US1771021A - Electron-tube relay - Google Patents

Electron-tube relay Download PDF

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Publication number
US1771021A
US1771021A US384165A US38416529A US1771021A US 1771021 A US1771021 A US 1771021A US 384165 A US384165 A US 384165A US 38416529 A US38416529 A US 38416529A US 1771021 A US1771021 A US 1771021A
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US
United States
Prior art keywords
anode
circuit
electron
relay
voltage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US384165A
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English (en)
Inventor
Vos Mauritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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Filing date
Publication date
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/02—Details
    • H03D1/06—Modifications of demodulators to reduce distortion, e.g. by negative feedback

Definitions

  • the present invention relates to Velectron tube relays in which-the grids belonging to two mutually parallel-connected anodes are i subjected vto alternating potentials having y equal amplitudesfbut opposite phases.
  • the static characteristic of the combined relay may be repre sented by a diagram which is nearly parabolic and symmetrical in relationito oneof the coordinate axes; VOn the Vother hand, the dynamic characteristic indicating the opera- ⁇ tionot the relays will in the known arrangement deviate ⁇ from the static one, ⁇ on account of the reaction'exerted upon the resulting control voltage in thetubes andVV Acaused by the drop of voltage inthe outer' impedance 1 of the anode circuit.
  • the invention haspfor its object to establish a relation between the anode current and thegrid voltagefwhich relation is as simple as possiblek and is furthering the modulation or the demodulation respectively.
  • a compensating voltage' is back-coupled from the anodecircuit common to the anode's, to the two grids with the same phase and amplitude and in such amanner that the reaction of the anodeload lupon the control voltages Vis substantially compensated.r
  • n for thedynamic characteristic one ⁇ may then ⁇ obtain a parabolapractically completely ⁇ conforming with the static characteristic whichv curve represents the ideal shape; of achaiacteristicV in amodulatorf orv demodulator.
  • the grids 6, 6 of the two tubes are connected each to one end of the secondary coil 7 of a transformer the ⁇ primary terminals 8 of which constitute the inputv terminals of the relay.
  • the secondary winding? is- 10 provided V'with an intermediate tapping, 9 to which a grid biasing battery 10 may be connected.
  • ⁇ Hf 'e 4 The circuit arrangement l according toV therein that the grids 6, 6 are directly connected each to one oflthveinput terminals 8 Vbetween which an impedance 11 provided Vwith ajmiddle pointtapping 12 is interconnected. may be connected.
  • the diagram Vr represents the amplitude of the Lcontrol .1 alternating voltages according l. to the formula i 9 relating to the twotubes, 1, 1.
  • the biasingbattery10S ⁇ in the diagram in Figure 4 be represented 85 vby two curves-extending symmetrically in really expressed thrcugh thefcr- If the tubes are exactly equal the corresponding constants are alike.
  • the last terms correspond to the compensating voltage transferred back to the grid circuit from .the anode circuit.
  • said voltage is so adjusted that
  • the resulting anode current Ia in the coil 3 is then obtained by insertion into the Equation 2, thus Said resulting anode current is in the diagram in Fig. 4 represented by the parabolic curve drawn in full lines. In most cases it is possible in the last equation to neglect terms of higher powers than the second for which reason the curve Ia may be considered as practically an exact parabola.
  • the term essential to the modulation in the expression for Ia is then according to Formula 4 'be fulfilled by a suitable selection of the grid direct current'biasing voltage according to Figure 4 so as to obtain said point at the verteX of the parabola, (A in Figure 4), or in other words in such a way that the resulting control direct current voltage
  • the suppression of the carrier wave brings certain advantages in case the modulating oscillations, according to the invention, are transferred from a modulator to a power amplifier before they are supplied to an antenna or the like. By the suppression of the carrier wave the power amplifier is, namely, unloaded therefrom and operates thus more economically.
  • FIG. 3 To bring about said compensation one may according to the invention as shown in Figure 3 include a. retransfer coil 13 in series with the grid biasing battery 10 which coil is inductively coupled to the primary coil 3.
  • the degree of coupling between the coils 3 and 13 is so adjusted that the reaction of the anode load is substantially compensated which occurs if the retransferred voltage V., is made equal In this case the control voltage wise would occur on account of the reaction of the anode circuit.
  • the arrangement may also be subjected to a completely exact precalculation.
  • A11 electron tube relay comprising two .Y

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Tubes (AREA)
  • Secondary Cells (AREA)
  • Details Of Television Scanning (AREA)
US384165A 1928-10-01 1929-08-07 Electron-tube relay Expired - Lifetime US1771021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE335009T 1928-10-01

Publications (1)

Publication Number Publication Date
US1771021A true US1771021A (en) 1930-07-22

Family

ID=31944982

Family Applications (1)

Application Number Title Priority Date Filing Date
US384165A Expired - Lifetime US1771021A (en) 1928-10-01 1929-08-07 Electron-tube relay

Country Status (5)

Country Link
US (1) US1771021A (de)
DE (1) DE585809C (de)
FR (1) FR679886A (de)
GB (1) GB335009A (de)
NL (1) NL29929C (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470085A (en) * 1936-02-08 1937-08-09 Marconi Wireless Telegraph Co Improvements in or relating to electron discharge device circuit arrangements
US3136866A (en) * 1952-05-27 1964-06-09 Ampex Tape recorder circuit

Also Published As

Publication number Publication date
DE585809C (de) 1933-10-13
NL29929C (de)
FR679886A (fr) 1930-04-18
GB335009A (de) 1930-09-18

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