www.SteamPoweredRadio.Com
INSTRUCTIONS
BTE-108
E-1
Direct
FM
ES-27278
Quantity
1
2
See cable
*
of
crystals
and
Multiplex
-10B
ordered
. . .
..
ot
(N
OF
....
....
supplied
Exciter
FM
Unit
Crystal
Operating
of
Set
FCC
of
Set
Instruction
frequencies.
Unit
(Spare
Spare
Books
LIST
BTE
. . . . . . .
to be
Tubes
Tubes
Exciter
EQUIPMENT
...
co
. .
. .
be
27278)
. . . . . . . .
...
.
....
.........
..
ordered
..
Exciter (ES-
FM
Description
..
.
..
.
separately)
.........
-
..
.............
. . .
... ...
separatel
Reference
. . . .
....
...
.
.
....
.
. . .
....
y)
MI-34501
-34509*
MI
Ml-34510
IB- 30262-1
Description
ceramic, .01
feed
, ceramic, 5
or, ceramic, 2,200
ceramic,
1N34A
diode,
neon
amp
mount
shock
quantity
5-
*
Capacitor,
Capacitor,
Capacitor
Capacit
Capacitor,
Crystal
Lamp,
Fuse, 0.5
Mount,
minimum
thru
µf
- .00 l
µµf
µµf
10
shipped
µµf
.
RECOMMENDED SPARE PARTS
Symbol
Cl22,
Cll5,
4,
Cll
3,
Cll
6,
µf
Cl0
l32,
C
Ct69,
CI07,
l46
C
33,
Cl
l48
C
C214,
49, C
Cl
CRI0I,
DS!0l,
Fl0I,
Cl38, Cl40,
5,
l3
C
Cl80,
,
72
Cl
Cl27,
Cl20,
Ct50
47,
Ct
,
Cl56
Cl55,
Ct
Cl71,
Cl6
l60,
CR102, CR104
DS102
F102
,
77,
4
Cl4
4, C209, C211, C212
Ct8
Cl31,
Cl29,
Ct66
3, C207, C208,
Ct8
Cl26,
l24,
C
Cl52, Cl53, Cl57,
5,
Cl43,
C t34,
CI09,
30,
Cl
Cl44,
Cll0,
Quantity
5 73960
5 99177
5*
5*
2
5*
2 212327
Stock
77688
779
77865
59395
101857
57692
No
53
.
www.SteamPoweredRadio.Com
E-2
0
)
••••••••
••••e ,,.. •
••••••••
••••••••
··~••11••
..
••-'••
~ 0
FIHAI.Mo'IP
c.,
T\IMllilt
0
92203
Figure
E-1.
BTE-108
FM
Multiplex Exciter
www.SteamPoweredRadio.Com
TECHNICAL SUMMARY
E-3
ELECTRICAL CHARACTERISTICS
Type-of
F rt-quency Range
Power
Output
Frequency
Modulation
Carrier
Audio
Audio
Audio
Harmonil"
Fl\!
AM
Suh-carrier
Sub-carrier
Sub-carrier
Main-to-Sub-channel
Sub-to-Main-t·hannel
Power
Altitude
Ambient
Emission
Output
Impedance
Deviation
Capability
Frequenl"y
Input
Input
Frequency Response
Distortion
Noise
Level
Noise
Line
Slow
Voltage
Power
Crystal
Temperature
Stability
lmpedanl"e
Level
(referred
Level
(referred
Input
Level
Input
Impedance
Center
Frequency
Requirements
Variations
Consumption
Heaters
for
100'7,
mod
(100%
mod.)
00-15000
00-15000
(30%
Crosstalk
Crosstalk , .......
Range
to
to
..
l"ps)
I00
o/c, FM
carrier
mod
...
Range
......
. of
.
MECHANICAL SPECIFICATIONS
Overall
Weight
'Level
'Audio
curve.
"Distortion
measured
'
Subcarrier
if
required.
Dimensions
measured
frequenq
at
input
• response
includes
following a standard
modulation
(See
all
Subcarrier
. . .
