US2662127A - Tunable high-frequency push-pull power amplifier - Google Patents

Tunable high-frequency push-pull power amplifier Download PDF

Info

Publication number
US2662127A
US2662127A US222778A US22277851A US2662127A US 2662127 A US2662127 A US 2662127A US 222778 A US222778 A US 222778A US 22277851 A US22277851 A US 22277851A US 2662127 A US2662127 A US 2662127A
Authority
US
United States
Prior art keywords
conductor
anode
lecher
conductors
flattened
Prior art date
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
Application number
US222778A
Other languages
English (en)
Inventor
Boterweg Dirk
Robeer Andries Gerrit
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2662127A publication Critical patent/US2662127A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/02—Lecher resonators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/03—Constructional details, e.g. casings, housings

Definitions

  • This invention relates to high-frequency pushpull power amplifiers comprising airor watercooled amplifying tubes with anode cylinders which are open at one end and comprising a lecher conductor as anode circuit.
  • Power ainpliiying tubes for example for powers of 10 kw. and higher are nearly always equipped with such anodes.
  • the present invention has for its object to provide a suitable construction for such an amplifier, which permits a wide wave length range to be covered with a high power (for example 100 kw.) at short wave lengths, down to approximately 10 meters, the losses being small.
  • a high power for example 100 kw.
  • the lecher conductor consists of two hollow conductors of fiattened cross-section at the sides facing each other and a short-circuit bridge arranged to be continuously displaceable between the flattened flanks and covering the whole width of the fiat sides, the open end of each anode cylinder being connected to the associated lecher conductor near one of the two long edges of the flattened flanks of the conductor, which flattened flanks extend substantially parallel to the axis of the amplifying tube.
  • the short circuit bridge should occupy an oblique position relatively to the longitudinal direction of the lecher conductor such that the distance from the bridge to the anode cylinder along the said edge of the flattened .fiank of the lecher wire, which edge is connected to the open end of the anode cylinder is larger, and along the other edge is smaller in the case of a short-circuit bridge extending at right angles to the lon- 2 gitudinal direction of the lecher conductor.
  • the lecher conductor consists of two equal circular conductors and the short-circuit bridge is secured to an arm rotatable about a shaft extending through the centres of curvature of the two conductors.
  • the innermost edges of the flattened lecher conductors are connected to the open ends of the associated anode cylinders, the short-circuit bridge being at an angle of less than 180 with the straight junction line to the axis of rotation.
  • a cou pling loop for coupling the amplifier with a load, for example an aerial, use may be made of a cou pling loop in the form of. a second lecher wire. As will appear from the following, this loop is provided at that side of the anode lecher conductor, which is connected to the open ends of the anode cylinders.
  • the lecher conductor constituting the anode circuit consists of two similar cylinder conductors I and '3 having flattened cross-sections at the adjacent sides. Owing to this form of its section, the 'lecher conductor has a high capacity and a low inductance per unit length and consequently a low surge resistance (for example 15052). This is desirable in order to prevent the electrode capacities of the amplifying tubes and other capacitors bridging the open end of the lecher conductor, from causing .an excessive reduction of the resonance frequency.
  • a short-circuit bridge 5 is displaceable, since it is secured to an insulating arm I which is rotatable about a shaft 9 extending through the centres or curvature of the curved conductors .l and 3.
  • the short-circuit bridge 5 is provided at both sides with resilient contacts Hand l3 respectively jointly occupying the whole width of the facing flattened flanks of the conductors and 3, so that the considerable high-frequency circulating current, which in the case of a transmitter of 100 kw. may be of the order of 300 A, is distributed over a comparatively large number of contacts ll and 13 respectively, each of the contacts I I being connected to the opposite contact 5-3 through ashort metal strip 15.
  • the lecher conductor 13 is permanently short-circuited by a plate or flange 111.
  • the free ends of the conductors I and 3 are connected respectively to the anodes of two water-cooled power amplifying tubes 21 and 23; each of kw. in this example.
  • These tubes are of conventional con struction and comprise an anode cylinder 25 which is open at the top 25 and surrounded for the greater part by a cooling water jacket 2? and a glass bulb 2 9 which is hermetically sealed to the anode cylinder 225 just below the open edge .25.
  • the grid of the tube is secured to a chrome iron ring ti which is also sealed hermetically to the bulb and serves at the same time as a terminal for the grid.
  • the end of a circular conductor 35 is electrically connected, through a broad metal strip 33, to the ring
  • the conductor 35, 3? acts as a grid oscillatory circuit and is tunable by means of a short-circuit bridge 4
  • the anode and the jacket 21 are coaxially surrounded by a copper cylinder 43 which is open at both ends and furnished in the usual manner with inwardly bent anti-corona edges.
  • a copper cylinder 43 which is open at both ends and furnished in the usual manner with inwardly bent anti-corona edges.
  • the cylinder 53 has for its purpose to enclose the anode cylinder and accessories in a fieldless space to prevent corona phenomena along any comparatively sharp edges.
  • the cylinder 53 and a cylindrical plate ll partly surrounding the cylinder 45 coaxially, constitute one of two neutrodyne condensers of the amplifier.
  • a metal cone i9 widening upwardly is provided just below the sealing edge at the outer side, which cone is also provided with an anticorona edge and has an open-worked shell.
  • the sealing edge is provided in the fieldless space between the upper end 25 of the anode cylinder and the cone 55.
  • may be provided with a similar cone.
  • the end of the lecher conductor I adjoins the cylinder 53 such that one of the two long edges of the flattened inner flank of the conductor, the innermost edge of the circular flattened strip, which flattened flank extends at least substantially parallel to the axis of the tube 2!, is connected to the open end of the anode cylinder 25.
