US2163670A - Carrier wave transmitter - Google Patents

Carrier wave transmitter Download PDF

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Publication number
US2163670A
US2163670A US62020A US6202036A US2163670A US 2163670 A US2163670 A US 2163670A US 62020 A US62020 A US 62020A US 6202036 A US6202036 A US 6202036A US 2163670 A US2163670 A US 2163670A
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Prior art keywords
cathode
anode
modulating
tube
devices
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Expired - Lifetime
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US62020A
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English (en)
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Ditcham William Theodore
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RCA Corp
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RCA Corp
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator

Definitions

  • the principal object of the present invention is to avoid this difficulty and to provide an improved transmitter of the kind wherein amplification of the modulated carrier wave energy is effected.
  • a transmitter of the kind wherein the carrier wave oscillations are modulated so that substantially distortionless modulated carrier wave energy appears in a circuit which is followed by an amplifier 4for amplifying said modulated carrier wave energy means are provided for differentially combining energy derived from said circuit and from a circuit of the amplifier which follows it and utilizing the differentially combined energy to apply compensation at a point in the transmitter preceding said amplifier in such manner that so long as a predetermined relationship exists between the two differentially combined energies, no compensation is applied, but if said predetermined relationship isv departed from, compensation is applied in such direction as substantially to compensate for that departure.
  • high frequency carrier wave oscillations from a source are applied via a coupling at O between the control grid and 10 the cathode of a high frequency amplifier tube VI, whose anode-to-cathode space is in series with the anode-to-cathode space of a modulating tube V2, the arrangement preferably being the usual series modulation arrangement sho-wn 15 and wherein a series circuit extends from the positive terminal of a source of anode potential I0 from the anode to the cathode of the high frequency amplifier tube VI, then through a choke CH to the anode of the modulating tube 20 V2, from the anode to the cathode of the said modulating tube, and then to earth and the negative terminal of the source of anode potentialy l0.
  • Modulating potentials are applied from 'a source I2 via transformer lVf through a suit- 25 able coupling condenser CC between the control grid and the cathode of the modulating tube V2.
  • the grid-to-cathode circuit of this modulating tube includes in series the usual grid resistance, a source B of suitable negative bias pc- 30 tential, and two bias resistances RI, R2.
  • Connected to the anode of the high frequency tube VI is the usual tuned output circuit LCI which in turn is coupledby a condenser IlIto the grid of a power tube V3 which serves to amplify the 35 tuned output circuit LCI of thehigh frequency 4,0A
  • tube'VI at which modulation is effected is a coil MA which is in series in a loop circuit with a suitable rectifier DI, e. g., a diode, and a smoothing inductance SL and condenser SC and the terminals of this condenser are connected across 45 the resistance RI.
  • a suitable rectifier DI e. g., a diode
  • a smoothing inductance SL and condenser SC and the terminals of this condenser are connected across 45 the resistance RI.
  • Coupled to the inductance in the tuned output circuit LCZ of the power tube V3 is an inductance PA which is similarly in series with a loop circuit with a rectifier D2, smoothing inductance SLI, and condenser SCI 50 and the said condenser SCI is connected across the other bias resistance R2 in the grid-cathode circuit of the modulating tube V2.
  • the sense of connection of the rectiflers is such that rectified potentials set up across the bias resistance RI 55 oppose those across the bias resistance R2 and the adjustments of the circuits are such that as long as the modulated carrier wave energy in the output circuit LC2 of the power tube V3 is an accurate repetition of that in the output circuit LCI of the high frequency tube Vl, the algebraic sum of the potentials set up across the two bias resistances Rl R2 is zero.
  • the modulated carrier wave energy in the output circuit LC2 ceases to be an accurate repetition of that across one of the two series-connected bias resistances RI, R2 will becomegreater than that set up across the other with the result that the total grid bias upon the modulating tube V2 will vary in a direction and to an extent suflicient to cause compensation for the distortion in question.
  • a direct current amplifier maybe interposed; in other words, the two bias resistances Rl, R2 which in Fig. 1 are in the grid-cathode circuit of the vmodulating tube V2, may be as shown in Fig. 2 included instead in the grid circuit of aV direct current amplifier tube V0, and the anode ofthistube may be connected through a suitable source of fixed bias Bl in series with a grid resistance to the grid of the modulating tube ⁇ V2,'the anode of the said direct current amplifier tube Vl!
  • Figs. 1 and 2 can be arranged to provide automatic compensation for distortion arising by reason of departure from rectilin-earity both at the upper and lower bends of the characteristic curveY of the power amplifier tube.
  • a somewhat simpler arrangement can be used, this simpler arrangement employing only a single rectifier.
  • a plurality of electron discharge tubes each of which has input and output electrodes, alternating current circuits for impressing wave energy of carrier wave frequency on the input electrodes of one of said tubes and from the output lelectrodes of said one of said tubes to the input electrodes of another of said tubes, a modulating impedance variable at, signal frequency connected with an electrode in the output circuit LCI, the potential set up'Y in said one of said tubes to modulate said wave Venergyyand supplemental means for additionally modulating said wave energy when the modulated wave energy in the output of said other of said tubes is not a substantial repetition in wave form of the modulated wave energy in the output of saidone of said tubes, including rectifying means differentially coupling an electrode of each of said tubes to said modulating impedance to additionally control the impedance thereof.
  • a pluralityof electron discharge tubes each of which has input and output electrodes, alternating current circuits for impressing wave energy of carrier Wave frequency on the input electrodes of one of said tubes and from the output electrodes of Asaid'one of said tubes to theV input electrodes of another of said tubes, a modulating impedance controllable at signal frequency connected with an electrode in said one cfsaid tubes to modulate therein said wave energy, a supplemental impedance connected with said modulating impedance for regulating the value of said controllable modulating impedance,l and differential circuitsl including ⁇ rectifying means coupling the output electrodes of each of said-tubes to said supplemental impedance to impress additional controlling potentials thereon when the modulated wave energy in said other of said tubes is not substantially a repetition in wave form of the modulated wave energy in said one of said tubes.
