US2616039A - Self-quench superregenerative receiver - Google Patents

Self-quench superregenerative receiver Download PDF

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Publication number
US2616039A
US2616039A US788765A US78876547A US2616039A US 2616039 A US2616039 A US 2616039A US 788765 A US788765 A US 788765A US 78876547 A US78876547 A US 78876547A US 2616039 A US2616039 A US 2616039A
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quench
circuit
receiver
self
anode
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Richman Donald
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Hazeltine Research Inc
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Hazeltine Research Inc
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Priority to US788765A priority patent/US2616039A/en
Priority to GB27537/48A priority patent/GB646331A/en
Priority to CH270714D priority patent/CH270714A/de
Priority to FR975353D priority patent/FR975353A/fr
Priority to DEP22739D priority patent/DE807631C/de
Priority to ES0186086A priority patent/ES186086A1/es
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D11/00—Super-regenerative demodulator circuits
    • H03D11/02—Super-regenerative demodulator circuits for amplitude-modulated oscillations

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  • the present invention is directed to self quench superregenerative receivers adapted ior operation in'the saturation-levelmode and, particularly, to such receivers having operating Characteristics which are stabilized with respect to variations of the operating conditions to which they are normally' subjected in operation
  • Superregenerative receivers of both the separately quenched and the self-quench type have found Wide utility due to their exceedingly high sensitivity, extreme simplicity and inexpensive construction.
  • the operating characteristics of many such receivers may, however, become quite unstable with variations of the operating conditions to which they are normally subjected in operation.
  • the variations of the value of the conductance of the resonant input circuit of the superregenerative receiver due to antenna loading thereof, changes in the value of the receiver circuit components due to aging, changes of the transconductance of the regenerator tube over the operating life thereof, variations of the energization of the receiver circuit, and tuning of the receiver from one wave-signal station to another having different wave-signal intensities may materially alter the operating characteristics of the superregenerative receiver.
  • Superregenerative receivers of the separately quenched type and characterized by relatively high stability of their operating characteristics have been proposed to avoid some of the foregoing difiiculties.
  • One such receiver employs a time-constant network in the input circuit of the regenerator tube thereof for developing therein a bias potential which is adapted to maintain the average anode-current pulse width substantially constant with variations of operating conditions to which the separately quenched superregenerative receiver is subjected.
  • a self-quench superregenerative receiver yet it is usually further desirable that the receiver have high stability of its operating characteristics with respect to changes in the operating conditions experie enced thereby.
  • a receiver of this type exhibit certain other particular characteristics, such as controlled selectivity independent of the quench rate, which is notinherent in the usual self-quench superregenerative receiver. These requirements are (iii: ficult to obtain in a self-quench superregenerative receiver for reasons which will be stated hereinafter.
  • e aratel quench d uper s ne i e r c i r the sel cti i is ord ar l e ne b the wave form of the quench voltage applied thereto and particularly by the wave form in the vicinity of maxirr um sensitivity.
  • the desired Wave form may usually be secured by suitable de-- sign and adjustment of the quench-voltage generator.
  • a self-quench superregenerative receiver develops its own quench voltage, however, and the attainment of a quench voltage having a particular Wave form is considerably more difficult in this type of receiver. Any selection or adjust-.
  • Superregenerative receivers of both the separately quenched and self-quench types, characterized by high stability of the operating characteristics thereof over a wide range of variations of operating conditions are disclosed and claimed in th copending application of Bernard D. Loughlin, Serial No. 753,236, filed June '7 1947, entitled Superregenerative Receiver and 2.5-, signed to the same assignee as the present invention.
  • the superregenerative circuits or these receivers employ a regenerator tube having a timeconstant network degeneratively included in a circuit portion common to the input and output circuits Of the, tube., This network is efiective the self quel ch type of circuit, for example, to maintain the average self-quench periodicity of the superregenerative receiver substantially constant.
  • Each of the anode-current pulses comprises two portions.
  • the first portion has a relatively low amplitude and usually a substantial duration and occurs during the oscillatory buildup interval, while th second portion has a considerably greater amplitude and ordinarily a much shorter duration and occurs during the saturation-level interval.
  • the integrated values of these two portions determine the average value of anode current for any given value of selfquench frequency.
  • each anode current pulse may vary both in amplitude and duration. Accordingly, under some severe operating conditions this variation of the shape or area of the first portion of each anode-current pulse may represent a considerable part of the total value of each anode-current pulse.
  • the average value of the anode current of the regenerator tub of the receiver may not tend to change sufficiently with the changes experienced in the operating conditions to develop the necessary control effect across the degenerative timeconstant network for maintaining the average self-quench periodicity of the superregenerative receiver substantially constant.
  • the previously described arrangement of Bernard D. Loughlin which derives its stabilizing action from the anode-current pulses flowing through the regenerator tube, includes an impedance in the anode-energizing circuit which reduces the voltage applied between the anode and the cathode of the tube.
  • an impedance in the anode-energizing circuit which reduces the voltage applied between the anode and the cathode of the tube.
  • the available voltage between the anode and the cathode of the regenerator tube be as large a proportion of the total anode voltage as possible.
  • the abovementioned impedance therefore, limits the degree of stabilization which may be obtained in the previously described arrangement.
  • a self-quench superregenerative receiver comprises a regenerative circuit adapted to have a modulated wave signal applied thereto and including a regenerator tube having anode, cathode, and control electrodes.
  • the receiver also includes an electrical time-constant network coupled to the cathode electrode and having a periodic potential developed thereacross in re sponse to an electrode-current flow of the regenerator tube for effecting periodic self-quenching of the regenerative circuit to provide superregenerative amplification of the applied wave signal.
  • the parameters of the regenerative circuit and the electrical time-constant network are so proportioned that the oscillatory amplitude of the circuit extends to a saturation-level mode of operation thereof during an interval of each quench cycle.
  • the receiver also includes an electrical time-constant network having atime constant longer than that of the first-mentioned network coupled in circuit with the regenerative circuit between the control electrode and the cathode electrode and responsive to control-electrode current of the regenerator tube flowing only during the saturation-level intervals to develop across the second-mentioned network for appli cation to the control electrode a gain-control potential eifective to stabilize the operating characteristics of the receiver against operating conditions which tend to modify the average selfquench periodicity of the receiver.
  • the selfquench superregenerative receiver further in eludes means coupled to a predetermined pair conditions of operation to which it is normally subjected in operation.
  • Fig. l is a circuit diagram, partly schematic, representing a complete self-quench superregenerative receiver embodying the present invention in a particular form; and Fig. 2 comprises graphs utilized in ex plaining the operation of the receiver.
  • the self-quench superregenerative re.- DC comprises a regenerative circuit 10 including a regenerator tube ll having an anode, a cathode, and a control electrode.
  • the regenerative circuit [0 includes an input circuit l2 coue pled to the control electrode of the tube II and shunted by a damping resistor l3.
  • the input circuit I2 is tunable by an adjustable inductor l5 which is coupled to an antenna system [6.
  • the feedback of energy from the output circuit to the input circuit of tube I l to produce regeneration is provided by a windin l8 included in the-oath;- ode circuit of the tube II and coupled to the inductor l5.
  • 'lEhe switch .20 will be referred to as having two operating positions for the switch blade thereof designated a and b for reasons which Will be made more apparent hereinafter.
  • have values so selected that in one of the operating positions of the switch 20, namely the position b, the network comprises a self-quench means for developing a voltage thereacross to effect periodic quenching of the regenerative circuit l8 and thereby pro.- vide superregenerative amplification of a modu-v lated wave signal applied to the input circuit l2.
  • the anode of the tube II is connected to a source of energizing potential, indicated as +13, through a resistor 22 and a radio-frequency choke coil 14 and is also connected to ground through a condenser 25.
  • the choke coil M has a small impedance to signals of quench frequency.
  • the resistor 22 and the condenser 25 are represented as being adjustable in order that it may have somewhat different values depending upon the type of self-quench operation desired for the superregenerative receiver.
  • the condenser 25 is quite small so that the potential thereac 'oss may vary suiiiciently to provide the proper quench-voltage wave.
  • the condenser 25 has a larger capacitance than with the anode-circuit type of self-quench operation.
  • the condenser 25 must also be of suflicient size to constitute a by-pass condenser for the modulation components of the applied wave signal when the audio-frequenc componentsoi the wave signal applied to the superregenerative receiver are to be derived from the control-electrode circuit of tube l I, as will be described subsequently.
  • the condenser 25 is somewhat smaller in size so as not to comprise a by-pass condenser for the modulation gompenents.
  • the resistor 22 in each instance, is proportion d to provide self-quench operatiqii il the anode-quench circuit arrangements or to provide the proper energizing potential for the re:
  • the elf-qu n u s eeeh rsti s receiver a s includes another electrical time-constant network 27 adapted selectively to be included in the" control-electrode circuit of the regenerator tube II for effecting control-electrode circuit selfquenching.
  • i he eesne ative receiver further nclude ano her electrical time-constant etw rk .3 wh ch s re oh e to the control-electrod cu ent .flo z he re n du in the satura on-level in ervals of hereceiver t deve an app y to the c t ol e ect ode of tu e 1 ssainecon roi pote t ef ectiv t sta ilize th perat n characteri ti s he re eiver a st op rat n onditio s which t nd to modify th aver e selfquench periodicity of the receiver.
  • This network m rises the resistor 32 an a c nde ser 8, th
  • a ter be n connected between the juncti n of 1 ff c th cont o ele rode-cat de ias dur n the next quench cycle.
  • the condenser 38 ordiinarily has a su fic ent y l r e cap c tha it as-a low impedanc for urrent of modulationsignal frequencies to prevent a degenerative-action with respect thereto, that is, a capacitance sumoiently la e tha the b as volta e d p d thereacross cannot change appreciably with dynamic changes of control-electrode: current result n fr n d nam c ha g s of s f-qu nch fr quehoy hi h n turn a e cau d b the amp itude modulation gt a received wave signal.
  • the condenser 38 preferably has a large value of capacitance when the switch blade 30 is toengage swit h conta t h b t m y h a bly ma ler e le hen the sw h is to engage h r of the switch on a ts h or o f r reasons h, will become more apparent hereinafter.
  • Th superregenera-tive receiver further includes means ri ed to a f q i noh net f r rivi; g th mod tion components of a wave sigei ap i d in the ned in u c r uit A tho this m an he cou d to an o th fl l 1 h netwo s, f r s mp ty nl two such e sl n arrangem n are re es n ed.
  • - Qhe arran em n comprises a s e-1 pole double-throw switch 4
  • the siviioh ii inst. m ntioned inc udes a mo abl blade 52 adapted selectively to engage the aforementioned switch contact c, a neutral switch contact a, and a switch contact b wherein the resistor 29 is short-circuited and the quench-frequency determining action of the network 2'I is prevented.
  • the oscillations in the input circuit 12 continue approximately at this am plitude level during the saturation-level interval i1-tz of the superregenerative circuit.
  • the duration of the last mentioned interval is determined by the time required for the network 2 I to develop thereacross from the anode-current pulse a bias potential sufiicient to bias regenerator tube II td anode-current cutoff.
  • the saturation-level interval is established by the time required for the condenser 24 to charge to the value where it produces anode-current cutoff in' tube I I.
  • the tube I I is biased to cutofi and the amplitude of the oscillations in the tuned cir-' cuit I2 decreases exponentially to reach at time t3 their original amplitude E as shown by curve A.
  • begins to discharge through the resistor 23.