(J
IO
I)
referred
harmonics
75
percentage
Modulation
using
to 75
up
µs
de-emphasis
can
400 cps
to
be
in
l"ps)
mod.) ....
voltage)
carrier)
. .... . .
. .
.. ..
tone
µs
pre-emphasis
30
kc/s
network.
brought
text.)
. . . . .
. . . . . . . . . .
.
and
is
to
50%
.....
....
. . . . .
'
Referen(e
by a 400
50- 15000 cps tones.
''Reference
by a 400 cps
kc/s)
by 30- 6000 cps tones.
on
main carrier.
F.,
88- 108
10
wall,
50
ohms
±
75
± 100
± 1000 cps max.
600/
+
10
±
I
db
0.
5%
-
Gs
- 50
5v
n1ax.~
10,000
.
,o
to
-
55 db'
- 65
240/208
±
5%
300
wa11s,
I
17
volts,
7500 ft .
-20
°C
Height
24½
"
80
lbs.
shall
be ± 7. 5 kc/s
cps
tone.
shall
be ± 75 kc
tone
. Sub-channel
mt-/,
k(/s
kc/s
150
ohms
± 2 db'm'
max.'
max."
db
max.
db
max.
ohms
67
kc/s
db
"
or
50-60
max
to
Main
min.
117 V,
Approx.
cps,
.
+45°C
Width
19"
deviation
channel
deviation
Subcarrier
single
phase
IO
walls
Depth
of
modulation
of
modulated
50/60
each
11"
the
suhcarrier
70%
the
main
JOO%
modulated
cps
by
carrier
( ± 7. 5
30%
Symbol
VlOl
V102
Vl03
Vl04
Vl0S
Vl06
V107
V108
Type
6AQ5
6AQ5
6AQ5
6CL6
5763
5763
6146
6AH6
Reactance
Reactance
Master
Oscillator
Subcarrier
Frequency
Frequency
Frequency
Power
Amplifier
Frequency
Function
Modulator
Modulator
Modulator
Tripler
Tripler
Doubler
Divider
and
(1/3)
TUBE
COMPLEMENT
Symbol
Vl09
VllO
Vlll
Vll2
Vll3
V114
V115
v116
Vll7
V118
Type
6AH6
6AH6
6AH6
6AU6
6AH6
12AT7
6AS6
2D21
OD3
lEPl
Frequency
Frequency
Frequency
Crystal
Crystal
Cathode
Off-Frequency
Off-Frequency
Voltage
Cathode
Divider
Divider
Divider
Oscillator
Frequency
Follower
Regulator
Ray
Function
Divider
Detector
Control
Tube
(1/4)
(1/4)
(1/5)
(1/5)
www.SteamPoweredRadio.Com
E-4
DESCRIPTION
a frequency mod-
RCA BTE-10B, ES-27278,
The
ulated exciter which provides an r-f
any specified frequency in the 88 to 108
at
watts
compact
megacycle band.
subcarrier
a subcarrier
provide for
the main
to provide for various applications
such
authoriz!!d, stereophonic sound.
The
BTF-5B
replace the exciter units
mitters,
exciter
unit incorporates features which make it easy
adjust, easy to
All r-f multipliers,
ploy single-tuned circuits.
in a
generator.
the BTE-10B
power supplies and an oscilloscope
alignment.
The
conjunction with the BTX-1 A Subcarrier Gener-
fn
ator, will
rable
-noise ratio
co
of
programming
R-f
BTE-108 use relatively
cuits, thus simplifying
can be switched to read the
currents:
third
current;
The
citer simplifies
AFC
taneous checking
and
detector. Displays are in the
ures, with the advantages
can be observed easily. Checks can be
operation
way.
ther
o
modulator
FM
ckground
ba
as
BTE-10B
5KW
that
or
power
standard
BTE-10B
the main
to
the subcarrier will be somewhat limited when
multiplier
Modulator
multiplier
AFC
monitor
frequency dividers. A switch permits instan-
a check
without
type display requires no synchronization
This
adjustments.
