GB973421A - Improvements in or relating to variable frequency oscillators - Google Patents

Improvements in or relating to variable frequency oscillators

Info

Publication number
GB973421A
GB973421A GB453761A GB453761A GB973421A GB 973421 A GB973421 A GB 973421A GB 453761 A GB453761 A GB 453761A GB 453761 A GB453761 A GB 453761A GB 973421 A GB973421 A GB 973421A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillator
output
filter
phase discriminator
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
GB453761A
Inventor
George Lambert Grisdale
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB453761A priority Critical patent/GB973421A/en
Publication of GB973421A publication Critical patent/GB973421A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H03L7/185—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using a mixer in the loop

Landscapes

  • Control Of Voltage And Current In General (AREA)

Abstract

973,421. Automatic frequency control systems. MARCONI CO. Ltd. Sept. 11, 1961 [Feb. 7, 1961], No. 4537/61. Addition to 839,656. Heading H3A. A variable frequency channelized oscillator 10 is stabilized at intervals of 1 kc./s. by (1) beating it with a selected harmonic of a stable 1 mc./s. source in a mixer 9 to derive an output from filter 111 of frequency less than 1 mc./s., then (2) dividing the filter output by an integer factor selectable between 500 and 1000 in a frequency divider 13 to derive a 1 kc./s. output which is then compared in a phase discriminator 114 with a 1 kc./s. oscillation obtained by frequency division at 15 from the 1 mc./s. stable oscillator. The phase discriminator output then stabilizes the oscillator 10, through a reactance tube 16, at 1 kc./s. intervals according to the selected division factor. The frequency division range 500-1000 alone suffices (instead of 1-1000) provided a ganged control means GC is used to reverse by a changeover switch S the polarity of the output of the phase discriminator and, in the case of additional frequency fractions selected for the oscillator of less than ¢ mc./s., to conjointly select the next higher of the 1 mc./s. harmonics from which the channelized oscillator frequency is subtracted in the filter 111. The gang control GC may operate a pair of indicator scales, one indicating the actual range of frequency divided, the other the complement to 1 mc./s. of the actual range of frequencies divided to 1 kc./s.
GB453761A 1961-02-07 1961-02-07 Improvements in or relating to variable frequency oscillators Expired GB973421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB453761A GB973421A (en) 1961-02-07 1961-02-07 Improvements in or relating to variable frequency oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB453761A GB973421A (en) 1961-02-07 1961-02-07 Improvements in or relating to variable frequency oscillators

Publications (1)

Publication Number Publication Date
GB973421A true GB973421A (en) 1964-10-28

Family

ID=9779048

Family Applications (1)

Application Number Title Priority Date Filing Date
GB453761A Expired GB973421A (en) 1961-02-07 1961-02-07 Improvements in or relating to variable frequency oscillators

Country Status (1)

Country Link
GB (1) GB973421A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206421A (en) * 1976-09-17 1980-06-03 Siemens Aktiengesellschaft Arrangement for synchronizing a free-swinging oscillator
DK151753B (en) * 1976-09-17 1987-12-28 Siemens Ag CLUTCH TO SYNCHRONIZE A FREE-FLING OSCILLATOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206421A (en) * 1976-09-17 1980-06-03 Siemens Aktiengesellschaft Arrangement for synchronizing a free-swinging oscillator
DK151753B (en) * 1976-09-17 1987-12-28 Siemens Ag CLUTCH TO SYNCHRONIZE A FREE-FLING OSCILLATOR

Similar Documents

Publication Publication Date Title
US2838673A (en) Wide-range captive oscillator system
GB1094653A (en) Improvements in or relating to superheterodyne receivers
GB1325219A (en) Variable frequency oscillator systems
GB654355A (en) Improvements in frequency changing arrangements for radio transmitters
GB973421A (en) Improvements in or relating to variable frequency oscillators
GB1155371A (en) Frequency Divider
GB1022965A (en) Improvements in or relating to variable frequency signal generators
GB1160794A (en) Adjustable Frequency Atomic Frequency Standard
GB1147362A (en) Phase locked crystal controlled voltage variable oscillator
GB1026654A (en) Signal generator
US2860246A (en) Frequency control system
GB971983A (en) Frequency-stabilized oscillation generator system
GB670877A (en) Improvements in or relating to means for generating oscillations at equally spaced frequencies
US2864956A (en) Stabilization system for tunable oscillator with reference to a pair of stable oscillators
GB714684A (en) Improvements in devices for frequency selections
GB1211971A (en) Frequency synthesizer apparatus
JPS54121610A (en) Pll circuit of radio receiver
GB913364A (en) Improvements in or relating to tunable electric oscillators employing frequency stabilisation
SU545063A1 (en) Standard frequency grid former with quartz frequency stabilization
GB1037583A (en) Improvements in or relating to variable frequency oscillation generators
GB912607A (en) Improvements in frequency stabilised radio oscillation generators
ES477973A1 (en) Frequency synthesizer controller
GB1125916A (en) Improvements in or relating to frequency synthesisers
GB1064952A (en) Improvements in or relating to frequency synthesisers
SU470902A1 (en) Frequency synthesizer