  • the duration of the discharge interval tzf-tg is es: tablished by the time required for the condenser 24 to discharge sufficiently to permit the regenerator tube I I again to become conductive and initiate a new cycle of operation similar to that just described.
  • the envelope of the oscillations developed in the tuned circuit I2 during the cycle of operation just described is represented by the solid-line curve B of Fig. 2b.
  • the anode-current now through tube II is of somewhat irregular pulse wave form as represented by the solid-line curve C of Fig. 20. It will be noted that the anode! current pulse comprises a firstportion P1 of rela'-' tively low amplitude which occurs during the build-up interval to-t; andasecond portion P2 of relatively large amplitude occurring during the saturation-level interval h-tz.
  • the self-quench period of the superregenerative receiver comprises the sum of the oscillatory build-up interval to-ti, the saturationlevel interval 231-732, and the discharge interval t2-t4. It will be manifest that if any one of these three intervals changes, the quench period varies accordingly.
  • the saturation level of the super; regenerative circuit has an approximately constant value, since it is established by the receiver parameters, and thus determines the amplitude of each pulse of anode current.
  • the saturationlevel interval Iii-t2 may be considered as approximately constant in duration since it is established by a constant amplitude anodecurrent pulse and by the time required for the cathode-circuit condenser 24 of constant capacitance to charge.
  • the discharge interval 162-754 is effectively constant since it is determined by the discharge time constant of the condenser 24 and the resistor 23 of the self-quench network 2I. Consequently, asa first order approximation, the quench period can be considered to vary only with a change in the build-up interval to-ti.
  • the build-up interval efiectively becomes shorter with increasing amplitude of the applied wave signal. This is because the oscillations in the tuned input circuit have an increasingly larger initial amplitude so that smaller intervals of time are required for the amplitude of the oscillations to build up to the saturation-level value.
  • the oscillatory build-up inter val is shortened to the new value i041.
  • This causes the termination of the saturationlevel interval to be advanced to the moment t2 and also the termination of the discharge interval to be advanced to the moment t4.
  • the increased amplitude of the applied wave signal causes the self-quench period of a conventional self-quench superregenerative circuit to be decreased from its initial value 15044 to a new value t0-t4'.
  • the oscillations in the tuned input circuit build up more slowly in amplitude, as represented by the dot-and-dash curve A of Fig. 2a.
  • the solid-line curve" D approximately represents the wave form-of the coritrol-elect'rode current pulses of the tube II for applied wave signals having. amplitudes E and E.
  • the dottedline curvev C represents the waveform of the anode-current pulse f r an input signal having the amplitude E. It will be seen that thecurrent pulse during the saturation-levelinterval is approximately identicalwith that! obtained with an input signal of amplitude EL However, the initial portion P" of the anode-current pulse represented by curveC'" 'has a somewhat lower amplitude value than the'corresponding portion Pi of the pulse of curve C.
  • the electrical-timeconstant network 31 which is responsive to control-electrode current flowing therein only during the saturation-level intervalsof-the regenerative circuit, develops and applies to; thecontrol electrode of theregenerator tube ll again-control potential whichiseifective to stabilize the operating characteristics of the receiver against changes in the average amplitude of theapplied wave signal which tend to modify theave'rage self-quench periodicity of the receiver.
  • the network 31 is effective to control theoperation of the self -quench superregenerative'receiver 'sothat the average control-electrodecurrent andthe average self-quenchfrequency are maintained substantially constant withvariationsof other operating conditions to which the receiver is normally subjected in operation.
  • the gaincontrol potential developed by I the network 31 thus stabilizes the regenerative circuit ⁇ 0 for such operating conditions as variations of the transconductance of the regenerator tube H due to aging, changes in the loading of the tuned input circuit i2 due to the antenna system in, variations of the anode-energizing potential +3, and reduces variations in operating characteristics in different radio receivers due to some component tolerances.
