GB1285526A - Improvements in or relating to frequency control circuits - Google Patents

Improvements in or relating to frequency control circuits

Info

Publication number
GB1285526A
GB1285526A GB23681/71A GB2368171A GB1285526A GB 1285526 A GB1285526 A GB 1285526A GB 23681/71 A GB23681/71 A GB 23681/71A GB 2368171 A GB2368171 A GB 2368171A GB 1285526 A GB1285526 A GB 1285526A
Authority
GB
United Kingdom
Prior art keywords
amplifier
frequency
discriminator
oscillator
circuit
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
GB23681/71A
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.)
Siemens Schweiz AG
Original Assignee
Siemens Albis AG
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 Siemens Albis AG filed Critical Siemens Albis AG
Publication of GB1285526A publication Critical patent/GB1285526A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
    • G01S13/84—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted for distance determination by phase measurement
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal

Abstract

1285526 Automatic frequency control circuit SIEMENS ALBIS AG 19 April 1971 [26 March 1970] 23681/71 Heading H3A An A.F.C. circuit for a transceiver of a distance measuring system comprises a local oscillator 1 controlled by the output of a frequency discriminator 8, there being provided a hunting circuit for sweeping oscillator 1 consisting of a capacitor 2 and a resistor 3 connected via an amplifier 4 and a resistor 12 to the discriminator 8 and via a further resistor 6 to a blocking potential source - U. At a sub-station a switch 5 connecting source - U via a monostable circuit 9 to a control amplifier 4 is closed so that the amplifier is blocked and no charge voltage US exists across 2 so that oscillator 1 operates at its normal frequency f N (Fig. 2, not shown). At the main station the switch 5 is opened, indicating a change in logical state from "1" to "0" and the monostable circuit 9 produces a positive pulse causing amplifier 4 to saturate and capacitor 2 to commence charging so that the oscillator frequency shifts from f N to f E on the other side of hunted frequency f H , which differs from f N by the intermediate frequency to which circuits 11, 8 are tuned, the discriminator output being ineffective during the frequency shift as the amplifier 4 is already saturated. At the end of the pulse period, amplifier 4 is blocked and capacitor 2 starts discharging so that a sweep of the oscillator 1 commences from f E till f H when it falls within the capture range of the discriminator 8 when the discriminator output is allowed to pass via amplifier 4 for effecting automatic control of 1.
GB23681/71A 1970-05-26 1971-04-19 Improvements in or relating to frequency control circuits Expired GB1285526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH461070A CH507616A (en) 1970-05-26 1970-05-26 Frequency control circuit for a transceiver of an electrical distance measuring system that can be switched either as a main or as a secondary station

Publications (1)

Publication Number Publication Date
GB1285526A true GB1285526A (en) 1972-08-16

Family

ID=4279306

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23681/71A Expired GB1285526A (en) 1970-05-26 1971-04-19 Improvements in or relating to frequency control circuits

Country Status (4)

Country Link
CH (1) CH507616A (en)
DE (1) DE2034719B2 (en)
GB (1) GB1285526A (en)
ZA (1) ZA711637B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2217967C2 (en) * 1972-04-14 1984-03-08 ANT Nachrichtentechnik GmbH, 7150 Backnang Frequency control for radio relay station - avoids unwanted frequencies using phase discriminator to compare mixer with crystal and tune free-running oscillator

Also Published As

Publication number Publication date
CH507616A (en) 1971-05-15
ZA711637B (en) 1971-12-29
DE2034719B2 (en) 1971-12-02
DE2034719A1 (en) 1971-12-02

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee