DYNACO FM-5 Installation instructions

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THIS MANUAL HAS BEEN PROVIDED
COURTESY OF
WATTS ABUNDANT
FORE MORE INFORMATION VIEW OUR
WEB SITE AT
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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. :inrJthr, 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 rrrrrlerrlifft,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:tionfor the liuilcl'er. Th;
excellent specifications of ther FM_5 art: possible, and
guaranteeable,
rrnit to unit, lab model to pioduction kit,
becauseof 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 Lekeyour h:rncloff 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()urcesignal for the lowest
measurable distortion. you the listener cannot rio this.
In the past -youhave 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-tunesto the exactcenter of the IrM channel (the min_
imurn distortion point) in either mono or stereo.
Such pre_
cisetuning is accomplished
faster
and moreaccuratelytiran
any other tuning system.
A clearly audible virtue of this designis the total elimi-
nation of switching transienls in tl.re
operation of the mut_
ing function. And you have the convenienceof interstation
muting down to the levelsof 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 rehnedmuting
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.soperation thut selectivity
of adjacent channels is completely unaffected.
In urban locationswhere the FM-5's extremesensitivitv
could have been a handicap, speciai care was taken in thl
design of the front end to accommodateextremely 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-conrmontrroadcast-
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;rruuttrix-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<:tu,illr rlr"riLlrr
critcritr
wlri<rh
Ilrvortlrc :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 rlubiorrsvalirlilv_ 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'lsigrr:rls
lrc possiblt,.
:urrl lrltcrnlrlt,
t.hlrn-
nel isol,lrlionis irtrJrort:rnt.
Sensitivitv thc nrost clrrotcrl
ttrrrt'rspt'<'ifi<lrtiorr
is in
frrct of rrrinirnal conc()rn for trrostriscrs. 'l'lrt' lfNI 5'.rsl_'cci-
fit':ttiortof 1.7,5nricrovolts
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.
rrnrlt,xt.r'llr,nt
AM r mtrltip:rlh
) rc
jt'clion.
'l'lrc
sltr'1rlirrrilirrii
<rrrver'\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
tlurrrtlrt,
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<lwiih a sornewhat jaun-
diccd eye, and an aJrlrreciationthat inrlividrrallv irnpressive
fiqures do not necessaril.v yielrl thc best listcning results in
the re:rl wollrl. Fore'mostis the lirlil;rtion that nrost tuners
itre rlesignetl to nreet crileria establisht'rl trl' measurentcnts
rnlrtlc in a speciall-y shielricrl roonr. Such r.csultsare 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\1j} u,ls dt signcd frorn the
.grorrnrl
rrJrto 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 <lesisnusing 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;rlrlcof 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:rtrilitvrnakt'ssrrch
,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
cotrrbincsthc pcrforrrlrncc of flrr rrrort'
cor;lly
lrn<l<rlrrplr.x
I,'lVI
nrrrltiplcx trrners
with th()olrcntting t'rrst'
rrnrlsirrrplir:
it.y which has lxx'n a I)vrurco trlrrliliorr" lixlr:rrrstivr.
t,ngi._
trct'ring rt'st':rrr'hh:rs rcpla<xrrl
neerllessltrl.lrrslntr,rrts,
(:or)
trols anrl irtdic:rtors
with arrtornnlerlfunciiorriirg, [r.,t,ing
thc listener lo t'rrjo.ythc 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,rlvol-
ume level,
yotr neerl
only t.unc
trntil thc 'l'tlNltl) irrrliczrtor
is illunrinaterl
trt the desiredsiation^ 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<:kpancl
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<'rrltsignal :rn'rrs. Il slrorrlrlIrc t'onrrc<:tt'tlto the two
irrrtcr tll(X)
ohrn
) scr()u, tcrrrrinuls. A .llter scr:tion
of this
, rrurnrurlwill givt'r'ou suggt'stiorrs
I'oroiher lrrtr:rrn;ts
if con-
rlit
iorrsrt.rlrrirt' 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-ris 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 Lrcht,;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:rrationof sterco broadt_-asts
is i.r.rlrrr:r,rl,
or
blended, to improve tl'rc
sign:rl 1onoisc r:ttio orrwt,:rksienro
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,llrorlof
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_
nrorlateit.
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<rhsignals
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.hint.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
strongenorrgh
t0 lrr:liv:rtc
it, lrrrrltlrerrruting
circrrit. 'I'hc [)ynatune <:irr:rrit
t'rrlrblcs
I'rtr
grt::rtcr
tunirrg
precisiontlurn 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 conreon 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
agairrwithin ll() kllz oi thc bro:rdcast
frerluenc.r'.
If thc dial location is nrorc tl.r:rn
8()kllz dist:rnt frorrr
the
broad<:astfrer;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
notlighl
: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;rrr
,
,'t , ',
I'}A'l'-4
lrt't':rttri'lifi, ll ii , it,,,
i i.,itirii,;, 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''irr ,
'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.
FrontEnd
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:igeri,;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 sigrralis grickerl
rip fror':r
lh.' irr;,ir
IF output, through :i transistor :rrri;iiii,r :i ,l
detector,
anclalrplicrlto tlre
gatt'of
il:r'lli.'r';,,
lF Amplifier- -.
Iinriter-,Dett'clor
The IC internrcrliate
lrt'rlti.rtcr'.urilrir,l!.i;; {,ii!
,,r.r'.tl
i;r
a 4-pole (:eranlic
filtt-r.
irrrr;{hlr Il,' ;tn't;ii':.
: ll:trr ,rrtr.rtlrt'r
4-pole ceratrricfillcr arr,l ri hirl, i{ii;i; ii!riiirr:: ,rirr},iifier.
The IF gain is srLr
higl"i,
llr{l t}l{.lii::it;:rrt;i'.i,r,,':.,,
tlTr.'r
tive that lirniting {)ccurr-
{ln inl,nt lrgi,.r'
:llui;r. i'!l:r,r"
';irilt
in an FM sigrtal r:tirrcslxrrl(ls li, lit,rplilrrd{,
ii,,trlqi.lriti'l
';
or distortion irt an auriit,;liltplifie!. Ar:r'r;rritrrr'li'.
ilrrse lF
circuits were designeri frir nriltilriurrr ph.::,r.r
:.;lrifl
,;r.^r'lss
ihr,
pass band. 'lhis ;rir;rrtl:r<:hnr:ii;rlailr::lrrw r!iritiliillr ,;! rl.,r,
audio signal all thi: w.a.1'down
ilto tlre liLli:ir:.irirl.l
,r:!'i;r:r.;
useful reception of v.r.,' w{)tk si:iir:il,;.
A high gain i.('lil{rpliflar ririylrr:r rrti!i ilr,:r::,r':,,.,
i..i,ii:}r
provides an emitter {ollowcl ;r!.rilr,
t.rlill;lil : i,., : .;1i:,1.111-.
through a phase ((,nipertrja{i{-1n
ri{'i,,:
,'li,: ;rri,i .: '..; i;:r,j:i
filter with a 67 kl^Iz notclr f*r "i(lr! r:arrrr. ,r,t.r,.,,rrr
.r;r.1
through the muting FET.
6
,\{ulliplex
The If' ,:: rlt-:trle'er:ii''.:i.rit
is a crcss-caupled multiplier
r:fi.rnorf
rrl;,tl.ir:'
,.i rh r.,r.r:viciers
":rtlclitional 67 kEIz rejeciion.
A lor'. r-lts"..fiit..' with rlual notch rejection for 19 kHz and
illi k{{r is lt,l
l,', r-l }.,.'thl 4eenrpha.r:i!
rr.lwork, With the
I,'.1"!
:}'.[]]'. ....;{'iti,l-r
iiri ilrt, frr:rri Fanel irr ille FM position,
l-1,r.:..rlrrlt,,
tli!i:.()s;lr:.1,.r:iii
liut.r'uirtrric
control and an audio
itrl;rlr{ier lvrt:}r
llil ''il cf gnin. 'l'tre output impedance of
thc aittlto arr!irl;iief i.; l({Xi ohrns, r,a,irit.tt
permits very long
{'()llrlii{llirll;,.;1!,lr,r
t"',ili:
!1v.,;,,.J:t{":;
'l'1
. qiltii0;ind'rAPE
tri!f|,rll:
;rii' ;,.:r,rliii' i ;r:i'l
1t1r'
la'-.,r
,r!'i.i11i1
iS flependent
ti;t iit,: :.!:ttiltl ':i ll,r, r{:l;l|;r. r;r
i;il",,!.
,tlt t r"'r
"1
r', L i , 1i
i i,r ,rr. ,:. ; .,,lit.;rll-y
clesigned tO
ttil"., ti:(; ,, t;; ,l,li, ri'"rliil{ii;tt t:l i.iri,
..,n.t,;tl:Cst
signals fOf
opi.ir',i::ir
.t!,iii,,!il il,,,r,r,ii :;. i"!tiii, tltirrrirri as well those
ri:i-'itirl:)
r";itit
i, i.,rr.it iir,ir..:riliii\
iiir.llr
rr.1,,:r:itr. _\ktter feeds
:tr,..
r rii..irrlli l:ii. r:rnt
i:i..i i ;,r,i1,
."a,1.
,.ir.
fii;r:r and aftef
llr,.
i,;il;,i.,,.
i,ri:ii r.,r;
;.'!ilil;i13
.. l,ji1, .i,i1lril,; :t! i..rrr i: t'(,lilr0lit:tl !.,f,
:.1
COrnbitred
i. i:: .,..tij,'il
: ,r.t jr, iiir .i.';,, t0i ,rutput. lt SenSeS
,r
r
1i,r'
, r
,{ }rrii.
;r.,rri
,i..itt,l:t,rs
r_,ll'
t}re
audio (rnutes)
il,t" v;irrillio'l t;i,rll i-r()ltllt (,)i(ri,r,ds
80 litIz. It is also
it!';.,..r1i"i lr.',
i_ r,{,i}irri tigrutl v.fril:ir is:tlrr,.r
output of a 150
kil:l iriqlr prlirrs
lillt.r. .ii;,. irilcr.st;rl.i.)lt,
tr{use
at this point
l,r r'i:!t/irrr'
i,t, r'i)i iit
,'r,r;l .i'L
.i
.,
li.i,;r
{}
,r.ir .i.
t.i)
i ;;;r lll'i,
l.l
.llil, i
tl(irl1
,:tt|i
,,r,J iiLt,
ll i rll,,
I r'I,!jl
'I,rr)j.,.j' iti;t\r
I ilt
i,)...:.
'!rt'ri,
V.i)r,tl
.rj.
i1 ,;f ll1a.
,,
'i'-
i, li,r l''
' I i.,'i'
i il rr.t!r.rrtt:
j':ii ;rt.l{rii.,il:r
,,.t,i;,
r ,rr._.ir. r.,i.t,tiri
,,r,lv Lit,tl-rotrgl-rt
Of
ii. ,t I ::lrl.. :,,r.ilJilir.'r
, l ,-,
rl it,',, j ,rr.i.r,tt:1.ll'r',-til
r,,rith
a
jirrr
iL'., ,.\
r,rjJ.r\\" I ir, {1,.i('(.j
,'.
tj i !t ott11.,i,i
iq ;ffftplified
i', :r iri":r "r:rili
ulrr';;rliorlll ;rrrr1;li{ir.r
'l'irrs oulput is fed
i ,,
l, li' ll; ltrtttl I'r;ti
th)lillllll
li iirpitr'; irr q,lrat
nlay be
r',r,'
r'lr.r'r.:
I 'r. rio lril, i' i, ti,lll;ri
r.ttrirojs l.lre
frequenCy
|i r1
. ,. ,ll-)r,
; i'r,, i. ,
,. i1rt.
,,r,ril
l)(, itt lht_.deteCtOf
,,.r''.tr':
Itr',
1,
,r;;,:
i
I l;lIi , ,'t,trI,rt,,ilti,:fCftf
IXI fleteC-
1(,r
,r1,,.,'ri
,'itri
i,t.
]r
,,ri|il .t i.,
illr. llttt lrrt'Set
lnininum
rlisltlr
ii,1;,
prri,1i.
'i'ltt,
,rtrirrirl
,ri ilit .t,r-,,
1 :l)rl)lijilr rrrl:;t hc swit<fied off.
tri ti ',r'rrilrl
l/)(.,t;:rtr,rlr{
;;;11;11
;1li tlrc tirlt'. 'I'he AFC
"'\irtrlr)\\" ir.
rrrtjlr'nil,.r
i l,r :ir, !irrrilll inrlr,lrcrrrlt'nl,
of the
rllr!:11,,.
r:' itl:r \\Ittr,' ti" j )i lr',
t-,1
ir':rt,ltt,s
lt lrrctleterlnined
,.
rt :rl ilt ,i,lltir:l lrtltt)l' l'\ 'i,i ilr:iirlrr
of trr<lving
the
,lr
ri :1,, ,liliii,r
. liit-l, r'irr
rt:T
,r\\
li.l,(,s olT tlrr: S('rvO,lOOp
l,r,ii:'r,
", ,lilrli,
",ri.,r.
''p
rli.',:ri;
,r, i
, *llsi'rvcti ()nly,
whcn
ll1' r;rr1i1
r'- i,.,;. r.ii,rriJ | ),1.{;,i,,{ r ;r llft..k
gl' irtterStAtiOn
llilr:.r,
\rili :lt ltii'l:ri ,ltr
j llt !i|jr',' li;0i;, lxt r;,,^,'itChed
On
11
l.illt.
lrrdit .iilr i iqlii:r
'l'f
rt'
"'l rrrrt.il i,lfr) r-,
.:,-r';11.f14',i
ii, r;ir'{riitl)t)t
of the mut-
irrr it;ir' r'j:r'irii IIrr. "1.:lcrr.'r;"
lrli,. :'.lar'ltr:rtetl
by the
:iilltit i''r( r;.1.l,irr,,
iirt' 1;r'i,>rtr:i
r- i..i'
ilr,' L:] kFIZ InUltiplex
('tu't
i(r! 1i lt:r.' :t lry11,1;'1'
{lt:i:" ,'.rilsil;lttj l:.tirvcvef,
tO aVOid
:il
t'; :r
t{
r,1
rl, ;1r11:r.
;ti'(.(}tIrt),.iii\
ltrg it:- /}!;ef:lti..}If,
NJr
;rr,rrr 3[IpFlv
t!. |:ii .a,i,-l ,
ri,,,:t j,.. ..i_.:r;..
t!.:llrt:;tt,a
Il';iLi:tlir:lr
|:,
r:i' ;t,t;tifierrl
stt1r1;1.r,inclt:des z.ener
ii;:t iirr ii,t lier,trl.i;t:
;.iiilt:,
atttl series
ii,,l,
1r,::Sil
ivt ":iili:.

L
'suorlBJol aSur.rJ
auraJlxa ur leu8rs JeuorlJorrp arour
polsooq B urBlqo 01 ,{lrulrxoJd asolJ ur s€uualuB relrujrs
o^U Sururquo' .\JradoJd ro ,,3ur{cEls,, ruorJ ral:}Erx ?ua
-ra$lp p alrnb sl slr{J -sur-pBal oJerr?das
asn s^e^rlv -pBal
-u^\op alSurs € asn ol i-e ob^euualuB t(raJogrp a Jo sluurtural
aql 01 E[rua?ueouo Jo slBurtxJal aql lJauuoJ lou oo .tuaql
uao^\laq acuaJaJJalrrr
azrrururur 01 lJedB laal g lseal 1Buraql
alBJol (lsBrrr ourur- e{} uo pa}unour arE aBuuoJuB o.{
1 JI
'alnr e se wJ opnJJur sauo ?uacar
arout aql qSnoql 'sttr.
1-^.,{s
uor]nqrrlsrp ab-noq luau}rBde
auros ur oi-cr i)ql orl ,{uru srr{I 'puBq tr{.{ aql leafor ..{llB
-IllJE stur)lr-.{:-
€tlui)lllB uolsl^ala'} aulos ',l\.J,
puB tr\trgqloq
c)l slBrrHrs[)aJnl]i)t ,(11q3r1r-
apr^ord o1 'rallrlds Jo 'raldnoc
Ja>^-o,^] I?qlr^\ pilsn aq ueJ 'ur-pBal alijurs B rllr,!\ 'ai^aql puB
'
A1r,tr1
rsrrrs t\J.ilalqurr()suiJ aprnord osJE
asuuolue uorsrlalal
lsoIAI 'L J)rrE
q sli)uur?qc nJ, uae^r?aqsarl qrrqir\ 'pueq htr.,I
ar{l roJ ,{11u:rrlrearls
ln) JrB as-n
!\[j roJ aBuualu€ ?soqaq,L
';tJ{rlll)rntqu ur q}oq s^arld(Ins,{ouulrqJ v .ur-pual aqt
slJilur] lBi)r{ [)un 'rr()rlr]rrrruulrroo ,{q I)olJaIJB ,flasranpe oru
at?tlttilltlv Ai)tIiiII{-lJ
aq} :AloJJttJslles^
Js^Bal
olf >^ruorfeJo{
I)asn lso[r oq] rl?J ,,{t1
1eq1 a1o5 'lerJgauaq sr Jl?,}uozrJoq
aql llo Prilri)lrrP arll ijurllrl 'r-os^BJ
orros u{ 'sJuaura^ordur
JOilIJo
^r)rrr 'l{lfir;)rl sJr s-e
JJoly\
sr7
(uor?B)ol JSBtu
ur b^afuprlJ
lt]tll J)IIU
Anrrrno,( 'uaJBlrorJdaJsJllncsrp e ur aJRno,i{JI
'rolsloJ
nrnralrrB rru i)i-n pInoq-- no,{ 'i;--sduroc aql Jo suorlJeJrp
,{rrrlrrr
rrro:.;illu ^i)r{J Jr'JJA.),r1ol{ 'lJa/\\ Iro/\\.,{eur or1e.r
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ISOW 3HI )NIII]D
ulNnl UnOAWOUI

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,rrmof ltorlster or antenna
ampiifier can provide a signal with ari.ulistcnilble 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
240VOLT
AC LINE
I'he power transformer supplierd in tlie I.NI-S may be
connected for a 24Ovolt 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€srttre 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 savedyou 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 spongeor cloth helpful lo wipcrthe ti1; uf the iron
clean periodically. An inexpensive wire stripping tool is
helpful, but somepeople prefer a single-cdged
razor blade
for removing the insulation.
A goodsolder connection doesnot require a lrtrgeamount
of solder around the joint. A well-made connection looks
smooth and shiny because
the solder floutsinto the joint
when both parts arehot enough.
There are four stepsto making a gond solder cor-rnection:
l. Make a good mechanical connection.
2. Heat both parts r..'iththe tip of the iron rztthe 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.

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