Operating instructions
c.
The
tube
amplifies
the i-f
signals
ancl
de-
lelops
the
amplified
signal
across
the
primary
of T11.
The
signal
is
coupled
inductively
to
the
seconclary
of
T11
in
the cletector
circuit.
58.
Detector
ond
Avc
Stoge
V6
6s.27)
The
detector
circuit
converts
the
i-f signals
to intelligence
for
all mocles
rif
oper.rrtion.
The
avc circuit
cìevelop-s
the
avc
bias for
the
first
r-f,
second
r-f,
ancl first
i-f
tubes in
the
receiver..
a.
The
i-f signal
is
coupled
inductivell,
to
the
secondarl'
ll'incling
of
T11
and fed
to the diode
plate (pin
4)
of
tube
\16, a
type 1U5
diocle-
pentocle
tube.
Tube
V6 rectifies
the
i-f
signal,
ancl
the audio
component
of the
signai
is
de-
veloped
across the
cliode load
resistors,
R1T
ancl
R18.
Capacitors
C29 and
C30, are
i-f
filters.
The ar"rdio
signal is couplecl
capacitively
to
A.F"
GAIN
control R19A
thror;gh
capacitor
CSl.
Ò.
At
the
junction
of R17,
Rtr8,
ancl
CB0,
avc
voìtage
is
pickecl
off by
resistor
R15.
Avc
filter
capacitor
C22 ancl
resistor
R15
determine
the
time-constant
of the
alc
uetrvork.
The
avc
volt-
age is
groundecl
u'hen
section
1,
rear,
of
pHN.-
C.W.-NET-CAL.
-su'itcir
52
is in
an1,
position
other
than
PH\I.
tr'ol
orhel settings
of
the
srvitch,
the
avc
voltage
is su1t1tìied
to
the
r-f
stages
ancl
the 1st
i-f
,qtage.
59.
A-f
Amplifier
V6
6s.27)
The
a-f
amplifier
section
of \'6
an-rplitre,s
the
audio
component
of the
cletector
output.
The
circuit
is
operative
for
all
modes
of
oltelation.
a.
The
audio
signal
is co';pled
to
the
control
grid
circuit
of V6
from
the
arm
of A.F.
GAIN
control
R19A.
b. Filament
voltage
is
supplied
from
pin
11
of
J4.
Screen voltage
is
supplied
from
pin
6
of
J4
(90
volt-q)
through
voltage-c'lroltping
re-
sistor
R20
and contacts
C and D
of relar.
K1.
(Rela1'
K1
normall].
is
de-energizecl,
atrcl con-
tacts
C and D
are closed.
In
s1'stem
applica-
2O I.F
AMPL
CALIBRATION
OSCILLATOR
V5
tR5
DET AVC
A-F AMPL
V6
lu5
c34
.OI
UF
LOW A.F
Ai/PL
8FO
v7
rR5
î22
.OI
UF
R2l
470K
c47
2000
R24
2,? MEG
R3l
470
K
Rr6
4 700
SECI
I
REAR
HIGH
A.F AMPL
v8
3V4
Rt7
47K
.OI UF
c32
.OI UF
RI9B
2 MEG
v
/
(PtN
6)
|HRU
R /
2D R-F
AMPL
V2(P/N
6)
THRU
R4
/
5T t-F
Rr8
t80 K
c3l
1000
R
I9A
IMEO
+90
vDc
THRU RELAY
KI
(coNrAcrs
c
ANO
D)
R?7
5.6 MEG
R
zo
OK
Fígure
27.
Radio Receitter
R-17tr/URR,
U 3134
R30
2^2 MEG
c40
.,rr
I
5, S2
SHOWN
IN
PHN,
POSITION,
6.
SWITCH
SECTION
DESIGNATED
NO. t
IS
NEAREST
THE
KNOB
ENO
7. SWITCH
SECTIONS,AS
VIEWED.
ROTATÉ
COUNTERCLOCKWI
SE.
detector,
arc and a-f antplí/it,r,
i
uttr.tiottcLl
schematic.
NOTES:
l.
UNLESS
OTHERWTSE
IND|CATEDT
R22
ALL REsrsrANcE
vALUEs
aRE
rN
oHirs.
47o
K
ALL
CAPACITANCE
VALUES
ARE IN
MICR0ît!
ICRO
FARADS.
=
r,oo0
0HMS
=
r,0oo,o0o
oHMs
=
MICRoFARADS
2.K
3.
MEG
4. UF
-4.2V
0 C
TM
295-28
ii:
.iT'f|!
"'I
45