Operating instructions

2 D I.F AMPLIFIER
CÀLIBRAÎION
OSCILLATOR
v5
tR5
sr
FRONT
REAR
470
7
F>
I9T R.F
AMPLIF|ER
TM
295-32
C
RYSTA
L
CRz/U
il.6
UH
.OIUF
I
I
--4
!l
lsl
I
zL--
--J
l4l I
___-l
IBANo
Sw.l
I
sf- I
I
I
,,a
L-
S2
SHOWN
IN
CAL, POSIÎION
Figure
s1.
Rttdio
Receit-er
R-1Zt+lL.tRR.
65.
C.W.
Operotion
(fig.
32)
When
the PHN.-C.W.-NET-CAL.
srvitch
is
in
the
C.W.
position,
the
bfo
is
operative,
ancl
the
iit-c
voltage
is
grounded,
itrcreasing
the
gain
of
the
receiver.
Section
1,
rear,
of
the
su-itch
removes
the
bfo
ground
connection
and
places
a
ground
on
the
avc
bus.
66.
NET
Operqtion
(figs.
32
and
34)
In
the
NET
position
of
the
PHN.-C.W._NET_
CAL.
sri'itch,
the
receiver
operates
in
a manner
similar
to
that
of
C.W.,
except
that
the
circnit
to
rela)'
K1
is
openecl.
Section
2,
rean:,
of
the
sri-itch
performs
this
fr-rnction.
Disabling
the
lelal'
permiis
the
tuning
of
the
etcítet.of
the
.,)c:r1
transmitter
to
the
Net
Control
Station
:ì'e(tltenclr.
This
is
accomplishect
by
tuning
the
r'r.cei\rer
to
the Net
Control
Station
frecluency
rrrl
tuning
the Iocal
tlansmitter
erciter
to
the
;rrecl
receiver
freqnency (par.
23).
Opening
,,
relay
circuit pret.ents
the
disabling
of
the
,
eir.er
rvhen
the local
transmitter
is
turned
on
,
_r1BA
sEct
3
FRONT
NOIES:
I,
UNLESS
OTHERWISE
INOICAIED:
ALL RESISIANCE
VALUES
ARE
IN
OHI\1S.
ALL
CAPACITANCE
VA'LUES
ARE IN
MICROM
ICROFARADS.
ALL
INDUCTANCE
VALUES
ARE
IN
HENRYS.
2.K
.
I,OOOOHMS.
3.
UH
=
MICROHENRYS.
4.
UF
=
MTCROFARAOS.
5,
SWITCH
SECTIONS
DESIGNAIED
NO.
I
ARE
NEAREST
THE
KNOE
END.
6,
SIVITC}i
SECTIoNS.
AS
VIEwED,RoTAÎE
COUNTERCLOCKWISE,
ctr I
i
b
r
at i
on
o s ci
I I cr t or,
.hnt
c t í ot
t tt I
s clt
ematic,
during
the
exciter
tuning.
After
the
elcifei.
is
tnnecl,
the PHN.-C.W.-NET-CAL.
srvitch
shoulcl
be
set
to PHN.
or
C.W.,
before
the
tunins
of
the transmitter
is
completecl.
67.
CAL.
Operotion
(figs.
32
and
38)
a.
trr.r
the
CAL.
position
of PHN._C.W._NET_
CAL.
sr,vitch,
the
receiver
is
capable
of
receiving
signals
only
from
the
crirstal
calibration
oscil-
lator.
The
conclitions
are
the
same
as
C.W.,
except
that
the
cr1'stal
calibration
oscillator
is
operative (fig.
32),
the
antenna
circuit
is
open
(fig.
33),
and
the
primary
of
antenna
trarìs_
former
T1
or
T5 is
shortecl
(fie.
33).
The
R.F.
GAIN
control
is
iuoperative.
ó.
In
this
mocle
of
operation.
scfeeìl
r-oltage
for
r-f
tube
Vl
and
i-f
tube
\--1
is ollt;1i11s11
ft.cm
the
90-r'olt
d-c
potentiaì
irt
piu
Lì
r,t
J-1
tht.oLrgh
section
3,
rear,
of IrH\-,-('.\\-.-NIlT-('-{L.
su,itch
32
and
section
1 of
IIA\I)
S\\-.
sri,itch
51.
ancl
the
voÌtage-ciro11pi111.
r'esist.t'
nel\\-(,1.k
consist_
ing
of
R35,
R:11.
rLnrl
Iì:ì:l
(1i!..:ì:l).
These
i.e_
sistors
:ri.e
elintìniLterl
succersir-ell-
front
the
screeìl
cir.cuits
ot
\-1
tuttl
Vf
as
BANII
S\\r.
v/wo,,1y
*/4
t/
oc
i
51