The
stage which can be fed
generator
multiplexing
channel. Thus,
FM
of
output
maintain
cabinet rack
Employing
is
provide
and
the subcarrier separately.
control voltage;
of
such
one
music, and, if it
the exciter used in the RCA
is
Transmitter.
of
any ocher FM
of ten watts
nd
a
including
miniature
a self-contained unit
properl
when
subchannel
channel
FM
distortion.
power
and
broadband,
adjustment
cathode current; second
currents; PA cathode and
grid
oscilloscope
adjustment
adjus
and
the control action
disturbing
is
output
incorporates a
unit
the RCA
as
two subcarriers
or
designed especially
is
it
FM multiplex
of
should
can be used to
It
previous RCA FM trans-
smitters where an
tran
a
is
very reliable in operation.
output
the
exciter can be housed
The
together
and
tment
at
th
with
tubes
y adjusted,
perforn
regard
_with
frequency respon se
The
amplifier stages
single-tuned
built
. A
following
plate voltage.
and
incorporated
maintenance
ll
a
of
of
form
lock-in
the
of
AFC
of
I A to
BTX-
become
ate.
dequ
stage, em-
a subcarrier
throughout,
built-in
with
facilitate
co
and
compa-
ce
n
~a
signal-
co
of
n
-i
voltages a
in the
of
five dividers ,
the phase
of
Lissajous' fig-
divider
the
during
made
circuit in any
ten
from
on
The
co
used
the
or-
meter
nd
and
plate
ex
the
or
Power
The
-c
d
germanium
ments are
wave silicon rectifier.
All
a vertical chassis. Special hinge-type'
the bo
at
to be
components
supplies employ semiconductor rectifiers.
voltage regulated supply which furnishes
high
screen voltage utilizes a
and
plate
oscillator fila-
co
and
the
the
side.
employing
mounting
top
wiring
rectifier.
supplied
components
corners
ttom
swung
out
on
the
Modulator
by a d-c supply
the BTE-10B are
of
permit
access
for
underneath
CIRCUITS
the BTE-10B Exciter
A block
in Figure
which operates
two reactance
the main
the subcarrier; three frequency
output
the
the 88 to 108 me range; automatic frequency control
circuitry;
voltages
The
oscillator which operates
approximately five
desired
6AQ5
oscillator
pull, are inductively coupled to the place tank. R-f
voltages
out
90 degrees
Thus, one tube appears as a capacitive reactance and
other
the
oscillator tank.
ponent
audio voltage applied to the
the frequency
The
applied
by the
described in a later
The
6CL6, provides
the main r-f ca
s
on
to
deviation
Use
coupling
diagram
2.
channel;
stage to
and
for
master oscillator
output
reactance modulators
plate
the two
on
ase with respect to each other,
ph
of
out
appears
presented to the
mean frequency
to one grid.
automatic
third
part
ly a
of
the
of
circuit results in a highly linear operation
of
Circuits consist of: A master oscillator
carrier frequency;
the
I/18th
at
modulators
a
bring
power
these stages.
and
frequency.
and
,
of
as
The
the oscillator
of
frequency control circuit to be
paragraph.
reactance
for
rrier
the oscillator coil since the required
of
the r-f carrier
pushpull
of
provide
to
reactance
third
output
the
supplies to furnish a-c
a 6AQ5
is
at
me.
six
The
are
the grids, which
modulator
phase with the oscillator place.
an inductive reaccance across the
magnitude
tank
controlled
is
bias
This
modulator,
modulation
. This reactance tube
by
modulator
modulation
modulator
multipliers
frequency up to
a frequency between
depending
,
plates
connected to the
are
grids
the reactive com-
of
coil varies
tor
a
modul
varied accordingly.
is
by the bias voltage
voltage
an RCA
the subcarrier
of
the subcarrier
and
bridge
mounted
of
Hartley
of
are
180 degrees
and
the inductive
type
a full
pins
the chassis
circuit
and
shown
is
including
and
type
upon
the two
in push-
each
with
and
grids,
is supplied
Type
coupled
is
small.