  • the position of the blade 30 of the switch 31 may be adjusted in a manner to determine the degree of stabilization of the operating characteristics of the superregenerative receiverwhich may be efiectedby the action of the network 31. Progressively greater stabilization may be realized when the switch 3
  • the self-quench period thereof may vary dynamically in accordance with the amplitude modulation of the received amplitude-modulated wave signal due to the low impedance of the condenser 38, at frequencies corresponding to those of themodulation components, with respect to the value of the resistor 32, and the value of the'control electrode to cathode impedance of the tube II.
  • the dynamic quench rate variesin accordance with the amplitude modulation of the received wave signal and the modulation components are derived'inthe anode circuit of the'regenerator' tube II as dynamic variations of
  • the superregenerative receiver is realized when the selfquench network therefor is positioned in the anode circuit of the regenerator tube I l instead of in" the" cathode circuit thereof.
  • This type of s'elf' -quench operation may be realized by adjusting condenser 25-so that its capacitance is quite small, by moving theswitch 20 to close its contact a,-and by leaving-the remaining switches in the positions which were previously mentioned.
  • the periodic charging and discharging of the condenser 25 determines the quench-voltage wave shape.
  • the condenser 25 and the resistor 22 in the anode 'circuit'of'thg tube H comprise the quench determining elements for the superregenerative circuit.
  • a' large output signal with respect to "the modulation-signal components of the applied wave signal may be realized. This results because there is no degeneration with respect to the modulation-signal components in the anode circuit of the tube II and because of the large impedance and the large current flow in the anode circuit. No degeneration takes place with this type of quench circuit because the stabilizing network may be chosen to present an impedance to audio-frequency components so low that it does not tend to stabilize with respect to audio-frequency variations in the quench rate.
  • the condenser 25 is adjusted to provide a relatively large capacitance as mentioned hereinbefore, the switch 20 is operated to close its contact a, the switch 41 may be set to close either of its contacts a or 1) depending on whether the modulation components of the applied signal are to be derived from the anode circuit or the control-electrode circuit of the regenerator tube, and the switch 51 is adjusted to close its contact a or its contact as required.
  • may be operated to close its contact 0 for providing a maximum stabilizing action with respect to the operating character- -istics of the receiver.
  • the network 31 effectively comprises the stabilizing network while the network 21 comprises a network for developing from the control-electrode current pulses the self-quench voltage for the receiver.
  • the operation of the receiver when connected in this manner is much the same as that which was previously described in detail, and hence will not be repeated.
  • the condenser 38 may have a relatively small value of capacitance and yet provide with the resistor 32 the necessary stabilizing action.
  • the condenser 38 has a relatively large value. of capacitance so that an electrolytic type condenser is ordinarily employed.
  • an: economy may be effected because of the relatively smaller capacitance value of the condenser 38.
  • the greater stability thereof may afford more flexibility in the choice of the wave shape of the quench voltage when particular operating characteristics of the receiver are desired to be obtained therefrom.
  • a saving in, the cost of the components for use in the stabilization network ofthe superregenerative receiver may. also be effected, since condensers of relatively smaller capacitance may be employed in lieu of the somewhat more expensive electrolytic condensers employed in prior stabilized selfquench superregenerative receivers.
  • a self-quench superregenerative receiver embodying the instant invention is suited for use at higher quench rates since the regenerator tube is operating in such a manner that the transconductance thereof is not undesirably reduced by a low anode-cathode voltage on the regenerator tube.
