.orclic:rl
lirnit
of sign:rl
strcngth,
lrnrl vet
rt,llrirrs
grcat
sl:rbilitv.
rrot:rblt'
sprrriotrs
r('sl)()lls(' rr..ir'<:liorr.
rrnrl t,xt.r'llr,nt
AM
r
mtrltip:rlh
)
rc
jt'clion.
'l'lrc
sltr'1r lirrrilirrii
< rrrve r'\1'rrr
lrlified
hv thc
50
db
signal
to noist'ratio
u.'itlr
t,irlr':t
I
microvolt
signtrl
is
of
firr
grctrtt'r
sigrrifir::rnrt
tlurrr tlrt,
IIII,'
sensitivity.
A signal
should
have
a
signal
to noise
ratio
of
at least
40 db
twhich occurs
at only
2 rnicrovolts)
to be
of acceptabie
lislening
quality.
At normal
signal
levels,
the
typical
signal
to noise
figure
is
6b dbl
Exceptional
filtering
of the
19
kHz multiplex
pilot
car-
rier, the
38
kFIz
multiplex
subcarrier
and of the
6Z kHz
S(lA
carriers
assufcis freedom
from
interference
beats with
tape
recorder
oscillators
when
recordins
off the
air.
More than
witlr
anv other
audio
rrrocluct,
FM
tuner
specifications
need to
be evaluate<l
wiih
a
sornewhat
jaun-
diccd
eye,
and
an aJrlrreciation
that
inrlividrrallv
irnpressive
fiqures
do
not
necessaril.v
yielrl
thc
best listcning
results
in
the re:rl
wollrl.
Fore'most
is the
lirlil;rtion
that nrost
tuners
itre
rlesignetl
to nreet
crileria
establisht'rl
trl'
measurentcnts
rnlrtlc
in
a
speciall-y
shielricrl
roonr.
Such r.csults
are not
ncr:css:trilv
transJrosable
to
-\'orrr
living
roorrr_
Neither
the
prcviotts
IrM-3
-l)ynatuner
rror
the
trl,{ 5
,*ore
based
on
shitrlded
roorn
evaluations.
'I'tre
l,'M,i:l
cstirblisho<l
an envi-
ablc rt'Jrtrtalion
for
outllerforrning
nlull(rli)us
tuners
of far
gre:rtel
cost
hltving
:r1tp:rrcntlv
bt'ttcr syrecificalions
on
l)al)cr'.
'I'he
lfM-5
is
:r lrreak
with
tho
kit rlesisn
lrtrilosophv
of
its
IrM-3
lrr{rdcccssor-
The
I,'l\1
j}
u,ls
dt signcd
frorn
the
.grorrnrl
rrJr to bc
wholl.v
self-aligncd
bv lhe tlrilder
on
com-
lrletion.
llec:rrrst-'
of that
rt'rrrgnizcrl
su(jc(_'ss,
I).vnlrco
thor-
orrghlv
prrrsrrt'rl
()v(,r
rniln.v
rronl.hs
the
lxrssibility
of a
sirrrilar
<lesisn using
transistors.
'l'[re
clurraclt'ristics
of solid
sllrtc
rkrvict's
prcclrrrkr
tlri:;
lpprca<.h.
'l'lius
the
FM-5
t'volvcrl
:ls :t
conccJ)t.
of highlv
sl.trble
Jxrrforrrr:rnr:t_'
which
<rrlrlrl
ltc honcrl
to
1rt'r[ct:tiorr
wlrt'n
flrclorr.:ilignerl:rs
a set
of
jl
rrr;rlclrctl
srrlr:rssr.rrrlrlir.s.
t.lrp;rlrlc of lx'irrg
lestcrl
as
a
frrllv
operation:rl
tuncr.
'I'htrs
rro
lrd
jrrstnrt'nt
of
anv nature
slrorrlrl
be rnarlc
short
of contltlttc
irligrunr:nt
facilities.
Solirl
statc rt'li:rtrilitv
rnakt's srrch
,arljrrstrrrcnt
trrrlikt'lv
for
tlrc life
of the tuner.
INSTALLATION
AND
OPERATING
INSTRUCTIONS
'lhe
highlv rt'fincrl
anrl rlistillcrl
cnginct'rirrs
of tlir' l,'N,l-ll
cotrrbincs thc
pcrforrrlrncc
of flrr rrrort'
cor;lly
lrn<l <rlrrplr.x
I,'lVI
nrrrltiplcx
trrners
with
th() olrcntting
t'rrst'
rrnrl sirrrplir:
it.y which
has
lxx'n
a I)vrurco
trlrrliliorr"
lixlr:rrrstivr.
t,ngi._
trct'ring
rt'st':rrr'h
h:rs rcpla<xrrl
neerlless
ltrl.lrrslntr,rrts,
(:or)
trols
anrl irtdic:rtors
with
arrtornnlerl funciiorriirg,
[r.,t,ing
thc listener
lo t'rrjo.y
thc results.
N<lrnurl
olxrration
k'aves
all i] switches
rkt;rrcsst'rl
to tht'
right.
Once the
powt'r
switch
is rotnlcrl
1o
lht:
tlesirt,rl
vol-
ume level,
yotr
neerl
only t.unc
trntil thc
'l'tlNltl)
irrrliczrtor
is illunrinaterl
trt
the
desired siation^
lt is;
as
sirrrrrle
as tlrrrt.
AC Line
Connection
The
tuner
is norrnally
wirerd
for the
[J.S. starrtlrrd
li0
volt,
60 Hz
A(l line.
Alternative
wiring
ro
at:r:onrnroti;rlr,
'
240 volt
olreration,
with
either
50
or
6() Hz.
is
rlcscriberrl
later in
the manual.
'Ihe
typical
A(l corurectiorr
rvill ire
io
a switched
outlet
on
the
control center
or :trrrpliiier.
'l'lrtrs
the tuner's
power
switch
(on
the volunre
control
)
rrur.y
be
left "on"
with the volume
control adjtrstctl
for
<rrnrpzrtibil-
ity with
other
sources.
The
AC outlet on tlt'
ira<:k
pancl
of the FM-5
is
controlled
by the front
parrel
lron,cr
srvitch.
Thus
if no
separate control
center
is needed
iir tlic
.qvstcrn,
the
power
amplifier may
be switched through
this outlet,
and the
FM.5
plugged
into the wall outlet.
4
,.
Antenna
Connections
.;
'l'hrcc
scrt'w
tcrrrrinals
nre
lrrovirlcrl
orr
tht. back
panel
,
for t'ithcr
i](X)
ohnr
b:rlltnccrl. or
72
olrrrr
lrnlxrilrnced
an-
''
tcrrna svstt'rns.
