Operating instructions
Section ll.
CONTROLS AND
INSTRUMENTS
18. Rodio Receiver
R-174lURR
(figs.
10, 12,
and 40)
The
follorving
table lists
the controls
of the
receiver
and
indicates
their functions:
Control
l'u n
ct
ion
Terminals A
and G Pi'ovicle r.neans
cf connecting
reel
anf,enna.
Control
PHONES
jacks
(J2
and
J3).
MONITORING
IN-
PLTT
receptacle
(J1).
Receiver
por,ver
in-
pnt
receptacle
(J4) (on
back
of
chassis).
Function
Plovide
connections
fol
tri,,
l
r,
of headsets.
Provides
fol
connection
of rìrt, r,,
ceiver r'r'ith
associatecl
tr.an.rri'.-
ting
cr ieceiving
cqui1,r11, 1
'
(par.
68).
Plovides
connection
fnr. r.eccir..i.-
polver
supply
connccting
calrle.
Antenna
itrput i'ecep-
tacle
(on
top
left
side).
R.F. GAIII
eontroi
(R32).
BAND SW.
(S1)
ANT.
TRIMMER
(C2).
Number tletents
(0
io 9).
Fine-tuning control
(marked
PULL
OUT
BEFORE
PRESET TUN-
ING).
MANUAL-PRE-
SET
TUNING
control
(
C1A,
C1B, C1C,
and
c1D).
B.F.O. contlol
(C44)
OUTPUT
switch
(
s4).
A.F. GAIN control
(R1eA,
R19B).
PHN.-C.W.-NET-
CAL. switch
(52).
DIAL
LIGIIT
switch
(s3).
Antenna shorting
srvitch,
AGO 313A
Provides
means
of connecting
an-
tenna
mast
seetions.
Controls the scleen
voltage
of V1
ar-rd V4.
Seiects
hand
in
which
the r.eceiver
is
to be operated:
Posi.tíon Bantl
1. 1.5 mc
to 2,7 ntc
2.2.7
mc
to 5 mc
3. 5 mc
to 9.5 mc
4. 9.5 mc
to
18
mc
Peaks
signal
input reception.
Provide
means
for
presetting
as
Ì11any as 10 channels.
Fine tunes the receiver
to the
de-
sired frequency. Pulling
out of
fine-tuning
control,
lifting
of
the cam arm, and rotation
of
the MANUAL-PRESET
TUN-
ING control tunes
the
receiver
to any one of 10
preset
channels.
Contlols operating frequency
of
receiver. Rotation
of dial tunes
the receiver
to the desired fre-
quency.
A
dial lock is
plovided
to
prevent
shifting after
the
dial has
been set,
ACjusts
the bfo for zero-beat
and
tone
signal.
Connects the
receiver
to deiiver
either a high-level
or
lorv-level
audio outpul, on the
HIGH
or
LOW
position,
respectively.
Adjusts
the
level
of audio
output,
Selects the type of operation,
PHN.,
C.W., NET, or CAL.
A momentary
contact slritch
to
illuminate
the dial
lr'hen
tuning.
It
also reduces the
polver
output
of the
receiver
n'hen operating
u,ith OUTPUT
srvitch 54 in the
HIGH
position.
Plovides means
of
shorting out
antenna
'nvhen
checking
calibra-
tion of the receiver.
POWER
SELECTOR
s$'itch
(S101).
POWER
switch
(s103)
SPEAKER switch
(s102).
Filament voltage
test
point (J102) (on
right
side of
chassis).
Filament voltage
con-
trol
(R116) (on
right side of
chas-
sis).
POWER INPUT
receptacle
(J103).
DRY BATTERY
receptacle
(J104).
OPERATING
FUSES
110V, 14._
24V. 34.-12\r. J-\.-
6V.8A.
SPARE
FUSIJS
lec ept zrc
I
e.
Selects
type of operation
for
porver
supply. This
switch may
be
in
any
position
for 115-volt
a-c operation except
lvhen
the
receiver
is operated
with a
transmitter.
The
svgitch must
then
be in
either the
6V or
DRY BAT.
position.
Turns
power
supply on
or off.
Switches the loudspeakel
in or
out
of receiver output
circr-rit.
Provides
nreans
for rneasuling
filanrent
voltage
for tecciver'.
Controls filanrent
voltac"e
for
tubes in receiver.
Power
input cor.rnectol
fot'
115-
volt
a-c, 6-, l2-. ol
jl-volt
cl-c
operation.
Porr-ei' inlrLrt conni.ctor
fol dly-
batter'1'
opelatior.r.
I'use
1ri,$
t.t :.tpDlv
fot'
differ.ent
l)r)\\'(.l
iÌìlrLtt
Voltages.
Iìrtain-.
spale
fuses.
19.
Power
Supply PP-308/URR
(figs.
11
and
13)
The
following
table lists
the controls
of the
power
supply
and
indicates
their functions:
Control
Function
t5