DYNACO FM-5 - Page 6

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.