A twinlelrrl
folrlcrl
rlipolt' :rrrlcnnu
is sup-
lrlicd
with
thc
tuner
anrl
will srrflice
for;lll
btrt thc most
dilfi<'rrlt signal
:rn'rrs.
Il slrorrlrl Irc
t'onrrc<:tt'tl to
the two
irrrtcr tll(X)
ohrn
)
scr()u,
tcrrrrinuls.
A
.llter
scr:tion
of this
,
rrurnrurl will
givt'
r'ou suggt'stiorrs
I'or oiher
lrrtr:rrn;ts
if
con-
rl it
iorrs rt.rlrr irt' srrt.lr.
Output
Connections
A
pair
of shieltlecl
cables
is supplicd
u,ith
the
FM-b,
'l'hese
shoultl
be connectecl
frorn
the
AtlI)IO
OUT tuner
sockt'ts
to
the IrN,I
I\{PX,
IIADIO
or
'I'trNEIl
irrJruts
of
the srntrol
center or
;rnrplifier.
'Dhe
outJrut level
of the
FN{-I-r is
arljusted
bv the
front
1-llrnerl
volrrrrre
contnrl.
'lhe
rlorrrin:rl
output
level
at maxinrrrnt
setting
from
a fully
morirrlated signal
is
2 volts.
You
can :rlso
connect
the
.
tuner to
any
basic
power
artrplifier whi<,h
has
an irrput
sen-
sitivitS'
of lcss
tharr
f
volts
for
full
orrrl'rrt
The
TAPE
OU'I sockels also
providc
a
variable
out,
put
level which
is
adjustable by the frorrt
tianel
voliime
control. These may
be connected to
the
line
inputs nf
a tape recorder.
Auxiliary
Input
The
third
pair
of
audio
sockets
provides
an tnput
con_
nection
which
is
switched
on the
front
panel.
Ihis
signal
is
available
at
both
the
AUDIO
OIJT
and
TAPE
dUT
soclets.
This
input
provides
a nraxinrurn
of
2g
dB
gain
and is
controllable
by the
volume
control.
Off / Volume
Control
'fhe
power
switch,
which
also
eontrols
thr:
back
panel
AC outlet,
is
a
part
of
the
volunre
crrnlrol.
If
the
tuner
is
plugged
into
a switched
AC
outlet.
on the
control
centerr.
the tuner's
volume
control
will
likelv
l:e
lr,ft
irr
thc
upper
half
of its
ra'ge,
wl'rere-r
tl.re
ttr'er
level
wiil rrr,t.tr
tlrr:
l&el
of
other
inputs
to the
control
arriplifier.
Mono
/ Stereo
Switch
In the
MONO
position
all statiorrs
will
Lrc ht,;rrrl
rnorro
phonically,
and
the
slerco
inrlicrtor
will
nevt,r
li{ht.
This
position
may
provitle
greatttr
clitril.',,
in
morrr.rphorri<:
rurct,1r-
tion
of rery
weak
stureo
trroadcast,s.
Jn
the
middle
S'l'EItIlO
IrILTltR
switclr
;ro:;ilion,
higlr
frequcncy
seJr:rration
of sterco
broadt_-asts
is
i.r.rlrrr:r,rl,
or
blended,
to improve
tl'rc
sign:rl
1o noisc r:ttio
orr wt,:rk
sienro
signals.
In other
resJrr:cts,
tuner
opcrrirtion
is sirrrilar
to
lire
normal
S'fERI]O rrrodc.
The
normal
position
of
this switch
is
tlre cxtrerrre
rigiri.
STERIIO nrode.
'I'he
ttrncr switr:lrcs;
:rulorrurticaily
fronr
mono
to st.erco
operalion,
and lit{lrls
thc
S'l'lfRItO
inrli<:a-
tor whencver
the ttured
stntion
is
broar:l<llrsting
thc
ll) kHz
multiplex
stereo
lrilot
carricr sigrurl.
()rt
nrrr'
<x:c:lrsrions
the
slation
may forgct
lo
turn
off the
pilot
carricr
lvhcn
they
revert to rnotro
bro:rdcastiltg.
[n su<.h
:l cls(\,
vorr will re-
ceive
a mono
broadcust
r.'vr-'r-r
t.hough
the sterr'o
irrrlir:lrtor
is
lighted.
Without
the
prilot
carrier,
the
tuner rev(,rl.s
to
rrrolro
but
the
lowest
noise
will
tx:
obtained
in
thc
MON()
position.
Off / Mute
/
Dynatune
Switch
In
the
gflr
position
the
rnrrling
circuitrv
and
the
auto-
rnatic
oyNaruNr,;
circuitr-y
is
tkrfcltcd.
'l'his
perrnils
ex-
tremely
weak
signitls
to
bc
perccivcrl,
trs there
is
rro inler-
siation
noisc
suJrprerssion
(nruting).'l'unt'
for trurxilrrurn
vertical
mett:r
irrdicat.ion.'l'ht:'1'tlNltl)
liglrt
rvill
Ilickcr
on ver.y
weak signals
of
v:trving
strcngth.
lfor
thtr rcct,pt.iorr
of such
signals
it is
bcst
to opt:rirtc
in tlre
MONO nrtxlc.
The middle
switch
position
is
prefcrrerl
l'or
nrirnrrrl
oJter,
ation
with thc
highest
tuning
ilccurac.y.
1'hc rrrutirrg
cirilrit
elimin:rtes
all inierstation
noisr:.
When the
'l'tiNIlD
lisht
comes
on, let
go
of the
tuning
knob
anrl :;wit.ch
to thc
extreme right
nvNnruNn
position.
'I'hc
;rutorrr:r{.ic
t:ircrritry
will
then take
over
for
trrrecise
tuning of
the
centt,r
of thc
channel
for mininturn
distortion.
You may
prefer
to
leave
this
sw,itch
in
llrt_.
r)yNA.t.(JNr,l
position
most
of the
tirnc.
as this is
the
erisicst
rnr,llrorl
of
operation.
'fhe
proper
tuning
procedtrre
lrcrc
is
to
releasr:
the
tuning
knob as soon
ils the
TUNI'ID
light
inrlicatcs
the
desired
station. "FiddlinC"
back
and forth
on
the
dial is
not reconlmended
with
the switch
in this
position.
{or
it
may leave
it on the
"edge"
of the
correct.
zone.
In
strch
a
case the
automatic tuning
circuitry
nra-y
not
be
able to fully
correct
for lowest
distortion
receDtion.
AUX
/ FM
Switch
The normai
position
is
FM.
The
AIIX
position
selects
an
alternate
high
level
signal
source,
such
as
a tape
play_
bacl<
amplifier,
which
is
controlled
b-v
the
tuner,s
volume
control.
In
the
AUX input
mode,
the
tuner
should
be muted
(
off station
r
to
avoid
audio
signai
feecl-through.
