Operating instructions

racliation
ancl
stray
coupling,
particularly
at
the higher
frequencies.
Ground
the
signal
gen-
erator
to the receiver
chassis,
but
do not
attach
an external
ground
to
either one.
Feed
the r-f
and i-f
signals, modulated
30
percent
at 400
cycles, through
a I70-ppf
capacitor
to the
points
specified in
the charts,
and use
the
output
me-
ter, set for
a 600-ohm load,
plugged
into
one
of
the
PHONES
connectors.
c.
Signal-Plus-ltíoise
To
Noise Ratio.
A
10
to
1 signal-plus-noise
to
noise
ratio is
specified
for some
of the r-f
gain
measurements
listed
in
d beìow.
To
obtain the
required ratio,
perform
the following
steps:
(1)
Set the A.F.
GAII{ control
to maxi-
mum
clockwise
nosition.
Connect the
signal
generator
to an-
tenna
terminal
A through
a
110-ppf
capacitor. Adjust
the
generator
out-
put
to
produce
a reading
at the
output
meter.
Turn
off the
signal
generator
modula-
tion
and turn
the A.F.
GAIN control
until the
output meter
reads 1
mrv
(approximately
.8 volt).
(4)
If
the meter
reads 1 mw
(approxi-
mately
.8 volt)
or
less
with
the A.F.
GAIN control
at maximum
and the
signal
generator
moclulation
off,
leave
the control
at maximum.
(5)
Turn
the
generator
modulation
on and
readjust
the
generator
output level
to
produce
an output
of
10
mw
(approxi-
mately 2.5
volts).
d. R-f
Stage
Gain. The receiver
output for
all the
measurements
tabulated
belolv should
be constant at
10
mw. The A.F.
GAIN
control
should
be
set for a 10-to-1 signal-plus-noise
to
noise
ratio
with
a
signal fed
into the
antenna.
Signal
generator
output
connectr()n
Control
grid, pin
6 of
\-1,
through
a .05-pf
capacitor.
Control
grid,
pin
6 ot
Y2,
through
a
.05-pf capacitor.
Control
grid,
pin
6
of
V3,
through
a ,05-pf
capacitor.
Control
grid, pin
6 of
V3,
through
a
.05-pf capacitor
rvith
signal
frequency
of
455-kc
modulated
30/c.
Frequency
mc
Signal
generator
oulput
A
1
1
2
2
3
3
4
A
1
I
2
2
a
ò
A
4
1
a
I
2
Ò
ò
À
A
1
1
2
2
ó
ò
4
^
18
oq
I
9.5
9.5
18
1.5
,n
2.7
I
Y.l)
9.5
18
l.o
2.7
9n
tr
9.5
18
I.D
9.7
.rn
18
5 or less
20
22
12
38
72
2I
18
1ó.D
26
45
fo
340
39
118
30
290
114
340
720
120
160
96
130
220
102
260
600
90
\20
Dtl
103
I
I
I
(
1
(2)
(3)
SignaÌ
generator
output
connection
Frequency
mc
Signal
generator
output
e. I-f
StaEle
Guin.
(1)
With receiver
controls
set
as in o
above,
set
additional controls
as fol-
lows:
Setting
RAND
SW. switch
Band
2
I{4IUAL-PREIPT
rg\rrg:gll"t
5 mc
(2)
The
gain
of the
i-f
stage is
as follorn's:
Antenna terminal
A
through
a Ll0-ppf capacitor.
1
I
2
,.
2
Ò
Ò
4
4)
I
-t,o
2.7
2.7
3.85
5
7.25
9.5
9.5
13.75
5 or
less
5 or
less
5 or
less
5 or less
5
ol less
5 or
less
5 or
less
5 or less
5
or less
5 or Ìess
Signal
generator
frequency
Signal
generator
output
connection
I
Signal Output
'
Generator meter
output reading
p\-
455
kc,400
cycles,
30% modula-
Converter
grid,
pin
6 of V3.
Control
grid,
pin
6 of
V4.
Control
grid,
pin
6 of V5.
10 mw
410
10 mrv
16,000 10
mw
70
tion
AGO 313A