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.
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