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Oct. 29, 1946.
I
’
J. F. HUTCHINS ETAL
2,410,075
RAPID FREQUENCY CHANGE RADIO RECEIVER
Filed Jan. 31, 1944
IAN/EN 'rons
- J‘IMEs EHUTcH/NJ
III
MAL/AM A’. "(V/7'45, J7:
dirio’elvgy
2,410,075
Patented Oct. 29, 1946
“ UNITED ' STATES PATENT oFFlcE
» 2,410,075
7 '
1'
V
RAPID FREQUENCY CHANGE RADIO
-
RECEIVER
-
-
James F. Hutchins and William‘ K. White, Jr.,
San Antonio, Tex.
Application January 31, 1944, Serial No. 520,458
4 Claims. (Cl. 250-—'20)
~-(Granted 'under the act of March 3, 1883,‘ as
amended’April 30, 1928;"370 O. G. 757)
1
,
sistor ll,ithe plate of triode A assumes a like
negative potential below ground as thereyis no
The invention described herein may be manu
factured and used by or for the Government for
current ?owing between cathode and plate._ The
plate of triode A is connected directly to the grid
governmental purposes, without the payment to
ine of any royaltythereon.
'
‘
I
‘ This'invention' relates toimprovements in ra
dio‘. receivers‘ subjected to rapid frequency
changes.
.
"
'
‘
Cr:
of tube M, which is simply a voltage phase in
verter. A ?xed condenser 15 connected to the
plate of triode A will rise and fall in potential in
the same ‘manner as the potential of the plate or‘
triode A rises and falls. Its action in so far as
causing the receiver .to lock on'a de?nite fre
It is‘ van object of ;the' invention to provide a ‘
radio receiver having means to convert into intel
ligible reception’ 9, carrier wave which skips or 10 quency of incoming signal will be hereinafter ,de-_
sweeps‘ from one frequency to another ‘in a, man
'
'p
_
her not necessarily predetermined but which is _. scribed.
‘The outputvolta'ge of inverter tube‘ l4 isjoorl-l
'modulated, by pulses ‘of a'predeterminedj pulse
rate and a predetermined pulse‘width?;
_ ,
A, further objectis the provision of a radiolre
ceivercapable' of, opening itself to the reception
of transmissions of the above mentioned type to
the exclusion'of other types.
'
nectedto the grids of, a'twin triode tube-V l 6, which
‘functions. in the same manner as two variable
resistances.v The conventional part of the re
ceiver employs a multi-vibrator oscillator tube’
l1 associated with the ?rst detector 2; The fre
‘
quency'of this multi-vibrator tube l1 can be con
These and other i'ob-jects are‘attained by the‘
trolled by varying the values of the two grid bias
novel circuit: and arrangement ‘of-‘parts, herein 20 resistors connected to the two grids of the tube.
after described and illustratedv by the accom
It'is apparent that if these resistances can be
made to vary simultaneously with the varying in
panying drawing, formingv a part‘hereof, and in
which is shown‘ a‘ ‘schematic diagram'of the cir
cuit employed.
,
.
frequency of an incoming signahthe receiver can
be made to follow instantaneously any incoming
signal‘that jumps from one frequency tofanother.
‘
,_ Referring‘ to thedrawing, the receiver is shown
to include a conventional section comprising a
stagel of radio frequency, a ?rst detector 2, three
In order to accomplish this, the plates and cath
odes of tube l6 areconnected, as shown in the
stages, 3, 4, 5, of ‘intermediate frequency, and
diode ,second'detector B.
_ '
’
. 1
Audio signal voltage is .takenat 1 from the sec
diagram, to the multi-vibrator oscillator tube ll
30 in such a way as to cause the plates and cathodes
of tube Hi to act in the manner‘of a variable re
ond detector 6 in a conventional‘ manner, and is
sistance when connected in parallel with the grid
bias resistance of each triode portion of the oscil
applied to the grid-ofthe ?rst audio tube 8.
