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';,,
lF Amplifier-
-.
I inriter-,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:t rr ,rrtr.rtlrt'r
4-pole
ceratrric fillcr
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<:h nr: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,,:
,'l
i,: ;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'e
r: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,rlii i'
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!,ii i,,!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:i i
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
l l1a.
,,
'i'-
i,
l i,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
i L'.,
,.\
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.
,
,.
i1 rt.
,,r,ril
l)(,
itt
lht_. deteCtOf
,,.r''.tr':
Itr',
1,
,r;;,:
i
I
l;lIi
,
,'t,tr I,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,.
:'.l ar'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:.
To Next Page
Loading...
Need help?
General
