Operating instructions

abling voltage
of
12
or 24
volts clc
mnst
be
supplied
by the transmitter.
When
a
\2-volt
d-c
source for clis-
abling is used, the
f
12
volts is
applied
to
pin
A of
J1,
and
the
ground
retltrn
circuit is
connected to
pin
Cl of J1.
When a
24-volt
d-c source is
used, the
f24
volts
is
applied to
pin
B
of
J1,
and the
ground
return is
connected
to
pin
C
of
J1.
b. The
sicletone output of the transmitter
should have an impedance of 600
ohms, and one
sicle free
to
be
grounded.
Sidetone
input is
connected to
pin
D
of
J1
ancl
pin
E
of
Jl
(ground).
(1)
Sidetone input voltage is impressed
across
R36
and
is fed into
V7 through
fixed attenuator
R12
and coupling ca-
pacitors
C27 ancl C47.
(2)
Sidetone
input voltage is fed into
V8
through
R12
and C27.
c. The audio output
connections,
pin
F
of J1
and
pin
E of J1
(ground),
are used to
suppll'
ANTENNA
+90v
J4tPtN
6)
SIDETONE
INPUT
-4.2
V J4
tPtN
8)
f
t.4v
J4 tPtN
il
J3
(PtN
A
)
AUDIO
OUTPUT
the leceiver
outpnt to the transmitter
for local
monitoring.
The
audio output of the receiver
is
taken from
the
600-ohm
secondary
terminal
of T1l
(pin
A of
J2 and J3).
d.
It is
possible
to use
Radio
Receiver
R-174/
URR
s'ithout
Pou'er
Supply PP-308,/URR.
For this
purllose,
A+, B+,
B-,
and
grollncì
conuections
u'ei'e
lrrtlnght
out to
J1.
(1)
For such
olteration,
the
lrositive
ter-
minal
of the
l.5-volt
ci-c source
(A+)
shor,rld connect to
pin
H and
the nega-
tive telminal
(A-)
to
pin
E
(grouncl).
The
positive
terminal
of
the 90-volt d-c sonrce
(B+)
should
connect
to
pin
K and
the
negative
ter-
minal
(B-)
to
pin
J.
Also, it rvill
be
necessary
to connect a 160-ohm resis-
tor across
pins
8 and
10
of J4.
(2)
A suitable cabinet shor"rld be used that
rvill
fit
properly
against the rvater-
proof gasket
around the
rim
of the
receivef.
NOTES:
I, UNLESS
OTHERWISE
SHOWN:
RESISTORS
ARE
IN
OHIVIS.
CAPACITORS
ARE
IN
N,IICROIlIICROFARADS.
K
=
I,OOO
OHMS
MEG
.
I,OOO,OOO OHN4S
SWITCH SECTION DESIGNAIED
NO. I IS
NEAREST THE
KNOB ENO.
S2 SHOWN IN
PHN.
POSITION.
KI
SHOWN IN
ACTUATED POSITION.
swrTcH sEcTroNS,AS vTEwED,ROTATE
COUNTERCLOCKWTSE,
r-.-;r
c
47
Lgl
?ooo
P
vzrprt
6) 6zto
v8
(PlN
6)
6R/D
c35
2000
TM
29s-36
AGO
313A
z.
4.
5.
o
7.
R t2
I
MEG
R36
I
MEG
c27
?ooo
R22
470 K
5+
+24
V J4
(PtN
t)
GROUND SEEKING
Figu,re
34'
Radio
Receiuer
R-l741L'ÍÌR,
rttattítctring ínptt't,
functional
schematic.