The cathode of tube'8 is not at ground'poten'tial
but is connected to the .plate of an audio blocking
tube 9. The cathode of audio blocking tube 9 is
at ground potential, and its grid is biased to just
below‘ cut-off so that plate current will ?ow in
tubes 8 and 9 when a positive voltage is applied
to the grid of tube 9.
_
lator tube I1. Varying the cathode to plate re
sistance of tube US will cause the oscillator tube
H to produce a corresponding change in oscil-_
lator signal frequency, and cause the receiver to
sweep a band of frequencies. Brie?y stated,the
receiver is made to sweep a band of frequencies
> .
by- the near-sine wave output voltage of the mul
ti-vibrator tube I0 applied to tube l6 through
sweep voltages includes a twin triode tube l0 used
the locking tube l3 and phase inverter tube l4,
as a multi-vibrator to produce a wavesimilar to
causing a change in grid-bias resistance in each
a‘ sine wave. This multi-vib-rator tube ID will
grid-cathode portion of the oscillator tube 11.
produce waves other than near sine-waves, but
As mentioned above, the receiver. among other
45
it has beenv found that a near-sine wave is the
things, will receive a pulsed signal only. The
type best suited for. this receiver. The frequency
“pulse discriminator” section of the receiver be
sweep voltage produced by multi-vibrator tube l0
gins with the negative automatic volume control
and the associated circuit is impressed across a
taken
from the diode detector 6. This negative
resistor ll, of approximately one megohm, con
nected between ground and cathode l2 of a twin 50 voltage is impressed upon the grid of triode C of
a twin-triode discriminator tube 18. The word
triode locking tube l3. The triode including
discriminator has been chosen as the name of
cathode 12 will be hereinafter designated as tri
The portion of the receiver which produces the
tube 18 as its action causes the receiver to dis
criminate between a pulsed and a non-pulsed
ode A, and the other triode as triode B.
During the negative half-cycle of the sweep
voltage impressed across the one megohm re
55
signal. The positive voltage pulses produced on
3
2,410,075
4
the plate of triode C of tube [8 are fed to the
grid [9 of triode D of the tube. This grid I9 is
biased su?iciently beyond cut-off so that only the
to cause the receiver to sweep over a band of
frequencies, means associated with the second
detector to operate only upon the reception of
pulses of predetermined frequency and ampli
tude, and means affected by the operation of said
peaks of the positive voltage produced by the
plate of, triode C will allow plate current to ?ow
in the plate of'triode D. It is, therefore, the ac
tion of discriminator tube l 8 to‘ allow output plate
voltage in triode D only during large peaks pro
duced by the pulsed negative voltage audio sig
last; mentioned means to‘render the second mul
ti-vibrator ineffective and lock the oscillator at
,
a de?nite frequency.
2. A device for converting into intelligible re
nal impressed on the grid of triode' C. These 10 ception a carrier wave sweeping from one fre
pulsed voltages are fed from the plate of triode
quency to another in an inde?nite manner and
-D of tube IE to the two grids of the locking tube
I3, causing plate current flow to cease in both
modulated by pulses of a predetermined pulse
frequency and amplitude, comprising a conven
sections of the locking tube l3, thereby removing’
tional type of super-heterodyne radio receiver
the near-sine wave voltage of the'multi-vibrator' 15: circuit including a, ?rst detector, an oscillator
tube l9 from the oscillator tube I1. This causes
tube connected to said ?rst detector, a multi
the oscillator tube ll to stop varying in fre
vibrator producing a near-sine wave voltage, a
quency, and therefore, causes thezreceiver. to lock
triode tube upon which said voltage is impressed,
on the incoming signal if the voltage produced
said‘ triode tubebeing connected to the oscil
by the multi-vibrator Hi can be maintained at
lator tube to vary the grid-bias resistance of the
the point it had reached at the time the locking
oscillator tube to cause the oscillator to follow
tube I 3- was blocked out of. the. circuit. This is
the wavecf. the multi-vibrator and cause the re
accomplished by. means of the?xed condenser
ceiver to sweep over a band of. frequencies, a dis
l5lwhichv is connectedbetween ground and the
Dlateof triode A.ofv tube I73.’ Thiscondenser has
been-rising and falling in. charge as. the multi
vibrator. near-sine wave voltage has been rising
criminator tube connected to said circuit to oper
ate only upon the reception of. pulses of a pre
determined frequency and amplitude, and means
to render the multi-vibrator ineffective and lock
the oscillator at a de?nite frequency when said
and . falling. inv value, and. has been. discharged by
electrons leaking. 01T- to ground through triode B
of tube- l3. The. charge of'the. condenser can .be
maintained by» blocking this. leak. off‘ path. The
discriminator tube is placed in operation.