is
on
for
for
d-c
the
is
the
on
www.SteamPoweredRadio.Com
BTE-108 EXCITER CRYSTALS
E-5
Ml
No.*
Carrier
Frequency (
MC)
Crystal
Frequency
(KC)
Ml
No.*
34509-1 88.1 101.9676 34509-51
-2
·3
-4
-5
-6
-7
-8
·9
-10
-11
-12
-13
-14
-15
-16
·17
-18
-19
-20
-21
-22
-23
-24
-25
88.3 102.1991 -52
88
.5
88.7
88.9
102.4306
102.6620 -54
102.8935 -55
89.1 103.1250 -56
89
89
.5
89.7
89.9
90.1
.3
103.3565 -57
103.5880 -58
103.8194
104.0509
104.2824 -61
90.3 104.5139 -62 100.3
90.5
104.7454
90.7 104.9769 -64 100.7 116.5509
90.9
91.1
91.3
91.5
105.2083
105.4398 -66 101.1 117.0139
105.6713 -67
105.9028 -68
91.7 106.1343 -69
91.9
106.3657 -70
92.1 106.5972 -71
92
.3
92.5
106.8287
107.0602 -73 102.5
92.7 107.2917
92.9
107.5231 -75 102.9 119.0972
Carrier
Frequency (
98.1
98.3
-53 98.5
98.7
98.9
99
.1 114.6991
99.3
99.5
-59
-60
99.7
99.9
100.1
MC)
Crystal
Frequency
113.5417
113.7731
114.0046
114.2361
114.4676
114.9306
115.1620
115.3935
115.6250
115.8565
116.0880
-63 100.5 116.3194
-65
100.9
101.3
101.5
116.7824
117.2454
117.4769
101.7 117.7083
101.9 117.9383
102.1 118.1713
-72 102.3
118.4028
118.6343
-74 102.7
118.8657
(KC)
-26
-27
-28
-29
-30
-31
-32
-33
-34
-35
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
-46
-47
-48
-49
-50
93.1
93.3
93.5
93.7
93.9
94
.1 108.9120
94.3
94.5
94
.7
94.9
95.1
95.3
95.5
95.7 110.7639
95.9
107.7546 -76
107.9861 -77 103.3
108.2176
108.4491
108.6806
109.1435
-78
-79 103.7
-80
-81
-82
109.3750 -83
109.6065
109.
8380
-84
-85
110.0694 -86
110.3009
110.5324
-87 105.3
-88
-89 105.7 122.3380
110.9954 -90 105.9
96.1 . 111.2269 -91
96.3
96.5 111.6898
96.7
96.9
97.1
97.3
97.5
97.7 113.0787
97.9
111.4583
·92
·93
111.9213
112.1528
-94 106.7 123.4954
.95
112.3843 -96
112.6157 -97 107.3
112.
8472
-98
-99
113.3102
-100
103.1 119.3287
119.5602
103.5 119.7917
120.0231
103.9
120.2546
104.1 120.4861
104.3 120.7176
104.5 120.9491
104.7 121.1806
104.9
105.l
121.4120
121.6435
121.8750
105.5
122.1065
122.56~4
106.1 122.8009
106.3
106.5
106.9
123.0324
123.2639
123.7268
107.1 123.9583
124.1898
107.5
107.7
107.9
124.4213
124.6528
124.8843
• Suffixes 1
FCC
to
channel
100
designate
275, frequency 102.9 me.
channel
number.
Add
200
to
1uffix
to
get
FCC
channel
number,
e.g., Ml-34509-75
designates
www.SteamPoweredRadio.Com
E-6
MODULATOR-OSCILLATOR
-,
7
CHANNEL
MAIN
AUDIO
INPUT
~---~
EMPHASIS
NETWORK
15,000
30 -
FROM
INPUT
SUBCARRIER
GENERATOR
30-67KC
'
I
I
I
I
6AU6
REFERENCE
I
CRYSTAL
I
I
lcARRIER
ON-OFF
I
LNTROL
PRE-
CPS
AFC
FREQ.
