US2397701A - Frequency control in ultra high frequency circuit - Google Patents
Frequency control in ultra high frequency circuit Download PDFInfo
- Publication number
- US2397701A US2397701A US513355A US51335543A US2397701A US 2397701 A US2397701 A US 2397701A US 513355 A US513355 A US 513355A US 51335543 A US51335543 A US 51335543A US 2397701 A US2397701 A US 2397701A
- Authority
- US
- United States
- Prior art keywords
- frequency
- lecher
- space charge
- wires
- lecher wires
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/14—Controlling the magnetic state of inductor cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B17/00—Hoistway equipment
- B66B17/14—Applications of loading and unloading equipment
- B66B17/26—Applications of loading and unloading equipment for loading or unloading mining-hoist skips
-
- 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
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
- H03B5/1817—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
- H03B5/1835—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a vacuum tube
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
- H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
- H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C7/00—Modulating electromagnetic waves
- H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
-
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
- H03H5/003—One-port networks comprising only passive electrical elements as network components comprising distributed impedance elements together with lumped impedance elements
Definitions
- This invention relates to thermionic ultra-highfrequency oscillation generators of the kind having a variable tuned regenerative feedback circuit between the anode and control grid and consisting of distributed impedances such as Lecher wires, co-axial lines and hollow resonators as opposed to tuned'circuits comprising lumped inductances and lumped capacity.
- the tuned circuit comprises a pair of Lecher wires varied in effective electrical length and characteristic impedance by means of the space charge in a vacuum tube.
- the vacuumtube has two parallel conductors sealed in its envelope and these conductors are arranged as parts of or extension to the Lecher wires. Between the conductors in the vacuum tube are disposed electrodes for setting up a variable space charge. These electrodes normally comprise a thermionic cathode and a grid system. Alteration of the potential upon.
- the parts or extensions of the Lecher wires within the vacuum tube is varied.
- the capacity is varied due to the change in electron distribution, the inductance of the Lecher system remains substantially unaffected, since the permeability of the dielectric and the efiective diameter of the wires are substantially unchanged.
- quency oscillation generator is indicated at OSC and comprises a thermionic valve V having a tuned circuit connected between the anode A and grid G.
- This tuned circuit comprises Lecher wires -via the H. T.+ terminal and the Lecher wire Li,
- the frequency of the generator CS0 is controlled by varying in effect theelectrical length of the Lecher wires by means of a space charge.
- the vacuum tube T is provided.
- This tube consists of a cathode K, control grid. GI, screen grid. G2 and the Lecher wires L3, L4 already referred to.
- These parallel conductors L3, L4 are sealed in the envelope of the tube T, and between them in the vacuum tube are disposed the electrodes, K, GI and G2 for setting up a. variable space charge.
- the cathode K is shown as indirectly heated from an alternating source of current.
- the Lecher wires L3, L4 are biassed sufliciently negative through resistance R by a potential applied at B3 to prevent them from drawing current during any part of the high frequency cycle.
- the screen grid G2 is maintained at a positive potential by a potential applied at Bl, while the control grid GI is kept at a negative potential by a potential applied at B2.
- a space charge is developed between the screen grid and the Lecher wires and dependsupon the potentials on the grids or the potentials upon the conductors of the Lecher system; the efiective capacity between the Lecher wires is dependent upon this space charge and may thus be varied by varying the potentials on the screen grid or control grid or the Lecher wires or more than one of these members, thereby altering the tuning of the anode-grid circuit of the oscillation generator OSC and therefore the frequency generated.