3. In a device for receiving pulses of‘a prede
termined repetition rate and amplitude, a radio
circuit, an oscillator tube connected to. said. cir
leak o? path is blocked by the output plate volt:
ageof;discriminatortube l8 causing the gridi-of
- cuit, ,'a- second tube connected, to the. oscillator
triode Bof tube I3Ito. become strongly negative.
tube and?adapted to function as a variable re
The condenser IE is. now', required to maintain its ‘
sistance, a multi-vibrator producing, a voltage
having- a predetermined wave shape, a locking
tube connected‘to the multi-vibrator, a phase in
verter connected to the locking tube and second
charge, and it will cause the grid'bias of the volt
age phase‘inverter- tube M,- and irrturn the volt
age impressed on tube It‘, to. be maintained, which
?xes theirequency of the oscillator I]; and causes
the entire. receiver to lock.on.the incoming signal. 40 tube to cause the second tube to. act as a variable
resistance. and'vary the grid-bias of theoscillator.
The receiver described abovevvill receive radi
tube
to cause the receiving circuit to sweep over
ationsthat are pulsed and that vary infrequency.
a band‘ of’ frequencies,.a discriminator tube con
The receiver sweeps a. band of frequencies, and
nectedt'o. the circuit and arrangedto operate only
will open. itself up. only. to. a. carrier with ex
tremely. ‘high amplitude pulses. . This presents
twochangesfromthe conventionalitypes of radio
upon‘ the‘ reception of pulses of‘ a predetermined
Cl repetition rate and amplitude, and means con
necting the locking tube and discriminator tube
to discontinue the operation of thelocking tube
communication. The ?rst change is in the use of
atransmitter that varies rapidly in frequency in
and lock" the device at a de?nite frequency when
an unpredeterminedmanner and in.having are
tube is placed‘in operation.
ceiverv that. will sweep the frequency band in 50 the4. discriminator
A device for receivingpulsedradio frequency
which. the. transmitter is varying ‘and receive
signals of predeterminedrepetition rate, and am
thesetransmissions and convert them into intel
plitude which sweep rapidly over a band of dif
ligible signals. The secondchange is inhaving a
ferent carrier frequencies, comprising asuper
transmitter. that transmits. pulses of predeter
heterodynereceiver including a ?rst detector, an
mined. frequency and having a receiver that will
C-: in oscillator connected to said ?rst detector, means
discriminate. in- suchmanner as to receive these
including a. second oscillator to vary said ?rst
"pulses. only to-the exclusion of other signals.
The invention having been described, what is
claimed is:
1'. In a receiver for receiving radio signals
which sweep rapidly. over a band of different fre
quencies, a conventional super-heterodyne radio
oscillator to cause the. receiver to sweep over a
band‘ of carrier frequencies, means to cause said
receiver to become operative to produce a signal
output only upon the reception» of pulses. of a
predeterminedv repetition rate. and amplitude,
receiving circuit having‘a ?rst detector and a
second detector, a multi-vibrator oscillator con
nected to the ?rstv detector, a second multi-vi
brator'pro'ducing a, near-sine wave voltage, means 65
and means conditioned by said last mentioned
means to render said second oscillator ineifective
and to lock said ?rst oscillator at a de?nite car
controlled‘byv said’ voltage to affect the oscillator
‘
rier frequency.
JAMES F‘. HUTCHINS.
WILLIAM K. WHITE, JR
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