CONTROL
VOLTAGE
OSC
6AH6
DIVIDER
(1/5)
2D2I
OFFDETECTO
_ - -
FREQ
L
---
2-1N34A
DETECTOR
CATHODE
FOLLOWER
MIXER
6CL6
CARRIER
PHASE
l2AT7
6AS6
6AQ5
MOD
6AQ5
MOD
SUB-
MOD
6AH6
DIVIDER
3)
I/
(
6AH6
DIVIDER
/4)
(I
6AH6
DIVIDER
/4)
(i
6AH6
DIVIDER
5)
(I/
6AQ5
MASTER
osc
7
_J
I
I .-----.
5763
FREQ
TRIPLER
I
I
I
I
I
_L
I
I
I
I
I
I
I
I
5763
FREQ
TRIPLER
MULTIPLIER-PA
I
A
I
V
I
L
,--7
POWER SUPPLY
I
VDC
300
+
VDC
.3
+6
I
6 .3 VAC
I
L _
~~I
6146
DOUBLER1+----<
PA
._____,I
_J
I
I
I
_J
I
I
I
_J
I
RF
OUTPUT
88-108
I
I
I
I
MC
harmonic
low
very
with
reactance,
pure
a
almost
greatly
is
Moreover,
balances
Modulating
thus
main
the
reduced,
the
temperature
out
circuits
minimizing
channel°
pushpull
possibility
the
and
Figure
disto
loa
and
providing
modulator
s
and
y effectively
ver
are
subchannel,
rti
ding
better
upply
of
Block Diagram,
E-2.
on. Each
oscillator
the
of
AFC
utomatically
a
age changes.
volt
decoupled,
cross-talk
vice versa.
and
is
tube
action.
between
Exciter
FM
OB
BTE-1
Automatic Frequency
a
phase
an
control
automati
frequency
characterized
is
operation.
voltage
lock
derived
the
automatic
The
BTE-10B Exciter
dependable
of
develop
to
maintains
oscillator
actually
is
a
and
Control
control
A
between
signal.
.c phase
circuitry
long
by a
detector
phase
which establishes
a reference crystal
the
Thus
control
system which
the
of
record
used
is
and
system
www.SteamPoweredRadio.Com
Cl98
E-7
INPUT
CONTROLLED
REFERENCE
FREQ
FREQ.
?JI
-
TO
REACTANCE
GRID
MOD
.
T
111
CONTROL
1N34A
1N34A
VOLTAGE
CI04
I
C 188
Cl89
Cl87
----
Rl68
~
+
Rl69
Rl70
+
-
Ll08
K IOI
1
CONTACTS
Figure E-3. Simplified Schematic,
achieves a stability precisely
crystal reference
the master oscillator signal
of
tions
the phase detector,
of
possible speed
circuit, the master oscillator frequency
must be reduced.
oscillator type dividers
Thus
240.
lowest audio frequency
± 100 kc deviation
within
precise frequency
an
the limits
limited pull-in
The
off-frequency circuit which extends the pull-in
± 400 kc
to
range
taneously provides a
possible off-frequency
and
Circuits
Figure
2.
sourcf.:.
the
of
This
maximum
the
of
linearity
of
control
(at
AFC
the
of
A small r-f
and
low
the
range
the final
safeguard
voltage
matching
confine
To
order
in
network
pass
accomplished in locked-
is
overall division
an
with
phase deviation
cps) is ± 58 degrees
(30
frequency),
final
the phase detector.
of
normally
is overcome by the use
frequency),
against
operation
system are
is fed
that
phase devia-
the
within
to
to exceed the
not
in
and
associated with
and
uncontrolled
.
diagrammed
the
from
of
the
swing
at
and
simul-
master
the
range
AFC
of
the
(at
well
of
in
Phase
OB
BTE-1
oscillator circuit to the divider chain where
divided by 240
that,
noted
be
modulation
± 20 cps.
to
through
ploying
same frequency, fed
the
obtained
reference crystal oscillator.
