GB731592A - Improvements in or relating to circuits for producing frequency or phase modulation - Google Patents

Improvements in or relating to circuits for producing frequency or phase modulation

Info

Publication number
GB731592A
GB731592A GB7751A GB7751A GB731592A GB 731592 A GB731592 A GB 731592A GB 7751 A GB7751 A GB 7751A GB 7751 A GB7751 A GB 7751A GB 731592 A GB731592 A GB 731592A
Authority
GB
United Kingdom
Prior art keywords
circuits
modulating
phase
valve
earthedgrid
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
GB7751A
Inventor
Ronald Hamer
Ivor Albert Ravenscroft
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB7751A priority Critical patent/GB731592A/en
Publication of GB731592A publication Critical patent/GB731592A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation

Landscapes

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

Abstract

731,592. Phase modulation; valve generating circuits. POSTMASTER-GENERAL. Nov. 18, 1952 [Jan. 1, 1951], No. 77/51. Classes 40 (5) and 40 (6). A circuit for producing phase or frequency modulation comprises two or more earthedgrid valve amplifying stages, the phase change in which is determined mainly by the input conductance and capacitance of the following stage, which are varied by varying the mutual conductance of the said stage. The earthedgrid stages may be arranged between an oscillation generator and an output circuit, phase modulation being produced by application of a signal to their grid-cathode circuits, Figs. 1, 3 (not shown). Frequency modulation may be obtained by preliminary differentiation of the modulating signal. Alternatively the earthedgrid stages V1, V2, V3 may be arranged in the back-coupling circuit of a self-oscillating valve V4, the modulating source M being connected to their grid circuits. The latter also include, in their common cathode branches, inductors L<SP>1</SP>1, L<SP>1</SP>2, L<SP>1</SP>3 offering high impedances to the carrier frequency and resistors R<SP>1</SP>1, R<SP>1</SP>2, R<SP>1</SP>3, affording cathode bias and negative feed-back at the modulating frequencies. The anode circuits are decoupled at modulating frequencies by inductors L4, L5, L6 and the modulating source M is bridged by a low resistor R<SP>1</SP>4 and decoupling capacitor C<SP>1</SP>4. The mean oscillator frequency is adjusted by variation of resistor R<SP>1</SP>3 and the phase-modulated output is derived from the screen grid of valve V4.
GB7751A 1951-01-01 1951-01-01 Improvements in or relating to circuits for producing frequency or phase modulation Expired GB731592A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7751A GB731592A (en) 1951-01-01 1951-01-01 Improvements in or relating to circuits for producing frequency or phase modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7751A GB731592A (en) 1951-01-01 1951-01-01 Improvements in or relating to circuits for producing frequency or phase modulation

Publications (1)

Publication Number Publication Date
GB731592A true GB731592A (en) 1955-06-08

Family

ID=9698000

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7751A Expired GB731592A (en) 1951-01-01 1951-01-01 Improvements in or relating to circuits for producing frequency or phase modulation

Country Status (1)

Country Link
GB (1) GB731592A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1277945B (en) * 1963-09-11 1968-09-19 Marconi Co Ltd Frequency modulated oscillator circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1277945B (en) * 1963-09-11 1968-09-19 Marconi Co Ltd Frequency modulated oscillator circuit

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