- the arrangement is particularly suitable for automatic frequency regulation since a voltage varying in accordance with fluctuations in frean ultra-high fretor may be employed to derive -aporrectingvoltage which in turn is applied in the manneride scribed to change the oscillator frequency to correct the intermediate frequency; i
- Oscillation generator employing distributed impedance elements to determine-frequency, including means for setting up-an electronic space charge between-at least two portions of said distributed impeda'nces, saidmeans being separated from said impedances, andmeans for varying the density of said electronic'space charge, whereby the frequency exhibited by said generator is correspondinglyvaried, V l
- said tuned circuit comprises a pair of Lecher wires and including a vacuum tube arranged so that said Lecher wires extend at least in part into operative juxtaposition therewith but spaced from the electrodes'thereo'f, said vacuum tube including means for varying the effective space charge between said Lecher wires.
- Oscillation generator employing Lecher wires for frequency determination and including a vacuum tube arranged so that said Lecher wires extend at least in part into the interior of said tube butspaced from the electrodes thereof, said vacuum tube including means for varying the effective space charge between said Lecher wires.
- Oscillation generator according to claim 4, andalso including a co-axial group of electrodes for'producing; said space charge, located between the two conductors of said Lecher system, whereby the space charge is varied by varying the potential on at least one; of said electrodes;
- Oscillation generator according to 1013111112; in which said distributed impedances comprise; Lecher wires and-also including a space chargevacuum tube, said Lecher wires extending at least partly outside said vacuum tube butclosely adjacent to the walls thereof wherebyalteration of the space charge withinsaid tube produces alteration of theefiective capacity between the portions of said Lecher wires adjacent to said vacuum tube.
- said distributed impedances comprise Lecher wires and also including a-space charge vacuumtube, said Lecher wires extending at least partly within said vacuum tube, said tube including within theenvelope-thereof a co-axial electrode structurecomprising an axial cathode and a, co-axial gridsystemandtwo rods sealed in the envelope toextend parallel to each other along opposite sides of the electrode structure, said electrode structure afiordingcontrol of said electronic space charge and said rodsacting as internal extensions of said Lecher wires,
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3186/40A GB558454A (en) | 1940-02-20 | 1940-02-20 | Improvements relating to frequency control in ultra-high-frequency circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
US2397701A true US2397701A (en) | 1946-04-02 |
Family
ID=32109231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US513355A Expired - Lifetime US2397701A (en) | 1940-02-20 | 1943-12-08 | Frequency control in ultra high frequency circuit |
Country Status (5)
Country | Link |
---|---|
US (1) | US2397701A (de) |
BE (1) | BE472809A (de) |
FR (1) | FR942934A (de) |
GB (1) | GB558454A (de) |
NL (1) | NL136703B (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2531301A (en) * | 1945-02-08 | 1950-11-21 | Hartford Nat Bank & Trust Co | Circuit arrangement for frequency controls |
US2568395A (en) * | 1948-08-30 | 1951-09-18 | Rca Corp | Controlled wave energy generator |
WO2002010559A1 (en) | 2000-07-31 | 2002-02-07 | Firewall Forward Technologies, Llc. | Camshaft lubrication system |
-
0
- NL NL136703D patent/NL136703B/xx unknown
-
1940
- 1940-02-20 GB GB3186/40A patent/GB558454A/en not_active Expired
-
1943
- 1943-12-08 US US513355A patent/US2397701A/en not_active Expired - Lifetime
-
1947
- 1947-01-22 FR FR942934D patent/FR942934A/fr not_active Expired
- 1947-04-25 BE BE472809D patent/BE472809A/xx unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2531301A (en) * | 1945-02-08 | 1950-11-21 | Hartford Nat Bank & Trust Co | Circuit arrangement for frequency controls |
US2568395A (en) * | 1948-08-30 | 1951-09-18 | Rca Corp | Controlled wave energy generator |
WO2002010559A1 (en) | 2000-07-31 | 2002-02-07 | Firewall Forward Technologies, Llc. | Camshaft lubrication system |
Also Published As
Publication number | Publication date |
---|---|
BE472809A (de) | 1947-10-25 |
NL136703B (de) | |
GB558454A (en) | 1944-01-06 |
FR942934A (fr) | 1949-02-22 |
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