Operation
the simplified
diagram
lator
applied
10
Tl
90 degrees
but
signal
across the
by vector BA
across the
is reduced from a
cathode
a
two
by
Figure
of
exactly
is
its
to
Tl
and
applied
is
top
lower
Detector
a
to
the
at
the
From
follower
IN34A
dividing
the
of
diagram
4. Assuming
frequency,
on
the
,
grid
therefpre
11
of
out
Tl
to
half
Figure
in
half
It
kc.
25
20 to
of
range
same time, deviation
maximum
dividers, this voltage
a phase detector em-
to
diodes. A reference voltage
phase detector,
the
into
by five the frequency
phase detector
Figure
of
two
phase.
10,
the
of
represented by vector BC.
is
3,
that
no correction bias
with
signals applied
input
the same frequency
of
are
reference frequency
The
the voltage developed
and
secondary is represented
while
,
(a)
4
of
illustrated in
is
the
by
and
the master oscil-
the voltage
it
should
to
due
± 5 kc
fed
is
of
the
of
vector
is
is
to
www.SteamPoweredRadio.Com
E-8
voltages are
two
These
phase.
of
degrees
signal
across its secondary
which
other
crystal rectifier
RI
E,
E,
Rl
Hence
R 169 to
should
signals
shown
is
Rl69
positil'e
R 169 will
correcting
lator
ships
negatii-e
tube
phase
stantaneously
High
filtered
C 188
out
to
pplied
a
is
90 degrees
is
voltage
The
two.
and
the
then
is
70)
E, respectively. Since
and
E, are equal,
and
70 will be equal
voltage
the
,
ground
If, however,
decrease,
and
in
greater
now
will be
correction
frequency
change
correcting
grid.
relationship
frequency
out
and
will
the
the
vector
their
Figure
the
C 189
4
than
greater
applied
be
frequency.
should
shown
as
any
Thus
corrected by a
components
the
of
and
magnitude
in
equal
controlled
The
the
and
11,
Tl
represented
is
phase
of
out
impressed across each
its associated
\'ector sum
d-c voltages across
the
and
as measured
zero.
be
frequency
relative
(b).
that
than
voltage
to
increase,
in
voltage
departure
between
control
choke
the
of
the
the
of
the
of
phase
relationships
the
Since
the
E,,
of
across R170
that
appearing
reactance
the
Accordingly,
the
Figure
applied
is
from
two signals
the
proper
the
of
voltage
L 108.
and
frequency
voltage
with
load
the series vol
from
of
magnitude
d-c
4
input
by
developed
vector
by
of
each
1N34A
(R169
magnitudes
69
RI
the
two
change
and
the
tube
the
if
and
reactance
the
90-degree
voltage
signals
capacitors
shown.
top
of
across
top
a
is
polarity
master oscillator
the
will
voltage
at
vector relation-
(c),
to
the
error
the
180
BD.
the
and
es
tag
of
and
of
input
as
E,
net
a
of
grid,
oscil-
net
in-
are
.
network
The
resistor R 168
and
98
CI
phase
the
difference
feeding
by
back to
then
both
in
The
the
to
grid;
out
C 187
tor
capacitor
master
automatically
in a
If
there
quency
changed.
detector
symmetrical
polarity
oscillator
To
developed,
the
of
T
at
0.1 kc will be
of
limit
the
causes
directions
amount
amplitude
in.
and
objectionable
is
(198
oscillator
paragraph.
later
signal
the
will be
of
However,
output,
change
to
toward
illustrate
take
master
which
111
capacitors
consisting
detector
that
small
a
reactance
master
the
at
frequency
of
of
to
der
_
or
audio
small
made
which
"hunting."
is
the
by
the
at
d-c
no
master
the
the
when
has a d-c
and
the
its
the
how
example
an
oscillator
0.1 kc low. A difference frequency
is
fed
of
control
extends
beyond
would
amount
tube
oscillator frequency to
the
signal
the
produce
frequency feedback, capaci-
and
switched
is
off-frequency
reactance
component
oscillator
beat
it
mean
correct
non-symmetrical
such as to
is
the
to
the
± 90
the
otherwise
beat
the
of
beat
This
grid.
difference frequency rate.