  • a plurality of electron discharge tubes each of which has input and output electrodes, high frequency alternating current circuits for impressing wave energy on the-input electrodes of .one of said tubes and from the output lelectrodes of saidone of said tubes to ther input electrodes of another of said tubes, a modulating impedance variable at signal frequency connected with an electrode in said one of said tubes to-modulate said Wave energy, a pair of supplemental impedances connected with said modulating impedance for regulating the value of said modulating impedance, and rectifiers differentially'coupling the output electrodes of each of said tubes to said supplemental impedances.
  • a plurality of discharge devices each having a control electrode, an anode and a cathode, alternating current circuits for impressing wave energy on the control electrode and cathode of one of said devices and from the anode and cathode of said one of said devices on the control electrode and cathode of another of said devices, a modulating tubehaving electrodes, the impedance between a'pair of which is connected in series with the impedance between the anode and cathode of said one of said electron discharge devices, means for impressing modulating potentials on an' electrode of said modulating tube, supplemental means for impressing' other potentials on an electrode of said modulating tube when the energy Yin said other of said devices is not a substantial repetition oftheV energy in saidlonedevice, andcircuits each including a rectifier coupling said supplemental means differentially to the output electrodes of said one of said devices and to the output electrodes of said other of said devices.
  • a plurality of electron discharge devices each having a control electrode, an anode and a cathode, alternating current circuits for impressing wave energy on the control electrode and cathode of one of said devices and from the anode and cathode of said one of said devices on the control electrode and cathode of another of said devices
  • a modulating tube having a control grid, an anode and a cathode, means connecting the impedance between the anode and cathode of said tube in series with the impedance between the anode and cathode of said one of said discharge devices, means for impressing modulating potentials on an electrode of said modulating tube, supplemental means for impressing correcting potentials on an electrode of said modulating tube when the energy in the output of said other of said devices is not a substantial repetition of the energy in the output of said one of said devices, and circuits including rectii'lers coupling said supplemental means differentially to the output electrodes of said one of said devices and
  • a plurality of electron discharge devices each having a control electrode, an anode and a cathode, alternating current circuits for impressing wave energy on the control electrode and cathode of one of said devices and from the anode and cathode of said one of said devices on the control electrode and cathode of another of said devices
  • a modulating tube having electrodes including a control grid and a cathode, a circuit connecting the impedance between a pair of the electrodes in said tube in series with the impedance between the anode and cathode of said one of said discharge devices, means for impressing modulating potentials on the control grid of said modulating tube, supplemental means for impressing other potentials on the control grid of said modulating tube when wave distortion occurs in said devices or circuits, and circuits including rectiers coupling said supplemental means diierentially to the output electrodes of said one of said devices and to the output electrodes of said other of said devices.
  • a plurality of electron discharge devices each having a control grid, a cathode and an anode, alternating current circuits for impressing wave energy on the control grid and cathode of one of said devices and from the anode and cathode of said one device to the control grid and cathode of another of said devices, a modulating tube having an anode, a cathode and a control grid, circuits connecting the anode and cathode of said modulating tube in series with the anode and cathode of said one of said electron discharge devices and with a source of direct current potentials, means for impressing modulating potentials on the control grid and cathode of said modulating tube, a circuit for impressing a biasing potential between the control grid and cathode of said modulating tube, a pair of impedances in said circuit, a pair of rectifiers having input electrodes and having output electrodes differentially connected with said pair of impedances and a coupling
  • a plurality of electron discharge devices each having a control grid, a cathode and an anode, alternating current circuits for impressing wave energy on the control grid and cathode of one of said devices and from the anode and cathode of said one device .to the control grid and cathode of another of said devices, a modulating tube having an anode, a cathode and a control grid, circuits connecting the anode and cathode of said modulating tube in series with the anode and cathode oi said one of said electron discharge devices and with a source of direct current potentials, means for impressing modulating potentials on the control grid and cathode of said modulating tube, a circuit for impressing a biasing potential between the control grid and cathode of said modulating tube, an impedance in said circuit, an amplifier tube having input electrodes and having output electrodes connected to said impedance, a pair of rectiers having input electrodes and having output electrode
  • a plurality of electron discharge devices each having a control grid, a cathode and an anode, alternating current circuits for impressing wave energy on the control grid and cathode of one of said devices and from the anode and cathode of said one device to the control grid and cathode of another of said devices, a modulating tube having an anode, a cathode and a control grid, circuits connecting the anode and cathode of said modulating tube in series with the anode and cathode of said one of said electron discharge devices and with a source of direct current potentials, means for impressing modulating potentials on the control grid and cathode of said modulating tube, a circuit for impressing a biasing potential between the control grid and cathode of said modulating tube, a rectier having input electrodes and having output electrodes connected with said last named circuit, a coupling between the input electrodes of said rectifier and the anode Vand cathode of said one
  • a plurality of electron discharge amplifying devices each having a control electrode, an anode, and a cathode, a source of oscillations of carrier wave frequency, an alternating current input circuit coupling the control electrode and cathode of one of said devices to said source of oscillations, an alternating current output circuit coupling the anode and cathode of said one of said devices to the control electrode and cathode of another of said devices, an alternating current output circuit connected with the anode and cathode of said other of said devices, a source of modulating potentials, an additional electron discharge device having an anode, a cathode, and a control grid, a circuit coupling the control grid and cathode of said additional device to said source of modulating potentials, a circuit including a ferentially to said impedanca'a 'circuit Ycoupling the Vinput electrodes of one of said rectiers to the output circuit connected with the output elec trodes of said one