The inclusion
of
this
switch
and
the
atlclitional
outDut
s<tckets
on
the
back
ltanel
also
provicle
contingency
for
future
flexibilitl'.
An
acces-qorv
plrono
prealnl)
stage,
Model
['PM-5,
will
be offerecl
for
the
FM_S,
so that
the
AUX
lrosition
will
acconrnrocl:ite
a rna.gnetic
cartridge
input.
I' th.
dista't
future,
if
a
s.vsternr
of
4-cha'n.l
nr'ltiplexi'g
is
a;rproved.
it
is
possible
t.hat
thr.sc
provisions
will
nccom_
nrorlate
it.
Signal
Strength
r\,leter
'I'h.
rrr.l.ar
circrrit
hrrs
bee'
conrgr.rrsrrt.rl
io
rrtx,rr:itr..l-\,
slr.w
chiirges
irr
sigrurl
strarrgrl'r
at :r very
few rnicrovolts.
as rvt'll
as
lhos;e
i'orelirr.tclv
powerfrrl
si{rurls
abovc
il0.(xx)
nricrovolls-
'l'his
cun
be of sigrrific:rnt
valrre
in rlt'tt'r.ri.ing
lirrtcnrr:r
oricnt:rlion,
or
possiblv
t.hrr
nt'crl
frlr
rrn
attcnuator
Ior
too st.rotrg
lr signal.
'l'lr.
.Jr.ratiorr
.f
this
'r<'rt'r
t'irc.ir.
is srrt:h
th:rt
rr.rrrr:rl
sig'al
I.r'ols
will
lll i.rlic.t.
v.r.v
sirrrilur
I.vr'rs
rrt'rrr
th.
<:t'nter
<tf
llrc lrrc'tcr
scaler,
r'r't,n
ihotrgh
lht,v
rrrrn,\,rrrv
ov(,r
a
*'irl.
rargc.
Su<rh signals
rl.
rrrt.
'.rlr'rllv
lrr.scrrl
r.ccp-
1i'n
liroLrlt'r's,
a.rl thc rrr.lt'r
is ilrr.rr
,,,,,,.,,,,,*.,,ru.
Its
cir-
.uit, hlrs
bce'
tlesigrrcrl
lo
lx' .r.s;t
r.clr.i'gful
wlrt,rr
it
c:rrr
lxr rrros{,
rrscl'ul.
Whilo
:r
r'ilxirrrurrr
lrr.l.r
i'rli.trti..
q,iil
sh.w
tlr.
J)rol)cr
tulring
zonc,
u,t'll
wit.hin
t.hc
I)y11;q1111rr'
"winriow".
it is
rxis-
silrlc
that
it rrrinutc
rerltrclion
frorrr
tlrt' rrurxirrrrrrr
rrrt.ter
inrli<:trlion
nr:r.v
bc obscrvt'rl
lrs lht' I)r,n:rirrnc
cir.rril tlrkt,s
o\'()r
()n
sigrurls
strong
enorrgh
t0
lrr:liv:rtc
it,
lrrrrl tlre rrruting
circrrit.
'I'hc
[)ynatune
<:irr:rrit
t'rrlrblcs
I'rtr
grt::rtcr
tunirrg
precision
tlurn rn:urrral
ltrning
with
artl rrrctcr
s1,slt.rn.
The
Tuned
and Stereo
Indicator
Lights
'I'hc
'l'tiNI.jl)
inrlic:rtor
lights
u'hcn
\,()u
:lro on
sl:rtion.
If tht-. stlrtion
is
brolrtlt':rstirrg
irr rrrrrltiplt,x
stcrco,
the
S'l'l.lIiEO liglrt
will
also
conre on
arr instant
Ialt,r.
As thc tuning
dial
approachcs
witlrin
80
kHz ol
lht,
slrr
tion's
irroa<lclsl
{reqrrenc.y,
the illrrrnin:rtiotr
of thc
'l'tJNl,ll)
lighl will
inrlic:rte'
that
the I)ynatune
r:ircrrit
clrrr
l:rkt,
ovt,r..
'I'his
will
"ltrck
on" that
signal
lor the
next
'r,5O
kHz
If
tht,
station
is
:rppro:tchrrl
fronr
tht: oJrlrositc'
rlirection,
thc
sanx,
l<rking
action
will
bc
observt'd
.in thc r()v(rrs('
rlirr'<'tiorr.
strrrlirrg
agairr
within
ll()
kllz
oi
thc
bro:rdcast
frerluenc.r'.
If thc
dial location
is nrorc
tl.r:rn
8() kllz
dist:rnt
frorrr
the
broad<:ast
frer;ucncv.
anrl the
I)vnatrrnc
su,itclr
is
diserr
flafled,
thc
signal
will
be rnutc'd.
1'o rcsunre
rece;rtion.
the
tuner will
have
to
bc re-tunecl
until
the't'UNItI)
liuht is
again illuminated.
Occ:isional
lack
of
stereo
scpzrration
rvlren
ihe
STEREO
indicator
is
lighted
is
possible
if thc
skrtion
ne[lected
to
turn
off its
l.c) kHz
stereo
pilot
when
broadcasling
nrono.
If either
of these.
two lights
flicker,
it indicates
exceed-
irrgl.v
low signal
strength
rbeiow
4
microvolts)
or
noise
interfercnere
spikes
of very
high intensit.y.
In
such
a case
rearljustment
of the
antertna
for
a better
signal may
be
possible.
Switching
the muting
switch
.'0fi"
may
also
prove
useful.
Tuning
a Statiurr
The nyNa'rtrNu'''
cil'r"lri
the muting circuii..
Ii
.r'eir
not use oYNeluxl. Wlirirr
well
past
the' exar't irt'r;rir
dial, sek:clilii'.','
:. !'
paired,
anri ilr, iit ;,1
the oppo,iilr"lir',."
r.,',
'lhr'siirrl,l,
.",,.
;'
..
eratel.!',
:llttl :,'!,
t.,t
il
ir.
;i,'/,r'
'i"
lights. ,\llorl
,',
r,
1.'i
i:irl
iri
,1,:
i...
i
ii
1.., ;liil,.:r1','
,tr'll{ llit,
'.
rr.
r
,t
',"!!
dial rapidl.,'. roir .r
iil ir,.:rr
i;,, r
not lighl
:rt :ril
Installing
Ytlur i
'U
ri
Ytltrr lrNI
.:r
il|rir.r,r
,
\t':
iiti;i.
1r,.1'
I
t()
1-r11;fi6l1'
\{.rriiiriri,,rt
i'\r
Ji t\till
(
i,jtjr,iri..,.
I
ti<tn.
'l'ht'
I,-ll-:r rrr;,, lit.
rr,r;ririlt
ri iti
.,i,
cal)irlt't. lllltl
jf
rlt,,
rrt'il.
it
l,'',..
lx.