  • the inductance of the connection of the anode to the lecher conductor proves to be minimised which is of much importance for obtaining a wave range with a minimal wave length.
  • the positioning of the tubes parallel to the flattened flanks is essential for constructional reasons, namely the saving in space, easy shielding of anode and grid space, and in View of the fact that in this manner the cylinder 43 and the corresponding cylinder associated with tube 23 electrically constitute an extension of the lecher conductor I, 3.
  • connection between the lecher conductor I and the anode 25 passes over the annular plate 45 constituting a through-connection of low inductance.
  • the lecher wire may be connected to the cooling water jacket 21.
  • the high-frequency anode current passes exclusively along the surface 1. e. from the inner side of the anode over the open edge 25, through the apertured cone Q9, over the plate 45 and the anti-corona edge of the cylinder 43 to the upper edge of the conductor I and is then distributed over the flattened inner flank.
  • the distance which the current has to travel to these contacts II of the short-circuit bridge 5, which are located nearest to the shaft 9, in the drawing the upper contacts II, is in general shorter than the distance from the other contacts II.
  • the short-circuit bridge 5 a slightly inclined position in the aforesaid manner.
  • the distance from the bridge 5 to the anode 25 along the upper edge of the flattened inner flank of the circular conductor.I is greater, and along the other edge is smaller than in the case of a not inclined position of the bridge 5 or, in general, such that the distance from the bridge 5 to the anode 25 along that edge of the flattened inner flank, in the present case the innermost edge of the curved conductor I, which is connected to the open end 25 of the anode cylinder 25, is greater and along the other edge is smaller than in the case of a not inclined or radial-position of the bridge.
  • an inclined position of the bridge 5 is obtainable such that all contacts II and I3 are loaded substantially to the same degree. This is of great importance to avoid trouble due to burning out of the contacts at very high current intensities.
  • the conductor I may consist of three copper tubes 5i, 52, 53 interconnected by soldering flat flank strips to them.
  • the lecher conductor I, 3 may alternatively be differently shaped or straight, but in regard to cost and volume the first-mentioned construction is particularly advantageous and most suitable for applying the aforesaid constructional principles.
  • the open end 25' of the anode cylinder in this construction is preferably connected to or near the innermost edges of the flattened flanks of the lecher conductors (I and 3). Structurally, this is the best solution, since the amplifying tubes 2
  • a coupling loop in the form of a separate, substantially semi-circular lecher wire 51, 59 is arranged substantially concentrically with the conductor I, 3.
  • the wire 51, 59 extends along part of the conductor I, 5 and is terminated at one end by a fixed short-circuit bridge 6! located in the proximity of the amplifying tubes 2! and 23.
  • the length of that part of the coupling loop 51, 59, SI which is coupled to the conductor I, 2 depends upon the momentary position of the short-circuit bridge 5 and, as appears from the drawing, is greater as the wave length adjusted is greater, which permits approximately the correct degree of coupling to be obtained.
  • the coupling loop is provided opposite that side of the conductor I, 3 which is connected to the open ends of the anode cylinders, in the present case at the inner side of the circular conductor 3.
  • the current flowing in this conductor is, at least near the tubes 2! and 23, a maximum at this side of the conductor I, 3 so that at this point the closest coupling is obtainable, which is of particular importance with the shorter waves of the wave range.
  • the construction described may be used advantageously for air-cooled power amplifying tubes.
  • the construction problems arising therein are, similarly to watercooling, for the greater part due to the large size of the component parts and can be solved satisfactorily in the aforesaid practical manner.
  • a tunable high-frequency push-pull power amplifier comprising a pair of water-cooled anode tubes each having a cylindrical anode open at one end, and an anode circuit for said tubes including a lecher line having a pair of parallel hollow conductors extending longitudinally along a curved path, said conductors being of flattened cross section at the sides thereof facing each other, means connecting the ends of said conductors to the respective anodes, the flattened sides of said conductors being disposed in parallel relation to the axes of said cylindrical anodes, a short circuiting movable bridge occupying an oblique position relative to the longitudinal direction of said line interconnecting the flattened sides of said conductors over substantially the full width of said flattened sides and cooling channels extending through said hollow conductors to said tubes.
  • a tunable high-frequency push-pull poweramplifler comprising a pair of water-cooled anode tubes each having a cylindrical anode open at one end and surrounded by a water jacket, and an anode circuit for said tubes including a lecher line having a pair of parallel hollow conductors extending longitudinally along a circular path, said conductors being of flattened cross-section at the sides thereof facing each other, means connecting the ends of said conductors to the respective anodes, the flattened sides of said conductors being disposed in parallel relation to the axes of said cylindrical anodes, a short-circuiting bridge occuping an oblique position relative to the longitudinal direction of said line interconnecting the flattened sides of said conductors over substantially the full width thereof, means including an arm coupled to said bridge and pivoted at the center of curvature of said circular path for displacing said bridge along said conductors, and cooling channels extending through said conductors and communicating with said jackets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma Technology (AREA)
  • Particle Accelerators (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US222778A 1950-05-09 1951-04-25 Tunable high-frequency push-pull power amplifier Expired - Lifetime US2662127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL678795X 1950-05-09