deviation
is
The
tube
frequency
not
is
component
frequency
frequency.
in
reactance
is
the
at
sufficient
paralleled
only
in
switching
detector
grid
and
will
locked in, is non-
which
produce
tube
(104, (187,
range
degree
reactance
is sinusoidal,
the
at
of
of
waveform
the
phase
imposed,
be
frequency
frequency
swing
proportional
with-
swing
larger
by a
when
done
is
described
mean
remain
phase
the
proper
the
master
the
frequency
a signal
grid,
of
tube
the
fre-
un-
is
and
A
----,1:EI
/ I
/ I
B
'
'
----~E2
C
/ I
/ I
'
,1
'
(a)
El
----~
- I
I
I
I
I
I
I
I
I
I
I
D
I
I
D
A
B
I
"
'
I
C C
-
'
-
,1
......
I
E2
~
A
B
........
_,,/
\
\
........
/
\
\
):
'
/I
\ I
El
I
I
I
I
D
',\I
......_~E2
Figure
E-4.
Phase
(b)
Detector
(c)
Signal Voltages
www.SteamPoweredRadio.Com
E-9
master
the
the
The
the
of
junction
this
If
through
would
line
longer
no
The
Figure
frequency swings
and
its
approaches
increasingly slower,
produced.
of
is
frequency
Figures 5
except
the
becomes
creasing d-c
be
the reactance
for
d-c
beat
zero.
voltage
oscillator
frequency
tuned
dashed
correct
produced
component
line curve
frequency
beat
L 108
of
waveform
blocking
a
appear
waveform
represents zero d-c voltage.
positive
(a)
5
negative peak
the
frequency. As
the
The
polarity
such
toward
the
for
beat frequency becomes lower, the
greater,
desired
the
frequency
system
The
maintains
will
hundred
one
Figure
of
which
68
RI
and
was fed back to
capacitor,
same
the
at
slightly
is
of
peak
produced
is
further
reference frequency,
and
componen
d-c
as to
correct
its
through
(b)
frequency
producing
component.
blocking
by
and
tube
frequency.
beat
fed to
is
automatically
then
is
that
the
point.
distorted
solid
the
as
away
produced
is
the
the
t
change
frequency.
d)
(
of
The
the
tuning
by
the
"locked
condition.
if
distorted
the
waveforms
reactance tube
swing
then
above
times
the
is
(a)
5
would
produced
a
appear
C 104 were
reactance cube
the
line
solid
chat
Note
so
waveform
line
master
the
its frequency,
from
it
as
lled frequency
contro
beat becomes
the
master
the
the
are
Note
beat.
corresponding
component
d-c
master
the
However,
decreases
in'"
below
and
second.
per
waveform
at
shorted.
waveform
solid
the
its axis
that
oscillator
approaches
waveform
CI
across
oscillator
same as (
chat as
distortion
shown
from
oscillator
when
grid,
until
the d-c
and
the
it
in
is
04
a)
in-
can
the
the
Off-Frequency Detector
Protection
frequency
operation,
circuit
which
shown
by-passed by capacitor
pedance
the
of
the
in
When
no difference frequency
is
therefore
reason a difference occurs in
quencies, however,
ponent
thyratron
the
this
of
applied
bias
ducts,
of
set
mitter
being
normally
(
C 198,
described.
Sensitivity
bias resistor
tron
the
is
that
thyratron
the
cause it to fire.
against loss
control
provided
is
in
shown
fed from
is
Figure
in
the
to
beating
output.
master oscillator
the
output
the
appears
grid
alternating
to
energizing
contacts on relay K
interlock
applied
open)
of
modulating
low
in Figure
shown
system,
by
6.
Figure
last
the
The
2.
CI
beating
frequencies,
across
the
circuit,
to the PA;
the circuit
but
frequencies
the
of
the
the
resistor R 172.
voltage
thyratron
KIOI.
relay
preventing
switches in
174.