:.i;rr r
,
,'t
,
',
I'}A'l'-4
lrt't':rttri'lifi,
ll ii , it,,,
i i.,itir ii,;,
r
r
,.,
or
-S('d 80() ;rrrrlririrtl.
;trlt',l;rli1,'
\'t'lriiit,r
i,,,:
i,,,;
Virltttl
for
lirt
,rr,
ri".
i
litll'
ilttttt'l
ilrotiitlu!!.
.rti
i1,r:{-..,(Ji! i'i,i
J,r.r,
lrl''niiiri'ir.1.rrlttrItfilji!'(,irrt|':,}iti:1|;.rili
A
sinlit'
i'('{:t:ll)riuirir''
iit{irii
l
;
;
',
,i'r
i.. r'.
..
pancl
tll) to ottc itn
lr iirir
i,
I
lr.
.:
rir:
,
ii.
shcll'flrrslr
rrttl'rl,.
'..',;,,!rr:,
,
..1,,j
i
r-rrLrr
rrrr-rr rlrlri
tl:r
:Jrrtrrltt
{ti
.,t..r,[],.
l:lj
are ttot
ttst'rl
iir
r,i.i('lt
ill!
t.Iil,
...
Irr
;,
.
i:',
vides
ftlr
"f:tt't,
tt1," t,:rli',,ir.i
,,
!
I
.l.
l
sttPltorlctl
itt llrt
lriurtl
it'
r
i,,
tr;
,, i
LtrR(.t;ll llilr{.
l{rr'' i rr
,
'I'ht'
l,rllrni'lri;
1rr
ir,i L.r1tl
tti.r!r,;r,
,
,
ti
,
fcaturt's {)f
jl)(,
l,'lrJ
ll
ur,rv
rri,J ..r,r
..
ir.'
1.r
;,
tcchnic:tlil
irrt'lirir'rl
lillrlr.r
i
I
to ,.rrrl: r: t.rrrl
of this lttitt'r.
'l'lt,r
rt'
,l{rl
inli,:r,.
:
.,i
.,,
liir'
r,
ignort,
tltis st.r'liorr.
Front
End
The
frrlnt
(,tl(l
(r)lr)llnst's
:t 1ilri.(l
r,i
r.'
,rii.rrl
i.r
;r11 [;'!r"f'
RF arnplifier willr
int.r:rst:ige ri,;iti'rl;, ttrrrirrll
1o
tltr-
l,-Fl'I'
mixer.
A transrstor trscillattrr
:,r.r;'1rlit':r
iirr lnirer
'I'hc
last
section of
thtr
four
g:tng
tiurin;1
('iiirit('itilr
t;-rirr.s
thcr
oscillator.
OircLlii
c()nstants
()f
th() oscillalon
lrnrl
rni::c"
circuits have
bexrn
a(ljust{)d
to
giv'r,-
nltif(irnt rii'l!i'iii1,,it\-
()i.(:r
the
entire FM
bancl.
The
AG(l
sigrral is
grickerl
rip fror':r
lh.'
irr;,ir
IF
output, through
:i transistor :rrri;iiii, r
:i
,l
detector,
ancl alrplicrl to tlre
gatt'of
il:r'lli.'r';,,
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ISOW 3HI
)NIII]D
ulNnl UnOA WOUI
Lead-ln
Wire
There
are three
basic
criteria
in selecting
the
appropriate
lead-in:
impedance
matching
(to
avoid
unneces-sary
signal
loss),
signal loss
characteristic
(expressed
in db/10o
feet).
and
shielding,
or intrinsic
resistance
to interference.
There are
two
impedances
of FM
systems:
72
(or
7i)
ohms,
and 300 ohms.
The
FM-5
provides
for direct
con-
nection
of either.
The majority
of antennae
are
designed
for
300
ohm
systems,
but matching
transfornlers,
or
baluns,
may
be used
to
convert from
one antenna
impedance
to
the other lead,in
impedance
with minimum
signal loss.
There are
several types
of
300
ohm lead-in,
but only
one
72
ohm in
comnron
use-coaxial
shielded
RG-S9U.
F'or
extrenrely long
runs,
RG-llU
is a lower
loss equivalent.
R(;
59tI
is
used
in many
apartment house
distribution
systems
and cable
TV systems
for it has
relatively
low
signal loss
and
good
life expectancy
and very
good
shicld-
ing.
It is fairly
expensive
and somewhat
bulky,
and the
instirllation
of
t:onnectors is
a
nuisance,
but it
is still
pre-
ferred
b,v nlan\:
inskrllers
where interfcrencc,
such
as from
rnotor
vehicles, is
a
problem.
'I'hr
lnost
lropular
300 ohnr lead-in
is the ll:rt
"ribbon"
twinlead.
It is
the least
exJrensive,
has
fairly low signal
loss
(
at
least
wlren
it
is new
),
and low
bulk, so it
can be
nrn
(
tlrough with
adverse
effect on signal
)
under
carpets
and
along walls with
minimum
unsightliness.
Since
it
has no
shielcling,
inskrllers
try to
avoid
horiz.ontal
runs
as much
as
possible,
skr.y
away from nretal
surfaces like
gutters
and
downspouts,
nnd twist
it
atnut once ear:h foot
to reduce
inlerrft:rence
pickup.
T'winlead
is more strbject
than nrost
to
the effects
of weather,
and it should be replaced
aftcr
about
3
years
in most
localitres.
In fringe
areas
where maximum
signal
transmission
is
irnportant,
a
special
open wire
300 ohm twinlead
uses
plastic
spacers to
supyrort
the two
conductors
with
a
mini-
mum
of loss. It,
too, has
no shielding
capability,
and is
affected
by the elernents.
Weather resistance
has
been
irnprovcd
with
sorne types
of
oval
twinlead,
both
hollow
and
foam-filled,
at
the
expense
of considererble
bulk
and
increased
cost-
The
most
recent
variation
is shielded
300 ohm
cable.
It
is
the
most
expensive,
with
rnoderate
signal
loss,
and
is
the
bulkiest
of
all. It
is weil
shielded
and
has
good
life
expectancy,
so
it is
preferred
by
manv
installers
in
urban
areas.
The
right
choice
of antenna
and lead-in
can take
maxi-
mum
advantage
of the
FM-5's superior
performance.
The
antenna
system
is
a
substantiallv
greater
factor
than
any
tuner
design
characteristic
in achieving
good
reception
of
weak
signals.
The
Dynatuner's
frorrl.
end
has such
low
noise
that
it is
doubtful if
any fr,rrm
of ltorlster
or antenna
ampiifier
can
provide
a signal
with
ari.u listcnilble
improve-
ment
over
that
directl-y
from
the
anteluri.r.
