US2020126A - Wireless receiver - Google Patents

Wireless receiver Download PDF

Info

Publication number
US2020126A
US2020126A US472292A US47229230A US2020126A US 2020126 A US2020126 A US 2020126A US 472292 A US472292 A US 472292A US 47229230 A US47229230 A US 47229230A US 2020126 A US2020126 A US 2020126A
Authority
US
United States
Prior art keywords
bands
wireless receiver
frequency
resonant
valve
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 - Lifetime
Application number
US472292A
Inventor
Spencer Richard Kimberley
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.)
RCA Corp
Original Assignee
RCA 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.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2020126A publication Critical patent/US2020126A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection

Definitions

  • the present invention relates to wireless receivers of the type adapted for the reception upon either of two bands of wavelength at will.
  • a wireless receiver of the type referred to is provided with two circuits, one of these circuits having a fixed resonant frequency within one of the wave bands to be received and the other having a fixed resonant frequency-within the other band, both of these circuits being operative when receiving upon either band.
  • the invention may be applied when more than two wave bands are to be dealt wit The invention is illustrated by way of example in the accompanying drawing.
  • the high frequency portion of a wireless receiver comprises two high frequency amplifying valves V1 and V2 followed by a detector valve V3.
  • the anodes of the high frequency amplifiers V1 and V2 are connected to a source of high tension current a through high frequency choke coils b and 0 respectively, and the anode of the first valve V1 is connected to the grid of the second valve V2 through a condenser d.
  • the anode of the second valve V2 is similarly connected to the grid of the detector valve V3 through a condenser e.
  • the grid circuit of the first valve V1 is connected.
  • the two chokes b and c in the anode circuits are so designed in relation to their associated capacities (which may be the self capacity of the coils) that one of them has a resonant frequency within one band of wave lengths to be received and the resonant frequency of the other choke lies within the other band of Wave lengths.
  • the coil capacities are indicated by the dotted condensers k and l.
  • the invention enables the maximum average amplification over the two wave bands to be obtained without loss of stability.
  • condensers may be added to the inherent capacities tuning the chokes but the use of such condensers is preferably avoided.
  • An electric valve amplifier including in combination, a plurality of electric valves arranged 5 in cascade relation to each other and provided with interstage coupling means each including a single choke coil device, each of said choke coils being resonant within separate frequency bands broadly at fixed frequencies, and means for tun- 10 ing the input circuit of the amplifier selectively within each of said separate signal bands.
  • An electric valve amplifier including in combination, a plurality of electric valves arranged in cascade relation to each other and provided 16 s with interstage coupling circuits tuned to respond to signals on separate frequency bands, an input circuit for the amplifier, means for tuning said input circuit selectively to each of said separate signal bands, said tuning means including a va- 20 riable condenser, a plurality of inductances, and a switching device for selectively connecting said inductances separately each with said variable condenser, and said coupling circuits between said valves each including a single impedance 25 coupling element, one of which is in the form of a choke coil resonant at a fixed predetermined signal frequency within one of said bands, and another of which is in the form of a choke coil resonant at another fixed predetermined signal frequency within another of said bands.
  • a multi-range radio receiving system including in combination a plurality of thermionic valves connected in cascade, an input circuit for said system constituted by a plurality of inductors and a condenser, a switching device for selectively connecting one or another of said inductors with said variable condenser to determine to which of several signal bands the system will respond, and a single coupling means of the fixed'tuned type between two successive amplifying valves resonant at a radio frequency within one of said bands and a second single coupling means of the fixed tuned type between two other successive amplifying valves resonant tov a radio frequency within the other of said bands.

Landscapes

  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Amplifiers (AREA)

