US2487857A - Channelized high-frequency signal receiving system - Google Patents
Channelized high-frequency signal receiving system Download PDFInfo
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- US2487857A US2487857A US629991A US62999145A US2487857A US 2487857 A US2487857 A US 2487857A US 629991 A US629991 A US 629991A US 62999145 A US62999145 A US 62999145A US 2487857 A US2487857 A US 2487857A
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- 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
Definitions
- the amplified Waves from device 2 are applied to a mixer or frequency converter stage il which Y may take the form of any Well-known frequency converter tube such as conventionally used in the frequency conversion stage of a superheterodyne radio receiver.
- a local oscillator beat frequency which is generated by the local oscillator 5 which may be of any Well-known electron tube type having an adjustable frequency-determining or tuning element which is schematically illustrated b-y the arrow E.
- Oscillator 5 is of the type which is stabilized at its selected or tuned frequency by means of a particular one of the series of piezo crystals l to I6.
- the frequencies from oscillator 5 are multiplied in frequency by any Well-known frequency multiplier Il whereby the actual beat frequency applied to mixer 4 is ten times the frequency of the selected crystal.
- crystal 'I may have a frequency of 9.5 megacycles and each of the succeeding crystals may have a frequency which is 0.1 megacycle greater than the 4preceding crystal.
- the respective crystal frequencies are indicated in the drawing by the frequencies adjacent each of their respective conductors which are connected to corresponding stationary contacts in the contact bank of a rotary switch I8.
- the rotatable brush I of this switch can therefore select any desired one of the crystals for connection to the oscillator 5.
- the tuning elements 3, 6, and the brush I9 are ⁇ ganged together to a common tuning indicator dial 20 so that tuning of the amplifier 2 to any .desired frequency channel in the band 108 to 118 megacycles, automatically connects the proper .crystal in circuit and automatically tunes the -oscillator to the corresponding channel fre- .quency
- the numerals above the respective blocks represent a particular selected spot frequency, While the numerals below the respective blocks indicate the respective frequency bands.
- the gauging of the various elements 3, 5 and I9 is such that the resultant beat frequency in the output of mixer 4 is confined to the band 13 to 13.9 megacycles, it being understood that the filter 2l is of the band pass type to cover the 13 to 13.9 megacycle band.
- may be of any Well-known band pass type and may, if desired, include a corresponding band amplifier.
- the signals from device 2! are then applied to another mixer or frequency converter 22 which in turn is supplied With a local beat frequency from the local oscillator 23.
- Oscillator 23 is provided With a tuning element 2li so that the oscillator can be tuned over the band 9.5 to 10.4 megacycles as is the oscillator 5 already described.
- the oscillator 23 is of the crystal stabilized type and is connected to the rotary brush 25 of a switch whose stationary bank contacts are multipled to the respective crystals l to I0.
- the brush 25 and the tuning element 2d are ganged through a suitable gearing or ratio coupling 25 to the dial 20 so that for each tenth of a turn of the dial 20 the brush 25 makes a complete revolution, it being understood that the previously described brush i9 is ganged to the dial 29 so that brush I9 makes a complete revolution for each complete revolution of dial 20.
- the received band of 108 to 118 megacycles may be considered as divided into 100 separate frequency channels, each channel having a Width of approximately 0.1 megacycle.
- the tuning element 3 is tuned to any channel between 108 and 108.9 megacycles the brush I9 is in engagement with stationary contact 2.
- the brush 25 and the tuning element '2li of oscillator 23 can be independently adjusted so that they are not ganged to the dial 26. Under that condition there would be provided two tuning knobs or dials, namely the dial 20 and another dial which controls the brush 25 and the oscillator tuning element 24.
- the dial 2B would then be calibrated in one megacycle steps, and the dial for oscillator 23 would be calibrated in ten steps from 0.1 megacycle to 0.9 megacycle.
- a radio receiving system of the type adapted to receive on a plurality of selectable input carrier frequencies the frequencies being divisible into X groups and with Y frequencies in each group, a plurality of successive frequency converter stages of the superheterodyne type for the received carrier frequencies, means selectively to vsupplyfthe ⁇ succeeding ⁇ stage 'with-any desired one of Y beating oscillations of differentfreqnencies from those supplied to 4the iirst stage, a bank of piezo crystals the number of Acrystals being equal to XLand each crystal Lbeing capable of simulv ⁇ taneously fstabilizing the Ilocal 'beating oscilla- "tionsf'of both said stages, a lplurality of switches reach switchhaving asset lof bank contacts ,and -a selectively movable brush, said crystalsbeing connected in multiple to the bank contacts of each switch, and said brushes being individually connected to the corresponding local oscillator generator for each of said stages, to enable a single crystal to simultaneously
- a radio receiver of the double superheterodyne type to receive on any one of a plurality of selectable input frequencies and comprising a pair of successive frequency conversion stages, means including an oscillator generator to supply one stage with local beating oscillations, means including another oscillator generator to supply the preceding stage with local beating oscillations whose frequencies are multiples of the first-mentioned beating oscillations, a plurality of piezo crystals, each crystal being connectable simultaneously to both said generators to stabilize their respective frequencies, a multi-point switch for connecting a selected one of said crystals to the first-mentioned oscillator generator, another multi-point switch for connecting said selected crystal or any other one of said crystals to the second-mentioned oscillator generator and thereby maintaining the converted frequency from said one stage uniform, regardless of the frequency to which the receiver is tuned.
