GB536505A - Improvements in permeability-tuned oscillator tracking arrangement - Google Patents

Improvements in permeability-tuned oscillator tracking arrangement

Info

Publication number
GB536505A
GB536505A GB5099/40A GB509940A GB536505A GB 536505 A GB536505 A GB 536505A GB 5099/40 A GB5099/40 A GB 5099/40A GB 509940 A GB509940 A GB 509940A GB 536505 A GB536505 A GB 536505A
Authority
GB
United Kingdom
Prior art keywords
coil
signal
cores
frequency
range
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
Application number
GB5099/40A
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.)
Johnson Laboratories Inc
Original Assignee
Johnson Laboratories Inc
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 Johnson Laboratories Inc filed Critical Johnson Laboratories Inc
Publication of GB536505A publication Critical patent/GB536505A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

536,505. Wireless receiving apparatus; inductances. JOHNSON LABORATORIES, Inc. March 19, 1940, No. 5099. Convention date, April 10, 1939. [Class 40 (v)] [Also in Group XXXV] To improve tracking in a permeability tuning arrangement for a superheterodyne receiver the signal frequency coil 5 and oscillator coil 18 are constructed as shown in Fig. 2. The coils are mounted on insulating tubes 27 and have identical dust cores 6 simultaneously slidable by means 28. Signal coil 5 is uniformly spaced while oscillator coil 18 comprises closely spaced sections 18a, 18c separated by a loosely spaced section 18b. Section 18a is of the same length as 5 but has fewer turns. Movement of cores 6 tunes signal coil 5 over a range of frequencies and oscillator coil 18 over a narrower range of higher frequencies, to give a constant difference. With the cores withdrawn, alignment is established by means of adjustable condensers (not shown) and, is maintained during the upper portion of the frequency range by the fact that as the inductance of 18a is increasing, the inductance of 18a is decreasing due to withdrawal of the core 6. During the lower part of the frequency range tracking is secured by having the signal core 6 earthed so that the increased capacity with coil 5 accelerates the lowering of the resonant frequency of the signal frequency circuit. Specifications 366,475 and 455,573, [Group XXXVI], are referred to.
GB5099/40A 1939-04-10 1940-03-19 Improvements in permeability-tuned oscillator tracking arrangement Expired GB536505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US266969A US2190048A (en) 1939-04-10 1939-04-10 Permeability-tuned oscillator tracking arrangement

Publications (1)

Publication Number Publication Date
GB536505A true GB536505A (en) 1941-05-16

Family

ID=23016747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5099/40A Expired GB536505A (en) 1939-04-10 1940-03-19 Improvements in permeability-tuned oscillator tracking arrangement

Country Status (2)

Country Link
US (1) US2190048A (en)
GB (1) GB536505A (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL61935C (en) * 1940-05-17
NL59335C (en) * 1940-12-05
DE969506C (en) * 1941-04-11 1958-06-12 Siemens Ag Variometer
US2424506A (en) * 1942-10-24 1947-07-22 Rca Corp Permeability-tuned short-wave spread-band receiver
US2486986A (en) * 1943-06-28 1949-11-01 Rca Corp Permeability tuning system
US2552999A (en) * 1946-08-31 1951-05-15 Pye Ltd Method of making inductances
US2609491A (en) * 1948-01-21 1952-09-02 Karl F Kirchner Resonant circuits
US2496058A (en) * 1948-05-22 1950-01-31 Rca Corp Permeability tuner
US2621324A (en) * 1948-07-21 1952-12-09 Rca Corp Permeability tuned variable inductance
DE952008C (en) * 1948-10-02 1956-11-08 Blaupunkt Werke G M B H Zweign Overlay receiver with inductivity adjustment
US2679007A (en) * 1949-07-15 1954-05-18 Rca Corp Variable inductance circuits
US2697165A (en) * 1949-11-15 1954-12-14 Gen Motors Corp Oscillator coupling system
DE945263C (en) * 1950-04-04 1956-07-05 Blaupunkt Werke G M B H Zweign Arrangement for band spreading in high-frequency receivers
DE942645C (en) * 1950-12-03 1956-05-03 Stettner & Co Tunable electrical oscillating circuit
US2750495A (en) * 1951-11-20 1956-06-12 Motorola Inc Receiver which tunes by adjusting magnetic core antenna
US2882392A (en) * 1955-03-09 1959-04-14 Rca Corp Receiver tuned by inductors with tracking by initial positionment of coils on cores

Also Published As

Publication number Publication date
US2190048A (en) 1940-02-13

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