  • micromicrofarads Condenser 25 Cathode quench 0.01 microfarad Anode quench 300 micromicrofarads Control-electrode V quench 0.01 microfarad Condenser 28 500 .micromicrofarads Condenser 38 lo microfarads Resistor I3 l5 kilohms Resistor 22:
  • a self-quench superreg'enerative receiver comprising: a regenerative circuit adapted to have a modulated wave signal applied thereto and including a regenerator tube having anode, cathode, and control electrodes; self-quench means coupled to said cathode electrode and having a periodic potential developed thereacross in response to an electrode-current flow of said regenerator tube for effecting periodic seliquenching of said regenerative circuit to provide superregenerative amplification of said applied wave signal; the parameters of said circuit and said self-quench means being so proportioned that the oscillatory amplitude of said circuit extends to a saturation-level mode of operation thereof during an interval of each quench cycle; an electrical time-constant network, having a time constant longer than that oi V s aid selfquench means and the periodicity of the lowest frequency modulation components of said applied wave signal, coupled in circuit with said regenerative circuit between said control electrode and cathode and responsive to control electrode current of said regenerator tube flowing only during said saturation-level intervals to develop
  • a self-quench superregenerative receiver comprising: a regenerative circuit adapted to have a modulated wave signal applied thereto and including a regenerator tube having an anode, a cathode and a control electrode; selfquench means coupled between said cathode and a fixed potential point and having a periodic potential developed thereacross in response to the anode-cathode current flow of said regenerator tube for effecting periodic self-quenching of said regenerative circuit to provide superregenerative amplification of said applied wave signal; the parameters of said circuit and said self-quench means being so proportioned that the oscillatory amplitude of said circuit extends to a saturationlevel mode of operation thereof during an interval of each quench cycle; an electrical time-constant network, having a time constant longer than that of said self-quench means and the periodicity of the lowest frequency modulation components of said applied wave signal, coupled in circuit with said regenerative circuit between said control electrode and cathode and responsive to control-electrode current of said regenerator tube flowing only
  • a self-quench su'perregenerative receiver comprising: a regenerative circuit adapted to have a modulated wave signal applied thereto and including a regenerator tube having an anode, a cathode, and a control electrode; a re- 'sistor and a condenser connected in parallel therewith coupled'to said cathode and having a periodic potential developed thereacross in response to cathode-current flow of said regenerator tube for effecting periodic self-quenching of said regenerative circuit to provide superregenerative amplification of said applied wave signal; the parameters of said circuit and said resistor and condenser being so proportioned that the oscillatory amplitude of said circuit extends to a saturation-level mode of operation thereof during an interval of each quench cycle; an electrical time-constant network having a time constant longer than that of said resistor and said condenser coupled in circuit with said regenerative circuit between said control electrod and cathode and responsive to control-electrode current of said regenerator
  • a self-quench superregenerative receiver comprising: a regenerative circuit adapted to have a modulated wave signal applied thereto and including an oscillatory circuit and a regenerator tube having an anode, a control electrode and a cathode coupled to said oscillatory circuit;
  • a parallel-connected resistor-condenser network having a time constant greater than the time constant of damping of said oscillatory circuit and coupled to said cathode and. having a periodic potential developed thereacross in response to an electrode-current flow of said regenerator tube for efiecting periodic self-quenching of said regenerative circuit to provide superregenerative amplification of said applied wave signal; the parameters of said regenerative circuit and said network being so proportioned that the oscillatory amplitude of said circuit extends to a saturation-level mode of operation thereof during an interval of each quench cycle; an electrical time-constant network having a time constant longer than that of said first-mentioned network coupled in circuit with said regenerative circuit between said control electrode and cathode and responsive to control-electrode current of said regenerator tube flowing only during said saturation-level intervals to develop across said network for application to said control electrode a gain-control potential efiective to stabilize the operating characteristics of said receiver against operating conditions which tend to modify the average self-quench periodic
  • a self-quench superregenerative receiver comprising: a regenerative circuit adapted to have a modulated wave signal applied thereto and including an oscillatory circuit and a regenerator tube having an anode, a control electrode and a cathode coupled to said oscillatory circuit; an electrical time-constant network, having a time constant greater than the time constant of damping of said oscillatory circuit and including a resistor having a value of resistance much greater than the conductive control electrode-cathode resistance of said tube, coupled between said cathode and a fixed potential .point andhaving a periodic potential devel oped 'thereacross in response to an electrodecurrent flow of said regenerator tube for efiecting periodic self-quenching of said regenerative circuit to provide superregenerative amplification of said applied wave signal; the parameters of said regenerative circuit and said network being so proportioned that the oscillatory amplitude of said circuit extends to a saturation-level mode of operation thereof during an interval of each quench cycle; a source of

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US788765A 1947-11-28 1947-11-28 Self-quench superregenerative receiver Expired - Lifetime US2616039A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE486059D BE486059A (pt) 1947-11-28
US788765A US2616039A (en) 1947-11-28 1947-11-28 Self-quench superregenerative receiver
GB27537/48A GB646331A (en) 1947-11-28 1948-10-20 Self-quench superregenerative receiver
CH270714D CH270714A (de) 1947-11-28 1948-11-15 Selbstpendelnder Pendelrückkopplungsempfänger.
