GB501760A - Improvements in radio and like receivers - Google Patents

Improvements in radio and like receivers

Info

Publication number
GB501760A
GB501760A GB24229/37A GB2422937A GB501760A GB 501760 A GB501760 A GB 501760A GB 24229/37 A GB24229/37 A GB 24229/37A GB 2422937 A GB2422937 A GB 2422937A GB 501760 A GB501760 A GB 501760A
Authority
GB
United Kingdom
Prior art keywords
selectivity
control
tuning
circuit
amplifier
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
GB24229/37A
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
Marconis Wireless Telegraph 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB24229/37A priority Critical patent/GB501760A/en
Priority to US224428A priority patent/US2221096A/en
Priority to FR842897D priority patent/FR842897A/en
Publication of GB501760A publication Critical patent/GB501760A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H03G5/26—Automatic control in frequency-selective amplifiers having discharge tubes
    • 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
    • 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
    • H03J7/16—Automatic frequency control where the frequency control is accomplished by mechanical means, e.g. by a motor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/14—Automatic detuning arrangements

Abstract

501,760. Automatic tuning and selectivity control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., KEALL, O. E., and RUST, N. M. Sept. 4, 1937, No. 24229. [Class 40 (v)] A radio receiver provided with automatic control both of tuning and selectivity has the two systems interlinked in such manner that operation of the selectivity control causes the tuning control to tune away from an interfering signal. The A.S.C. system shown is applied to an IF amplifier 1 having a forward reaction coupling comprising the screened half-wave line 8, resistances 10, 11 and condenser 9, while negative feed-back is obtained by virtue of coils 18, 19 in the cathode leg. To these coils is coupled a normal type of selectivity control discriminator comprising two circuits 20, 21 tuned 9 kc. above and below the mid-frequency of the I.F. band; the resultant of the two. opposed rectified voltages is applied over 29, 30 as control bias to the amplifier 1 so that selectivity increases as signal strength decreases. The A.F.C. discriminator 36, 37 is of usual type coupled to a further I.F. amplifier 33. The resultant voltage applied over 44 to the frequency correcting device depends on the joint action of the A.F.C. and A.S.C. discriminators, since the resistances 41, 42, 31, 32 are in series. Depending on whether the interference energizes circuit 20 or circuit 21, the A.F.C. control voltage is so modified thereby that the tuning is centred to 'that side of the carrier remote from the interference. The selectivity of stage 1 may be varied in dependence on the relative strength of signal and interference by shunting resistance 23 by a tuned circuit, coupled to a subsequent I.F. stage and tuned to the I.F., in series with a diode rectifier, Fig. 2 (not shown). The variation in selectivity may be effected by a meter movement in the anode circuit of valve 1 which mechanically varies the coupling of the input and output circuits of that stage, Fig. 3 (not shown). Specification 479,991 is referred to.
GB24229/37A 1937-09-04 1937-09-04 Improvements in radio and like receivers Expired GB501760A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB24229/37A GB501760A (en) 1937-09-04 1937-09-04 Improvements in radio and like receivers
US224428A US2221096A (en) 1937-09-04 1938-08-12 Radio receiver control circuits
FR842897D FR842897A (en) 1937-09-04 1938-09-02 Improvements in radio receivers and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24229/37A GB501760A (en) 1937-09-04 1937-09-04 Improvements in radio and like receivers

Publications (1)

Publication Number Publication Date
GB501760A true GB501760A (en) 1939-03-06

Family

ID=10208426

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24229/37A Expired GB501760A (en) 1937-09-04 1937-09-04 Improvements in radio and like receivers

Country Status (3)

Country Link
US (1) US2221096A (en)
FR (1) FR842897A (en)
GB (1) GB501760A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607889A (en) * 1945-06-23 1952-08-19 Emi Ltd Radio receiver
US2523294A (en) * 1946-03-16 1950-09-26 Farnsworth Res Corp Self-tuning amplifier
US2773119A (en) * 1950-04-04 1956-12-04 Louis W Parker Tuning system for radio and television receivers

Also Published As

Publication number Publication date
US2221096A (en) 1940-11-12
FR842897A (en) 1939-06-21

Similar Documents

Publication Publication Date Title
US2152515A (en) Automatic signal interference control
GB617254A (en) Improvements in diversity radio receiving systems
GB625258A (en) Improvements in or relating to modulated carrier wave receivers
US2280563A (en) Automatic selectivity control circuit
US2410981A (en) Superregenerative receiver circuits
GB501760A (en) Improvements in radio and like receivers
US2420249A (en) Amplitude modulation reducing circuit
US2528182A (en) Frequency discriminator network
US2177713A (en) Frequency-selective network
GB586534A (en) Improvements in or relating to super-regenerative radio receivers
US2172456A (en) Automatic frequency control circuit
GB559535A (en) Detector and automatic volume control circuit for frequency modulation receivers
US2280187A (en) Carrier-signal receiver
US2501122A (en) Angle modulation receiver
US2612602A (en) Noise suppression circuit
US2248229A (en) Frequency controlling system
US2069837A (en) Automatic gain control circuits
US1897735A (en) Multiple range radio receiving system
US2248753A (en) Frequency control system
GB493511A (en) Automatic frequency control circuits for radio receivers
US2281876A (en) green
GB415060A (en) Improvements in or relating to modulated carrier wave receivers, particularly for radio receivers
US2140141A (en) Radio circuit
GB462832A (en) Control of selectivity in radio receivers
GB443956A (en) Improvements in and relating to radio receivers