The
critical listener
nray
werll
spend
as
much
for the
antenna
system
as for the
FM-5,
but such
a
combination
will
accornplish
far
more
than
:r rurlitnenlery
atrtenna
at-
tached
to
tuners
several
times
the
cost of thc
Fi\,I-5.
OPERATION
OUTSIDE
THE
UNITED
STATES
CONNECTIONS
FOR
240 VOLT
AC
LINE
I'he
power
transformer
supplierd
in
tlie
I.NI-S
may
be
connected
for
a 24O volt
A(l lint-'as
nell
as ior
the
standard
720
volt
AC line,
which
is how
the
lransfornrer
is wired
unless
this
manual
is
stampecl
"240
volt".
'l.he
transformer
has
dual
primary
windings-
'I'hey
are
conntcterl
in
parallel
for
120
volts,
and in
series
for
240
volts.
'l.hc
notes
to
steps 93
and
94 of
the wiring
instructions,
arrd
tire diagram
on the
pictorial
insert
dctail
the
240 volt
conrrcctions.
The
14o
ampere
t
100
ma
)
slo-blo
fuse's*upg[jgd
with
120
volt
wiring
should
be
replace<i
rvith
a,,i,,
anrlrele
(ti2
ma)
slo-blo
fuse
when the
turrer
is
wired f
or
240 ua*u-se.
The
F'M-5
is designed
for
use with
either
50 Hz or
60
Hz
current.
Variations
of line
voltage
up to 10.1,
fronr
nominal
value
will not
affect
performance-
I'he
standard
75
yrsec
I,'M
de-emphasis
time
constant
used
in
the
Unil.ed
States is
used in nrany
other
countries
as
well.
If
-your
location
us€sr ttre
altcrnal.ive
iit)
lrsec
de-em-
phasis (common
in
Europe),
capacitors
C-64
and
C-65
on
the PC-26
board
should
each
be
chansed
to .fi)56
mfd.
ASSEMBTY
INSTRUCTIONS
Assembly
of the
FM-5 is
exceptionally
sinrple
when
compared
to
other
kits.
The
preassembled
etched
circuit
boards have
saved
you
much
of the
work, and
the
assembly
that
remains
is
arranged
in
an open,
uncluttered
layout
that makes
wiring
quick
and
easy.
The construction
lime
will be
only a few
hours,
but it is
best to
work
slowl,y
and
carefully
rather
than
worry about
the
time.
Construction
will
be
greatly
simplified if
you
have
some-
one help
you
by reading
the
steps aloud,
selecting
the
required
parts,
and
preparing
the
necessary
wire
lengths
as
you proceed.
When
you
unpack
your
kit,
check
ofi the
components
agairut
the
parts
list
at
the
back of
the
manual.
you
can
r4entify
unfamiliar parts
by matching
them
to
the
pictorial
diagram
or
photograph.
-,
Have
the
proper
tools
at
hand
before starting
assembly.
You
will
need
a
pencil-t5pe
soldering iron
of
J0- to 60-watt
rating
with
a small
tip,
long nosed
pliers,
diagonal
cutting
8
pliers,
a medium-sized
screwdriver,
and
6A/4O rosin
core
sokler not larger
than
Ytc"
diameter.
You
will also find
a
damp
sponge or
cloth
helpful
lo wipcr
the
ti1;
uf the
iron
clean
periodically.
An
inexpensive
wire
stripping
tool
is
helpful,
but some
people
prefer
a single-cdged
razor
blade
for
removing
the insulation.
A
good
solder
connection
does not require
a lrtrge amount
of
solder around
the
joint.
A
well-made
connection looks
smooth
and
shiny
because
the solder
flouts
into
the
joint
when
both
parts
are hot
enough.
There
are
four
steps to
making
a
gond
solder cor-rnection:
l. Make
a
good
mechanical
connection.
2.
Heat
both
parts
r..'ith
the
tip of
the
iron
rzt the
junction.
3. Apply
solder
to the
junction
untii
it
melts and
flows.
4.
Allow
the
connection
to
cool
undisturbed.
ALL
SOLDERING
MUST
BII
DOI{E
WI'TH
A
GOOD
GRADE
OF
ROSIN
CORE
SOI,DER.
l
g
-
E
g3
(J
;<
o
I
E
-
u
1A
PARTS LIST
fOR SCHEMATIC
DIAGRAM
All
resistors
aretlr watt, 100/o
tolerance
unless
otherwise indicated.
Rl 47 ohms
R2 330
ohms,5/o
R3
330 ohms, 5/o
R4
330 ohms,5/o
R5
330
ohms,5/o
R6 240
ohms
R7 2,200
ohms
R8
1,200
ohms
R9 240
ohms
R10
68 ohms
R1l 5,600
ohms,5/6
R12
5,600
ohms. 5/o
R13 39,000
ohms
R14
10,000 ohms,5/o
Rl5
100 ohms
R16
47,000
ohms
Rf 7 100,000
ohms
Rl8 2,200
ohms
R19
15,000 ohms
R20
15,000
ohms
R2t 4?0,000
ohurs
P"22 10,000
ohms,5/e
R23
8,200 ohms
R24 |
meg,ohm,5/o
R25 2,2OO
ohms,5/"
R26
47,000
ohms
}]"27 47,000
ohms
R28
47,000
oirms
R29 47,000
ohms
27,000
ohms
I rnegobm,
S/"
10,000
ohms, 5/e
10,000
ohms,
5/p
i00,000
ohms
4,7O0 ohms,5/o
10,000
ohms, 5/6
47,000
ohms
22,000
ohms,
5%
1.300
ohms,5a/"
220.000
ohrns
100,000 ohms
100,000 ohms
100,000 ohms
150
ohms
1i,900
ohms, 5!l
3.f)00 ohnis,
5/o
10,000
ohms,5o/u
220.000
ohrns
220,000
ohms
100 ohnrs
10.000
ohnis, 5!/,
10,000
ohnrs, 5o7i
2.2
nv'11ohrr.,Su/o
It10.000
ohms, 5!1,
12,000 ohrns, 5o/o
I,000 ohnrs
tl2 ohms, 11'lf
2,2O0
ohnts,
So/u
PART
#
1,000
ohms
ll7lo2
220,000
ohrns
rlz224
2.2
megokm,
S/s
11922s
180,000
ohms,5/6 1ter84
12,000
ohms,
5/o
119123
1,000 ohms
117rc2
82 ohms,S/o
l19a2o
2,2AA
rlvns,5/o Lr9z2z
1,000 rihms 117102
?20,(X)0
lhms r'7224
8.201i ctnns,
S/o rl9g22
1.200 t>hms,
5;li trgrzz
I,000 ohms,Slf 1t9lo2
I
,000
ohms 117102
100,00() ohms 117104
22,OOO ohnts,
Sa/o rtgzz3
il90
ohnrs,
50/6 1.19391
22,000
ohnrs,SJl, tre2z3
3.90 ohnrs,5o/" 119391
2,200
ohrns
117222
2,200
ohms rI7222
10,0O0
ohms
r171O3
150
ohnrs 117151
10O,000
ohms
117104
5(i0 ohms 1r7s61
560
ohrns
117s61
150 ohnrs,
5or/o,/2watt
113151
100
ohm ll7lol
3.3
megohm,
r12
watt
112335
PART
#
1t7470
t 1933
1
I 1933
I
1 1933
1
I 1933
1
LL7241
1t7222
rL7
1?2
LL724L
I
17680
I 19562
r 19562
r r7393
1 19103
1r
7101
It7 47
3
ll7l04
1L7222
t17153
1 l7 153
tL7
474
1 19 103
1t7A22
I l9 l05
tt9222
7t7473
tL7473
Lt7473
Lt7473
R30
R31
R32
R33
R34
R35
R36
R37
R38
R51
R52
R53
R54
R55
R5{i
I15?