R
that
so
automatic
the
control
of
and
the
15
VI
divider
plate
93, which
eliminating
produced
stage
difference frequency com-
plate
exceeds
10
another
for
3,
is
This
frequencies will
the
by
possible off-frequency
off-frequency
a 6AS6
is
in each chain
of
load
and
frequency there
on
is
zero.
is
two
the
and
load
the
If
the
16,
VI
(normally
One
operates
I
plate
set
feedback capacitor
the
purposes
adjusted
adjustment
beat frequencies will
detector
stage
mixer
the stage
a low im-
is
the
to
these signals
in V 115,
for
If
beating
hence across
positive
cathode
fixed
tube
the
closed)
trans-
the
from
power
contacts
of
previously
thyra-
the
by
set so
is
trigger
not
sum
and
half
con-
any
fre-
as
is
I \
I
:\
\ I
~
\ l
( 0)
'
V;
\
' I
\ l
(b)
Figure E-5.
'
100'\i
\
\
50'\,
Phase
(c)
(d)
Detector Output Waveforms
www.SteamPoweredRadio.Com
E-10
V115
=
CONTROLLED
FREQ
.
REF
FREQ
Figure
Carefully
make certain
ing
shipment.
immediately
tion
company
may be recovered.
The
tainer,
separately.
only
external
and
connected
Reference
gram
of
wiring
A-C Power Line Connections
The
the
filament
operation
phase a-c lines.
unpack
that
reported
in
equipment
excepting
All
cables
should
this
book
to
be
used
primaries
transformer
from
no
Any
damages
order
is
tubes
internal
to
the
be
made
which
and
of
the
either
The
and
inspect
damage
or
to
RCA
that
lost
shipped
and
crystals
wiring
and
wiring
equipment
to
the
designates
the
proper
plate
transformer
(TI
14)
120-volt
equipment
has been
and
complete
is
C
193
V116
-
B+
E-6.
Simplified Schematic, Off-Frequency Detector
INSTALLATION
the
equipment
incurred
shortages
to
or
damaged
which
done
need
interconnection
connections.
are
or
is
shipped
should
the
transporta-
in
one
are
at
the factory,
be
prepared
at
installation.
the
cables
(TI
each
tapped
240-vo lt single-
with
to
dur-
be
material
con-
packed
diaand
13)
and
for
the
taps set
rnllllffled
care
are
Reference
diagram
for
110/
l'Olt
"Power
luad
The
in
by
near
should
TAL
for
must
made
and
making
to
disw1111ect
ten11i11al
The
a-c
Off-On"
switch
connections
the
overall
Tubes
should
reference
the
appropriate
be
I"
and
TO
FIL
TRANSF.
240-volt
011ly
to a 120-t·olt
be
taken
before
power
should
be
to
the
connections.
T
s
-I
(IIJl/
overload
switch,
( S 103)
of
schematic
be
to
the
inserted
"CRYSTAL
KIOI~
---s£l!
Tll2
use.
The
crystal heaters
a-c
source.
to
insure
that
proper
is
applied
made
table
Tramfor111er Primary
/ /
2-10
ll
2 ( black leads) f
2
of
T 113.
switch ( S 104) can be used
if
desired,
for
"Standby"
these circuit-breakers are
diagram.
inserted
type
number
sockets. Crystal
into
the
2."
co
the
/'()Ifs
in
their
designations
sockets
to
overall
and
connections
the
equipment.
is
wed,
ro111
the
plate
proper
Units
marked
Particular
schematic
d-c u,·er-
switching.
MI-34509
0:
UJ:,,:
I-
u
t: 0
::E
.J
(/)
0:
zW
<I'.
I-
0:
~
I-
11111st
Tap.1
b1:
S1tr1:
th
1:
120-
as
shown
sockets
printed
''CRYS-
b1:
a
Power
Taps
Line
to
be
Voltage:
Used:
TRANSFORMER PRIMARY TAPS
106 117
2-4
3-4
---------------
Tap C of
"AC
OVERLOAD"
Circuit
128
1-4
Breaker
208
197
3- 5 2- 5
I
I
"AC
Circuit
219 229
1
-5
3--6
Tap B of
OVERLOAD"
Breaker
240
2-6
251
1-6
Loading...