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US62020A 1935-02-25 1936-02-03 Carrier wave transmitter Expired - Lifetime US2163670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5993/35A GB452582A (en) 1935-02-25 1935-02-25 Improvements in or relating to carrier wave transmitters

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US2163670A true US2163670A (en) 1939-06-27

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US452582D Pending USB452582I5 (enrdf_load_stackoverflow) 1935-02-25
US62020A Expired - Lifetime US2163670A (en) 1935-02-25 1936-02-03 Carrier wave transmitter

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GB (1) GB452582A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419615A (en) * 1942-11-25 1947-04-29 Fed Telephone & Radio Corp Hum reducing modulator
US2572832A (en) * 1948-05-24 1951-10-30 William B Bernard Tube protection circuit
US2835869A (en) * 1955-06-21 1958-05-20 Rca Corp Television transmitter with improved amplitude linearity
US2944227A (en) * 1956-01-19 1960-07-05 Marconi Wireless Telegraph Co Modulating circuit arrangements
US2956243A (en) * 1958-05-28 1960-10-11 Bruno O Weinschel Regulated source of high-frequency energy
US3176213A (en) * 1960-12-29 1965-03-30 North American Aviation Inc Static inverter
US3643161A (en) * 1967-12-13 1972-02-15 Gates Radio Co Pulse duration modulation transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135556A (en) * 1983-02-23 1984-08-30 Mcmichael Ltd Radio transmitter arrangements

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419615A (en) * 1942-11-25 1947-04-29 Fed Telephone & Radio Corp Hum reducing modulator
US2572832A (en) * 1948-05-24 1951-10-30 William B Bernard Tube protection circuit
US2835869A (en) * 1955-06-21 1958-05-20 Rca Corp Television transmitter with improved amplitude linearity
US2944227A (en) * 1956-01-19 1960-07-05 Marconi Wireless Telegraph Co Modulating circuit arrangements
US2956243A (en) * 1958-05-28 1960-10-11 Bruno O Weinschel Regulated source of high-frequency energy
US3176213A (en) * 1960-12-29 1965-03-30 North American Aviation Inc Static inverter
US3643161A (en) * 1967-12-13 1972-02-15 Gates Radio Co Pulse duration modulation transmitter

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Publication number Publication date
GB452582A (en) 1936-08-25
USB452582I5 (enrdf_load_stackoverflow)

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