Description

Nov. 5, 1935.
R. K. SPENCER 2,020,126
wIRELEs RECEIVER Filed Aug; 1, 1930 '-J|mu v mm:
' Inventor-z Richard Kimberley Spencer;
' Attorn Patented Nov. 5, 1935 I UNITED STATES PATENT OFFICE WIRELESS RECEIVER ration of Delaware Application August 1, 1930, Serial No. 472,292 In Great Britain September 5, 1929 3 Claims. (01. 179-171) The present invention relates to wireless receivers of the type adapted for the reception upon either of two bands of wavelength at will.
According to the present invention a wireless receiver of the type referred to is provided with two circuits, one of these circuits having a fixed resonant frequency within one of the wave bands to be received and the other having a fixed resonant frequency-within the other band, both of these circuits being operative when receiving upon either band. The invention may be applied when more than two wave bands are to be dealt wit The invention is illustrated by way of example in the accompanying drawing.
Referring to the drawing, the high frequency portion of a wireless receiver comprises two high frequency amplifying valves V1 and V2 followed by a detector valve V3. The anodes of the high frequency amplifiers V1 and V2 are connected to a source of high tension current a through high frequency choke coils b and 0 respectively, and the anode of the first valve V1 is connected to the grid of the second valve V2 through a condenser d. The anode of the second valve V2 is similarly connected to the grid of the detector valve V3 through a condenser e. The grid circuit of the first valve V1 is connected. by means of a suitable switch f to either of two inductances y and h tunable by means of a variable condenser 2' connected in parallel therewith and this circuit is coupled to the aerial and earth circuit 1'. One of the tunable inductances g and h is used for reception on one wave-band and the other for the other wave-band.
The two chokes b and c in the anode circuits are so designed in relation to their associated capacities (which may be the self capacity of the coils) that one of them has a resonant frequency within one band of wave lengths to be received and the resonant frequency of the other choke lies within the other band of Wave lengths. The coil capacities are indicated by the dotted condensers k and l.
The invention enables the maximum average amplification over the two wave bands to be obtained without loss of stability.
If desired, condensers may be added to the inherent capacities tuning the chokes but the use of such condensers is preferably avoided.
I claim:
1. An electric valve amplifier including in combination, a plurality of electric valves arranged 5 in cascade relation to each other and provided with interstage coupling means each including a single choke coil device, each of said choke coils being resonant within separate frequency bands broadly at fixed frequencies, and means for tun- 10 ing the input circuit of the amplifier selectively within each of said separate signal bands.
2. An electric valve amplifier including in combination, a plurality of electric valves arranged in cascade relation to each other and provided 16 s with interstage coupling circuits tuned to respond to signals on separate frequency bands, an input circuit for the amplifier, means for tuning said input circuit selectively to each of said separate signal bands, said tuning means including a va- 20 riable condenser, a plurality of inductances, and a switching device for selectively connecting said inductances separately each with said variable condenser, and said coupling circuits between said valves each including a single impedance 25 coupling element, one of which is in the form of a choke coil resonant at a fixed predetermined signal frequency within one of said bands, and another of which is in the form of a choke coil resonant at another fixed predetermined signal frequency within another of said bands.
3. A multi-range radio receiving system including in combination a plurality of thermionic valves connected in cascade, an input circuit for said system constituted by a plurality of inductors and a condenser, a switching device for selectively connecting one or another of said inductors with said variable condenser to determine to which of several signal bands the system will respond, and a single coupling means of the fixed'tuned type between two successive amplifying valves resonant at a radio frequency within one of said bands and a second single coupling means of the fixed tuned type between two other successive amplifying valves resonant tov a radio frequency within the other of said bands.
RICHARD KIM'BERLEY SPENCER.
US472292A 1929-09-05 1930-08-01 Wireless receiver Expired - Lifetime US2020126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2020126X 1929-09-05

Publications (1)

Publication Number Publication Date
US2020126A true US2020126A (en) 1935-11-05

Family

ID=10896277

Family Applications (1)

Application Number Title Priority Date Filing Date
US472292A Expired - Lifetime US2020126A (en) 1929-09-05 1930-08-01 Wireless receiver

Country Status (1)

Country Link
US (1) US2020126A (en)

Similar Documents

Publication Publication Date Title
US2215775A (en) Radio receiver
US2281661A (en) Tuning system
US1945096A (en) Convertible band pass receiver
US2020126A (en) Wireless receiver
US2084740A (en) Filter circuit
US2196266A (en) Filter system for multiple channel amplifiers
US2252609A (en) Wide-band coupling circuits
US2038294A (en) Coupling system
US2090513A (en) Tuned circuits
US2124211A (en) Combined amplification and tuning controls
US2517741A (en) Permeability-tuned variable-frequency amplifier
US2129026A (en) Tuning range adjustment device
US2034773A (en) Tunable radio frequency circuits
US2168193A (en) Multiband receiver
US2158251A (en) High-frequency radio amplifying circuits
US1911096A (en) Input system for electrical amplifiers
US1961140A (en) Electrical communication system
US1981071A (en) Amplifier circuits
US1910239A (en) Thermionic tube amplifier
US1921088A (en) Wave signaling system
US2154723A (en) Short wave radio amplifying and receiving system
US2103079A (en) Wave signaling system
US1725433A (en) Band-receiving system
US2835798A (en) V. h. f. -u. h. f.-tuner system
US2137475A (en) Signal selector circuits