GB1199643A – Improvements in and relating to the Tuning of Two-channel Radio Receivers
– Google Patents
GB1199643A – Improvements in and relating to the Tuning of Two-channel Radio Receivers
– Google Patents
Improvements in and relating to the Tuning of Two-channel Radio Receivers
Info
Publication number
GB1199643A
GB1199643A
GB40342/67A
GB4034267A
GB1199643A
GB 1199643 A
GB1199643 A
GB 1199643A
GB 40342/67 A
GB40342/67 A
GB 40342/67A
GB 4034267 A
GB4034267 A
GB 4034267A
GB 1199643 A
GB1199643 A
GB 1199643A
Authority
GB
United Kingdom
Prior art keywords
coupled
frequency
discriminator
circuits
carrier
Prior art date
1966-09-08
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
GB40342/67A
Inventor
Rufus Franklin Shelby
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.)
Space Systems Loral LLC
Original Assignee
Philco Ford Corp
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.)
1966-09-08
Filing date
1967-09-04
Publication date
1970-07-22
1967-09-04
Application filed by Philco Ford Corp
filed
Critical
Philco Ford Corp
1970-07-22
Publication of GB1199643A
publication
Critical
patent/GB1199643A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H03J7/08—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 using varactors, i.e. voltage variable reactive diodes
Abstract
1,199,643. Automatic frequency control. PHILCO FORD CORP. 4 Sept., 1967 [8 Sept., 1966], No. 40342/67. Heading H3A. A television receiver including automatic frequency control by means of a frequency discriminator, is characterized in that the discriminator responds to the amplitudemodulated video I.F. signal but not to the frequency modulated audio signal. In Fig. 1 the I.F. amplifier 6 is coupled to tuned circuits 10 and 12 tuned above and below the required intermediate frequency; these circuits are coupled by detection diodes 20, 30 to transistors 24, 34 the collectors of which are coupled through D.C. blocking capacitors 51 and 62 to rectifier circuits which supply voltages to the anode and cathode of a varactor diode 70 reverse biased by the potential divider 66, 69. The varactor diode 70 is coupled to the local oscillator 4 to tune it to the required frequency. If the input to the discriminator is unmodulated in amplitude, the outputs of the transistors have only a direct current component which is blocked by the capacitors 51 and 62, so the receiver will not lock on to the audio carrier but will lock to the video carrier. An indicator such as meter 73 indicates when an amplitude modulated carrier is being received.
GB40342/67A
1966-09-08
1967-09-04
Improvements in and relating to the Tuning of Two-channel Radio Receivers
Expired
GB1199643A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US57786566A
1966-09-08
1966-09-08
Publications (1)
Publication Number
Publication Date
GB1199643A
true
GB1199643A
(en)
1970-07-22
Family
ID=24310461
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB40342/67A
Expired
GB1199643A
(en)
1966-09-08
1967-09-04
Improvements in and relating to the Tuning of Two-channel Radio Receivers
Country Status (4)
Country
Link
US
(1)
US3502988A
(en)
BR
(1)
BR6790530D0
(en)
DE
(1)
DE1591377A1
(en)
GB
(1)
GB1199643A
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3624512A
(en)
*
1969-06-02
1971-11-30
Rca Corp
Automatic frequency control system
US3706932A
(en)
*
1971-01-07
1972-12-19
Us Navy
Amplitude independent, automatic frequency control/discriminator
US4321624A
(en)
*
1978-10-30
1982-03-23
Rca Corporation
AFT Circuit
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3110004A
(en)
*
1961-04-21
1963-11-05
Avco Corp
Frequency selector using voltage-sensitive capacitors for tuning and bandwidth control
US3150322A
(en)
*
1962-08-20
1964-09-22
Hewlett Packard Co
Receiver signal locking apparatus using trigger circuit in control loop
US3382441A
(en)
*
1965-03-22
1968-05-07
Automatic Radio Mfg Co
Automatic frequency control with temperature compensated d-c component
US3345464A
(en)
*
1966-11-09
1967-10-03
Sylvania Electric Prod
Fm stereo indicator circuitry
1966
1966-09-08
US
US577865A
patent/US3502988A/en
not_active
Expired – Lifetime
1967
1967-06-19
BR
BR190530/67A
patent/BR6790530D0/en
unknown
1967-09-04
GB
GB40342/67A
patent/GB1199643A/en
not_active
Expired
1967-09-08
DE
DE19671591377
patent/DE1591377A1/en
active
Pending
Also Published As
Publication number
Publication date
DE1591377A1
(en)
1970-07-30
US3502988A
(en)
1970-03-24
BR6790530D0
(en)
1973-09-20
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Legal Events
Date
Code
Title
Description
1970-12-02
PS
Patent sealed [section 19, patents act 1949]
1983-04-07
PCNP
Patent ceased through non-payment of renewal fee