FR975353D FR975353A (fr) 1947-11-28 1948-11-22 Récepteurs à super-réaction et à auto-amortissement
DEP22739D DE807631C (de) 1947-11-28 1948-11-25 Selbstpendelnder Pendelrueckkopplungsempfaenger mit logarithmischer Arbeitsweise
ES0186086A ES186086A1 (es) 1947-11-28 1948-11-26 UN RECEPTOR SUPERREGENERATIVO DE AUTOEXTINCIoN

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US (1) US2616039A (pt)
BE (1) BE486059A (pt)
CH (1) CH270714A (pt)
DE (1) DE807631C (pt)
ES (1) ES186086A1 (pt)
FR (1) FR975353A (pt)
GB (1) GB646331A (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL203732A (pt) * 1955-01-18
JPS5696507A (en) * 1979-12-15 1981-08-04 Matsushita Electric Works Ltd Superregenerative receiver
DE10143921C2 (de) * 2001-09-07 2003-11-20 Koeppern & Co Kg Maschf Verfahren und Vorrichtung zum Herstellen von Heißpreßkörpern und Heißpreßkörper

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071950A (en) * 1933-09-28 1937-02-23 Rca Corp Super-regenerative receiver
US2147595A (en) * 1937-12-09 1939-02-14 Rca Corp Ultra high frequency transceiver
US2226657A (en) * 1938-06-06 1940-12-31 Bly Merwyn Ultra short wave radio receiver
US2407394A (en) * 1944-06-29 1946-09-10 Colonial Radio Corp Self-quenched superregenerative receiver
US2410768A (en) * 1943-02-03 1946-11-05 Gen Electric Superregenerative receiver circuit
US2410981A (en) * 1942-06-25 1946-11-12 Rca Corp Superregenerative receiver circuits
US2412710A (en) * 1944-07-15 1946-12-17 Philco Corp Superregenerative receiver quenching circuit
US2504636A (en) * 1944-07-15 1950-04-18 Philco Corp Superregenerative receiver circuit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071950A (en) * 1933-09-28 1937-02-23 Rca Corp Super-regenerative receiver
US2147595A (en) * 1937-12-09 1939-02-14 Rca Corp Ultra high frequency transceiver
US2226657A (en) * 1938-06-06 1940-12-31 Bly Merwyn Ultra short wave radio receiver
US2410981A (en) * 1942-06-25 1946-11-12 Rca Corp Superregenerative receiver circuits
US2410768A (en) * 1943-02-03 1946-11-05 Gen Electric Superregenerative receiver circuit
US2407394A (en) * 1944-06-29 1946-09-10 Colonial Radio Corp Self-quenched superregenerative receiver
US2412710A (en) * 1944-07-15 1946-12-17 Philco Corp Superregenerative receiver quenching circuit
US2504636A (en) * 1944-07-15 1950-04-18 Philco Corp Superregenerative receiver circuit

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BE486059A (pt)
FR975353A (fr) 1951-03-05
ES186086A1 (es) 1949-02-16
GB646331A (en) 1950-11-22
CH270714A (de) 1950-09-15
DE807631C (de) 1951-07-02

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