It5B
R59
R60
It6 1
Ii{i2
It6ll
It64
R6i-r
R66
ItriT
R6rl
R69
R70
PART
#
t17273
I 1
9105
I 19103
I 19
103
1 17
104
rL9472
1 191
03
tL7473
1 1 9223
t17224
I
17 104
1 17104
I 17104
1 17151
1 I 9392
I 19392
1 19r03
117224
117224
I 17 101
119103
1 19103
tt9225
119184
I r9123
I l7l02
I r9820
R71
Il"72
R73
F'74
R75
R76
R77
R78
R79
R80
R81
R82
R83
ItB4
R85
R86
R87
R88
R89
R90
R9r
R92
R93
R94
R95
I1.96
I.a97
R98
R
r0l
B ferrite
bead
Cl 200
mfd, l5v.
C2
to
Cl2
.01mfd, lOOv.,20/s
C13 22O
pt,5/"
CI4 22O
1tl,5o/"
Cls 5 mfd, lSv.
Cl6 1 mfd,25v.
CI?
I mfd,25v.
C18
.01 mfd, l00v.,2O/s
Clg 33
pf,
NI'O
C20
.01m[<1,lOOv.,2O/s
C2l 33 mfd, 10v.
C22 33 mfd, 10v.
C23
1 mfd,25v.
C24 5
mfcl, t5v.
C25
.01 mfd, l0Ov.,2O/"
C26 .01
mfd, lOOv.,2O/s
C27
.01 mfd, lOOv.,2O/s
C28
5.6
pf,
NPO
C29 5.6
pf,
NPO
C30
.ot mfd. rOOv.,2O/6
Csf
5 mfd, 15v.
C52
.47 mfd, 100v.,
LOls
C53 5 mfd,
l5v.
C54
.22 mfd, lOOv.,
Llt/o
C55 .01mfd,33v.,5/o
C56
.01mfd, 33v.,5/6
C57
.1 mfd, lo0v.
10/6
C58 .0022
mfd, 33v.,5/s
C59
.01 mfd, 100v.,2o/s
C60 200
mfd,
15v.
C61
5 mfd, 15v.
C62
5
mfd, 15v.
C63
5 mfd,
l5v.
C64
.0082 mfd,
lD0v.,5/o
C65
.0082
mfd, L0Ov.,57o
C66
200
mfd, 15v.
C67
1 mfd,25v.
C68
.001 mfd, r}Ov.,
LOls
C69
1
mfd,25v.
C1O
1mfd,25v.
C?l .001
mfd,
IOOv.,
LO/s
C72
1mfd,25v.
C?3 36Opf,100v.,57o
C74 560
pf.
100v., 5/o
C75 .01 nrlrl,
l0}v.,So/u
CTti .01 mfd, lOOv.,2O/"
C77 .22 mkl, 10Ov.,
lols
C78 I mfrl, 25r'.
(179
..17 mfil, l(t0v.,l$/o
Cl80 .01 rnfd, l00v.,2lo/o
C81
.01 mf<i, 100v..2O/"
C82 .001 rnfrl, l}Ov.,
10/6
C83 .0()l nrftl, lOOv.,
LO/"
C84 500
mf<i,21-rv.
f-'t]s
500 mfd, 2trv.
C86 250
mf<I,25v.
C87 5 mfd, lSv.
C 101 .02
mtil, 500v.
Cl02
.0082
mfd, l00v.,5/s
Cl03
I mfd,
l5v.
Dl
germanium
diode
D2
germanium
rliode
D3
silir:orr rliode
D4
silicon
tliocle
D5
germanium
diocle
D6
gerrnanium
diode
D7
silic-on
dual diode
D8
silicon
dual diode
Dg
germanium
<liode
Dl0
silicon
diode
Df 1
germanium
diode
D5f
silitxrn
diode
D52
silicon
cliotle
D53
silicon
diode
D54
germanium
diode
D55
silicon
diode
D56
silicon diode
D57
silicon
diode
D58
silicon diode
D59
zener
diode
D60
zener diode
FE101
front
end
FLl
4-pole
ceramic
filter
FL2
4-pole
ceramic
filter
FL51 phase
comp.