Publications (1)

Publication Number Publication Date
US2662127A true US2662127A (en) 1953-12-08

Family

ID=19802369

Family Applications (1)

Application Number Title Priority Date Filing Date
US222778A Expired - Lifetime US2662127A (en) 1950-05-09 1951-04-25 Tunable high-frequency push-pull power amplifier

Country Status (5)

Country Link
US (1) US2662127A (en:Method)
BE (1) BE503080A (en:Method)
DE (1) DE846569C (en:Method)
FR (1) FR1036829A (en:Method)
GB (1) GB678795A (en:Method)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1008679B (de) * 1953-07-08 1957-05-23 Demag Ag Verfahren zur Gewinnung von Kohle u. dgl. aus Floezen mit einem steilen Einfallen
DE1177702B (de) * 1955-04-23 1964-09-10 Siemens Ag Anordnung zum stufenlosen Anpassen eines Hochfrequenzgenerators an den veraenderlichen Widerstand von einzelnen Verbrauchern

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113758A (en) * 1934-10-05 1938-04-12 Philips Nv Tuning device for lecher-wire systems
US2138181A (en) * 1933-01-14 1938-11-29 Rca Corp Short wave signaling
US2156261A (en) * 1936-06-13 1939-05-02 Rca Corp Resonant circuit for ultra high frequency amplifiers
US2370423A (en) * 1941-10-31 1945-02-27 Rca Corp High frequency tank circuit
US2412987A (en) * 1942-04-04 1946-12-24 Standard Telephones Cables Ltd Vacuum tube connection
GB604652A (en) * 1945-03-28 1948-07-07 Standard Telephones Cables Ltd Coupled circuits
US2548770A (en) * 1945-05-30 1951-04-10 John B Caraway Protective arrangement for the neutralization circuits of vacuum tubes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138181A (en) * 1933-01-14 1938-11-29 Rca Corp Short wave signaling
US2113758A (en) * 1934-10-05 1938-04-12 Philips Nv Tuning device for lecher-wire systems
US2156261A (en) * 1936-06-13 1939-05-02 Rca Corp Resonant circuit for ultra high frequency amplifiers
US2370423A (en) * 1941-10-31 1945-02-27 Rca Corp High frequency tank circuit
US2412987A (en) * 1942-04-04 1946-12-24 Standard Telephones Cables Ltd Vacuum tube connection
GB604652A (en) * 1945-03-28 1948-07-07 Standard Telephones Cables Ltd Coupled circuits
US2548770A (en) * 1945-05-30 1951-04-10 John B Caraway Protective arrangement for the neutralization circuits of vacuum tubes

Also Published As

Publication number Publication date
GB678795A (en) 1952-09-10
FR1036829A (fr) 1953-09-11
DE846569C (de) 1952-08-14
BE503080A (en:Method)

Similar Documents

Publication Publication Date Title
GB776923A (en) Travelling wave electron discharge devices
US1979668A (en) Electron discharge device
US2267951A (en) Antenna
US2662127A (en) Tunable high-frequency push-pull power amplifier
US1932448A (en) Conical adapter for microray transmission lines
US2204306A (en) Vacuum tube
USRE22580E (en) Ultra high frequency device with conical collector
US2824257A (en) Traveling wave tube
US3320471A (en) High power amplifier having a cooling fluid manifold attached to the slowwave structure
US2401637A (en) Electron discharge tube
US2526399A (en) Output connection for ultra high frequency devices
US2054126A (en) Magnetically controlled electron discharge device
US3753031A (en) Output devices for microwave tubes such as klystrons, and klystrons incorporating such output devices
US2218309A (en) Thermionic valve apparatus for use on very short wave lengths
US2224649A (en) Ultra high frequency circuits
US3309556A (en) Fluid-cooled traveling wave tube
US2247779A (en) High frequency apparatus
GB634640A (en) Improvements in or relating to magnetrons
US2813212A (en) Electromagnetic cathode ray beam deflection system
US2790857A (en) Output or input circuits for vacuum tubes
US2412987A (en) Vacuum tube connection
US2408216A (en) Beam deflection electron discharge device
US2735033A (en) Traveling wave tube
US2860285A (en) Electron discharge devices
US2542841A (en) High-frequency coupling apparatus