Operating instructions

section
lll.
OPERAT|oN
UNDER
usuAL
coNDtrtoNs
Cuutíon:
Reception
on
the
loudspeaker
of
early
models
of
the
receiving
set
has
a tendency
to
become
distorted
after
short
periods
of
opera-
tion,
because
of
air
pressure
u,hich
builds
un
within
the
por.ver
supply
and
has
no
ouflet.
Tà
prevent
this
condition,
loosen
the
cap
of
the
SPARE
FUSES
compartment
before
operating
the
set.
A
hole
has
been
clrilled
in
the
reàr
of
the
SPARE
FUSES
compartment
to
allow
reduc_
tion
of
air
pressure.
All
units
which
incor_
porate
this
expedient
have
a
caution
notice
affixed
to
the
lower
flange
of
the
receiver
front
panel.
20.
Prelirminory
Control
Setting
Before
starting
the
equipment (and
during
shut-down periods)
set
the front
panel
controls
as follows:
Control
P0sition
POWER
SELECTOR
srvitch.
POWER
sri'itch
SPEAKER
switch
OUTPUT
switch
A.F.
GAIN
control
R.F.
GAIN
control
6V,
12V,
24Y,
or DRy
BAT.
i
oFF.
]ON.
(OFF,
if
headset
is
used
arone
)
.
HIGH
(LOW
rvhen
dry
batteries
are
used).
Halfrvay
clockr,vise.
Halfrvay
clockwise.
NOTES
1.
For 115-volt
a-c
operation,
the
pOWER
SELEC_
TOR
switch
may
be in
any
position
except
when
the
receiver
is
used
with
a
tr,ansmitter,
The
srvitch
must
then
be in
either
the
6V or
DRy
BAT. position.
2.
Although
the
OUTpUT
srvitch
normally
is
set
at LOW,
n'hen
porver
source
is
dry
batteries,
it
may
be
set
at HIGH
for
emergency.
The
normal
LOW
settinE
conserves
the batteries.
21,
Reception
of
Moduloted
Signols
With
the
equipment
connected
properly
for
the
available
power
source
(par.
15),
and
con_
trols
set
as directed
in
paragraph
20,
operate
the
equipment
in
the
follor,ving
manner.
a.
Turn
the POWER
switch
to
ON.
ó.
If
the
equipment
has
not
been
used
for
r
Ìr€
w€€k
or longer,
connect
a 20,000_ohm_per_
,,'oit
meter
to
J102
on
the
power
suppl;r
(fig.
11),
'.,(.);134
and
adjust
R116
ior
a leirrlitrg
of L4
volts
(oar.
I'd).
c.
Set
the
BAND
S\\-.
su,itch
(S1)
to
the
band
u'hich
inclucles
the
rÌesii.etl
freqr,rency.
d.
Turn
PHt{.-C.W.-NtrT_['AL.
srvitch
52
to
PHN.
e.
Tune
the
receiver
to
the
clesirerl
fr-ec1nenc1..
Depress
the
DIAL
LIGHT
srvitch
l.hile
tuning,
only
if
the
receiver
is
being
operatecl
in
itn
area
that
is
poorly
lit.
(1)
If
the
desired
frequency
has
not
been
preset,
tune
to
the
signal
by
rotating
the
outer
ring
of
the
MANUAL_PRE_
SET
TUNING
control.
(2)
If
the
desirecl
frequency
has
been
pre_
set,
pull
out
the
fine_tuning
control,
lift
the
cam
arm,
and
rotate
the
MANUAL-PRESET
TUNING
CON-
TROL
until
the
at.rouecl
hole
is
over
the
desired
numbered
detent.
l.
Adjust
the
ANT.
TRIMNIER
controt
for
maximum
output
signal.
s.
Adjust
the
R.F.
GAIII
and
A.F.
GAIN
controls
to
the
desired
level.
22.
Code
ReceptÍon
With
the
equipment
connected properly
for
the
available power
source (par.
1b),
and
con_
trols
set
as
directed
in
paragraph
20,
operate
the
equipment
in
the follou'ing
manner.
a.
Turn
the
POIVER
switch
to
ON.
b.
If
the
equipment
has
not
been
used
for
a
week
or longer,
connect
a 20,000
ohms per_r,olt
meter
to
J102
on
the
power
supply (fig.
11),
and
adjust
R116
for
a
reading
ctf.I.4
volts
(urr.
15c1).
c.
Set
PHN.-C.\,V.-NIIT-CAL.
switch
to
C.W.
d.
Set
the BAND
SW.
srvitch
(S1)
to
the
ltand
that
includes
the
desired
frequencl,-.
e.
Tune
in
a coded
signal
and
acljust
the
B.F.O.
control
to
obtain
the
r:lesilecl pitch
of
the
beat
note.
The
desired
tone
mar- lte
oìt_
tained
by
setting
the B.F.O.
ccrntrol
to
either
side
of zero
beat.
Depress
the
DIAL
LiCìHT
switch
for
illumination,
if
necessiri.r-.
(1)
If
the
desirecl
frequencl.
has
not
been
preset,
tnne
to the
signirl
b1,
rotating
t7