6lter
FL52
67
kI{z
filter
FI53
19 kIIz
filter
FL54
19
kHz
filter
IC]r
IC
t_M7O:lL
lC2
IC LI\11703L
IC3
IC CA:J012
IC4
IC
LIU3O28
IC5
IC
I,M3OlAH
ICs1 IC
N,{Ct307P
/pA769
IC,52
IC I,M30IATI
IC]53 IC I,IVI30lAH
Ll 27
1th
choke-'
1,2 27
1rh
<rhoke
L5
I .43 mh
r--oii
1,52 7
mh coil
Ll-r3 7 mh
coil
L54 8 rnh
coil
417s90
2a3207
234103
245221
245221
283sO5
2831O5
283
105
234103
247330
234103
283336
283336
283
105
283505
234103
234103
2341O3
244050
244050
234103
283505
260474
283s0s
204224
263
r03
263103
204to4
263222
234LO3
283207
283505
283505
283505
264A22
264822
283207
283105
240t02
283105
283 105
240102
283105
254361
25456r
205
103
234103
204224
283
105
260474
234
1 03
234
103
240ro2
240to2
24O507
280507
2ao257
283505
227203
264A22
283 105
543541
54354 I
543 148
543148
543541
54354
I
546361
546361
54354 I
543148
543541
543148
543 148
543148
543541
5440t2
544012
544012
5440t2
540014
5401 13
553503
505 107
505107
420122
420022
420100
420r00
58701 O
5870
rO
s87012
s87028
587709
587307
587709
587709
413027
4t3027
422431
4220t9
4220L9
42203A
Pl
10,000 ohms
trimpot
140103
P2 22,000
ohms trimpot
140223
P3 4,700
ohms
trimpot
140472
P4 22,00{}
ohms
trimpot
r4o223
Pl-rl 470 olrnrs
trimJrot
74o47L
P52
10,0(X)
ohms trimpot
14olo3
Pl0l vollme control
w/switch
180203
Ql
transistor
ll0237A
Q2
transistor
BC237A
Q3
transisi.or
tlC'23?A
Q5t
FFI'| 2N54{:i2
Q52
transistor
llC237A
Q53
transistor
BC237A
Q54
transist<ir
IIC308B
Q55
transistor
BC23?A
Q56
transistorllL'3088
Q57
transrstor
BC23?A
Q58
transistor
tl(--237A
Q59
transistor
1jC237A
Q60
transistor
D40D2
577020
577020
577020
s97462
577020
577020
567070
577020
567070
577020
577C20
577020
574001
S10l
DPTT
rocker
switch
33loor
5102
DPT'|
rocl:er
switch
33iool
Sl03
DPll'l'
rocker
switch
334006
T1
ratio
tleter:tor
432022
T101
power
transforrner
464L22
T102
RF
balun
4L4ozz
PROTESSIONAL
SERVICE
ATIGNMENT
(FOR
QUALIFIED
PERSONNEL
WITH
THE PROPER
LQUIPMENT
ONLY)
There is
no
provision
for
any home
alignment
of the
FM-s,
and
under
no
circumstances
should
any
adjust-
ments
be made
without
the
following
service
equipment:
1.
Sound Technology
10O0A
FM
alignment
generator,
or
the equivalent,
such
as
a Measurements
Corporation
Model
88 or 210,4.
generator,
plus
a suitable
multiplex
generator
with
adjustable
pilot
level,
and
an
accurate
67
kHz
oscillator.
2. Oscilloscope-Hewlett
Packard
130C or
equivalent
with
its Diode
Probe
and a 10:1
Probe.
3. AC voltmeter
with rnrs
scale.
4. DC voltmeter,
with
0.5
volt
or
less
full
scale;
l0 megohms
input
impedance.
5. Intermodulation
Analyzer.
Operate
both the
tuner
and
the instruments
for
at
least
20 minutes
prior
to
alignment"
lF Alignment
Locirte
a dial settirrg
between
slations.
Switr:h the tuner
to NIONO,
Dynatune
OIrF,
and
maximum
volurne.
Tune
t.he
gerrerator
to the
same
frequency
with
2O0
kllz
devia-
tion
and :r
3fiX)
1r.v
output. Cotrnect
the
diode
probe
to
the scope
vertical
input,
with
a sensitivity
of
l0
mv/cm.
Set the scope's
horizontal
extcrnal
sensitivity
for
I v/cm,
with
the swccl)
I
"external"
or "horizontal"
)
output
of the
generalor
connectr:d
to
the horizontal
input.
'I'he
rliode
probe
connected
to Tp
1 of
pCl
15 *;11
show
tuning
:rs
a bandJrass
curve.
()enter
the
curve
on ther
scoJre
clisJrlay
with
the
tuning
knob.
'I'he
IF
secondarv,
accessible
tlrrotrgh
a
hole
in
the front
panr:l,
is
the only
adjustment
on
the front
end.
Seek
the
best
combination
of
s-ymntetr.y
and
lrnrplitude.
Detector
Redrrqr
lhe
swt't'1r
tct
75 klfz,
but be
cart'ful not
to touclr
ther
tuning
of eithcr
the
generator
or the I,'M-ir.
('onnerct
thc
I)C voltrrretcr
(
on its nrost
sensitivc scale
)
to
thc
tuner
chassis
and
to t'.velet
$4
on I,(l-25.
Adjtrst the
st'conrl:rrv
(
top.t
of ther
dgfeglor
transformer
T
1 for zero.
I)isconnect
the
diode
probe.
Switch the
gcnerator
to external
modu-
lation
and
connect
IM
an:rlyzer
to
it. I'he
IM
sign:rl
should
be in
:r 1:
I ratio
to
allow
for de-emphitsir;.
AdJust
the
IM
anal.yzt'r
level
for 100fti
modulation
as
indicaterl
on
the
modulation
nteter.
(lonnect
the
tuner
output
to the
IM
analyzer.
Adjust
the
primary
(
bottom
)
of the
detector
transforrner
for rninimum
IM. Ilemove
IM
analvzer.
Audio
level
Maintain
3(XX)
1rv
signal level
and switch
to
400
Hz
modulation.
Adjust
trimpot
P 4 on
PC-25 for
2
volls
audio
output
from
tuner
with
the volunre
control
fullv
up.
Muting
Threshold
Switch to
MU'|E,
attenuate
the
generator
output
to
8
pv
(assuming
the
use of
a 2:1
balun.),
and
adjust trimpot
p'b2
on
PC-26
until the
audio
just
rnutes
off.
Adjust
trimpot
P
52 until
audio
just
comes
on
ractually
4
t.v)
.
Dynatune
Return tl're
generator
to
3000
pv.
Connect
the
DC
probe
to
eyelet
#
-l
on I'(l-25.
Retune
for zero
if necessary.
Then
switch
the rnute
switch
to
DYNATUNE.
If
the zero incli-
cation
changesat
all,
adjust trimpot
P 3 on PC-25 for
zero.
67 kHz
Filtering
F
rom
an external oscillator
connect
an
accurate
67
kHz
source to
the external modulation
input of
the FM
genera-
tor.
(lonnect
the l0:l
probe
to
the negative
side
rthe
top
end) of O
51.
While observing
the
67 kHz on
the scope,
adjust filter
FL
52
for minirnunr
arnplitude.
Multiplex
Switch to
STEREO.
(lonnect
the
stereo
generator
to the
external input
of the FM
generator.
(lonnect
the 10:1
1;robe
to the
vertical
input of
lhe scope,
and set
the
internal
sweep
to
approximatcly
2 milliserxrnds/cnr.
(lonnect
the
probe
to
eyelet
f
ll on
l'(l
26.
Pcak
both ttre 19kHz
coils
L
52 and L
53 for nr:tximurn
vertical
deflection.
Go back
and forth.
Retluce the
pilot
level on
the
nrrrltipk:x
gcnerator
to 5o1,.
Adjust trimJxrt
P
51
trntil
the
S'I'FIREO light
goes
out.
Thcn
adjust trirnyrot
I' irl r.rntil
the
ST'EREO
light
just
comes
on.
'l'he
S'I'FIRFIO
lighl should
conle on
at
l:o,,,,
of
the
tot:rl
rrurriulation.
Ilcturn
ltilot
lcvel
:rt
generator
to
tU.L.
Move the
probt'
to evelct
#12
on P(l,26and
adjust
t,he il8 kHz
coil [,
54 for
rn:rxirnurn
vcrtical
deflection.
Rerrrove
probc.
With I kHz rnorlulation
on the left
channel
onl.y, observe
the right
ch:rnnel
output
lnd
acljust first thc il8
kHz
coil
L
54 nncl then
the l9 kHz
coil L
53
for nrinirnurn
indication
(
nraxinrurn
scparation
)
.
(lorrrpare
left
and right separation.
Switch to l0
kHz rnodulation
orr
the leftch:rnnel
and
adjust
filter IrL
5l for rninirnurtr
indic:rtion
(
rnaxinrurn
sr:o:rration
).
Meter Adjustment
Switch to MONO
and dccrease
F M
generator
output
to
10
p.v.
Set trimpot
P 1
on
PC-25 for
251( meter
deflection.
Increase
the
I.'M output
to 110,000
1,v.
Set
trinrpot
I,2
for
full
scale
meter
deflt'ctiorr-
ServiceNote:'fheTUNEDindicatorlarnpisapartof
thernrrtingcircuit.
If itis
shortecl
,theal6iowill
remainnrut.6,cve.
on
a station.
Switching
the
muting ofi
will
enable
signal
reception
until the
larlp
is replaced.
If the lalrp
is
op.ri, the
muting
circuit
will
not
work
and there
will
be noise
between
stations
in
all switch
positions,
ZU
KIT
PARTS
LIST
1
Chassis
bottom plate
1
Chassis
front
panel
1
Chassis
back
panel
1 Chassis
sub-panel
(black
front)
1
Circuit board
assembly,
PC-25
1
Circuit
board assemblv.
PC-26
I
Cover
I
Front
End
assembly
I Front plate--gold
I
Transformer,
power
1
Transformer,
power
(Canada
only)
2
I
I
I
2
2
AC
outlet
Antenna
Bracket,
lamp
holder
Bracket,
circuit
board
Cable, audio connecting
Cable,
coaxial shielded,
7"
Dial
plate, plastic
Flywheel
!-use
holder, with
hardware
Knob, small
Knob,
large
Label,
FCC
certification
Lamp holder,
clip type
Line
cord
Pulley,
tuning.
4" diameter
Sleeving,
largc.
(i"
Socket
striJr, arudio,
3
outl;uts
Switch,
rocker,
I)I,T"I'
(tl
lugs)
Switch, ro<:ker,
I)t'D'l' (6
lugs)
'I'ermirral
striyr,
3 screw
Terminal
strilr, 2 lug
Volume
control
with
switch
Wire,
hookup, black
Wire,
hookul),
green
Wire,
hookup,
red
C:rrd, warranty
Manual.
instruction
Parts
of similar
type which
do
not change performance
will
sometimes
be included
as
a matter
of expediency.
This
will account
for
slight variations
in
value
and
appearance.
PART
#
7 11622
7t1322
7rt222
7t1722
957025
957026
7t7022
553s03
769022
4641,22
464t23
351001
312316
7 tol22
7 to422
3ZlO72
320147
444022
I 15422
34100r
/64
r
B5
764tA4
80802 1
376022
322,J92
7
t7022
PART
#
859001
342101
342102
639308
617305
61706s
6t4245
6 I 4355
614065
ot tzuf,
6IL245
6
r
1355
61
3345
612339
613834
66026
I
895001
816022
96452?
4
t.102?
?2t2:)
2(),1t
2?
28Jl{li
8t)i)\)2 J
8.t.i022
508r)21'
it],':?]
/ l:'t:'.,
Hardware
Enuelope
4
F'oot,
rubber
i
Fuse,
/1e
ampere
slo-blo
I Fuse,
%o
arnp.
slo-blo
pigtail
(Canada
only)
4
Ground
lug
38 Lockwasher,
#6
2
Lockwasher,
yB"
29
Nut.
hexagonal,
#4-4O
6
Nut,
hexagonal,
#6-32
4
Nut,
hexagonal,
ft"
4 Screw,
machine,
#4-4O x
r/a,'
29
Screrw,
machine,
#4-4O
x
r,/+',
8
Screw,
machine,
#6-32
x
fi6"
3
Screw,
self
tagrping,
#6 blue
17
Scrt-'w,
sheet
metal,
#6
5
Sel. s<:rew,:),iti,,
Allen
head
I
S;r:rrr,r,
lubular
aluminum
I Slr;rirr
rr,licf
,
plastir.
ll
W:rslrt:r,
liber
I Wrcnch,
Allcn
#lr
Snrill
Prtrts
Box
;rntenrra
coil,
balrrn,
tubular
t:rlracilrrr,
.02 nrfrl rlisc
tr.r;rmit.
t:a1r:rcrtrrr,
.OCltl2
ntl<1, So.i,
r.ylar
<':rp:rt
itor,
1.0
mld clt'clrolytic
rlitrl
trrr<l :rsst'mbly
l:rrnp.
rlial,
tubul:rr
893002
3 55003
33700
I
334006
3 73003
31 2001
I 8O203
'2
I
I
2
I
I
I
:]
2
lanrp.
inrlicatt>r,
hluc
& white
lcads
l:rnrp.
irrrlit:rtor,
blrrr'&
rcd
lcatls
litnrp
trrvt:r,
blur'
plastic
nrctcr
mt'tcr
< ovt,r,
lrlat'k
poirrtcr,
rlial
pullc-y,
nylon
pullcv
srrpporl.
br:rss
rt,sistrrr.
li 13
mcgolrnr.
t./2
witll
slccr ing,
insrrllrlirrg. sm:rll
sprittg,
rli:rl
corrl
lttlting slr:rlt
:rsst'rrrlrly
I)o
nol
remoue
the teflon
topt,
Irom
thc
anglt'd
llurrgt'of
tlu' sult-puru,!.
o
t
\
frr,
a AaI|t
ftal er
"
i-
PC-2s
il
I
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t+ t+
tto
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lll
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r+
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THIS VIEW IS
OF
THE
CIRCUIT SIDE
OF BOARD
VOLTAGE
TEST POINTS
Measured
with
VTVM or TVM with
at le?st
19
megohms
input
impedanca.
All measurements
taken with
a 1500
pv
input
(unless
otherwisenoted),
MONO mode,
with muting
switch in DYNATUNE.
Chassis is
ground
referenca.
iJe
careful
the meter does
not
short to adjacent
circuit
points
or
damage may
result.
*
@
full
scaledeflection
of tuning meter
NC
=
No Connection
22
,,;','it
;' i'+
T
'l',
1
,6'S'
if
i,
l
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'
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NM: Not Measurable
(no
meaning)
litl
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j*c61-+
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