- each of said switches includes a set of fixed contacts one for each crystal, the fixed contacts in both switches being connected in multiple to said crystals for connecting them in different combinations to said oscillator generators.
- a radio receiving system of the type adapted to receive a plurality of selectable input carrier frequencies, a plurality of successive frequency converter stages of the superheterodyne type for the received carrier frequencies, means including an oscillator-generator to supply one stage with local beating oscillations, means including another oscillator-generator to supply a succeeding stage with local beating oscillations of a frequency different from the first-mentioned beating oscillations, means to tune each oscillator to a plurality of beating frequencies, a single bank of piezoelectric crystals common to both said oscillators, and switching means for connecting any one of said crystals to both oscillators to control both oscillators simultaneously, and also for connecting said crystals in different combinations respectively to said oscillators and thereby to maintain the converted frequency of said succeeding stage constant, for any one of said selected input frequencies.
- a radio receiver of the double superheterodyne type having an input radio frequency i crystal-.controlled.tunable oscillator which-is con- ⁇ vnected to said-first converterthroughaifrequency multiplier, va .second frequency converter which is z-ccnnected to the output of said :first-converter to produce a'finaliintermediate frequency, a secf-ond source oflocal beating oscillations for :said second converter .and including another :tunable crystal-controlled oscillator which is connectedito 'said V,second converter, a vsingle .bank of piezocrystals for controlling both said local ,oscillators ⁇ a nrst-multi-pointswitch for selectively connectfing Cany4 one ⁇ of said I.crystals to the firstimentioned local oscillator, and a second multi-pointfswtch forvconnecting anyzone of said crystals to the second local oscillator and thereby to maintain
- a radio receiver comprising a tunable input radio frequency amplifier, a first frequency converter connected to the output of said amplifier, a band-pass filter connected to the output of said converter for selecting one side band of the converted frequencies, a second frequency -converter connected to the output of said filter to produce an intermediate frequency, an amplifier and detector for said intermediate frequency; a rst local beating oscillator for said first converter and having a tuning element for tuning the said rst oscillator over a predetermined frequency range of frequencies, another local beating oscillator for said second converter having a tuning device for tuning said second oscillator over the same frequency range as the rst oscillator, a frequency multiplier connected between the first local oscillator and the rst converter, a bank of piezoelectric crystals common to both said oscillators each crystal being allotted to a corresponding one of the carrier frequency channels to be received and covering the same frequency range as said oscillators, a multi-point switch having a movable contact arm and stationary contacts each connected to a
- a radio receiver of the double superheterodyne type comprising an input radio frequency amplifier tunable to group and unit frequencies, a first frequency converter connected to the output of said amplifier, a second frequency converter connected to the output of said first converter to produce a final intermediate frequency, a rst local beating oscillator for the first converter, a second local beating oscillator for the second converter, each of said oscillators having frequency-adjusting means for maintaining said intermediate frequency constant over the entire tuning range of said amplifier, means to multiply the frequency of the oscillations from the first local oscillator before applying them to the rst converter, each of said local oscillators 'being of the piezo crystal-controlled type, a bank of piezoelectric crystals connectable to said oscillators for controlling their respective frequencies, the number of crystals in the bank being equal in number to the number of group frequencies to which the said radio frequency amplifier can be tuned, and a pair of multi-point switches one for each of said oscillators for connecting said crystals in different combinations respectively to said oscillators to
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- Superheterodyne Receivers (AREA)
Description
Nov. 15, 1949 F. MDM/ls CHANNELIZED H:IGH-FREQUENCYv SIGNAL RECEIVING SYSTEMS Filed Nov. 21, 1945 mSSk uk@ zNVE/vrozz. FPA/wf /7 QQ ws BY 3 and efciently received carrier frequencies over the range 108 to 118 megacycles.
The amplified Waves from device 2 are applied to a mixer or frequency converter stage il which Y may take the form of any Well-known frequency converter tube such as conventionally used in the frequency conversion stage of a superheterodyne radio receiver. There is also applied to the mixer 4 a local oscillator beat frequency which is generated by the local oscillator 5 which may be of any Well-known electron tube type having an adjustable frequency-determining or tuning element which is schematically illustrated b-y the arrow E. Oscillator 5 is of the type which is stabilized at its selected or tuned frequency by means of a particular one of the series of piezo crystals l to I6. The frequencies from oscillator 5 are multiplied in frequency by any Well-known frequency multiplier Il whereby the actual beat frequency applied to mixer 4 is ten times the frequency of the selected crystal. For example, crystal 'I may have a frequency of 9.5 megacycles and each of the succeeding crystals may have a frequency which is 0.1 megacycle greater than the 4preceding crystal. The respective crystal frequencies are indicated in the drawing by the frequencies adjacent each of their respective conductors which are connected to corresponding stationary contacts in the contact bank of a rotary switch I8. The rotatable brush I of this switch can therefore select any desired one of the crystals for connection to the oscillator 5.
As indicated by the dotted line connections, the tuning elements 3, 6, and the brush I9 are `ganged together to a common tuning indicator dial 20 so that tuning of the amplifier 2 to any .desired frequency channel in the band 108 to 118 megacycles, automatically connects the proper .crystal in circuit and automatically tunes the -oscillator to the corresponding channel fre- .quency In the drawing the numerals above the respective blocks, represent a particular selected spot frequency, While the numerals below the respective blocks indicate the respective frequency bands. The gauging of the various elements 3, 5 and I9 is such that the resultant beat frequency in the output of mixer 4 is confined to the band 13 to 13.9 megacycles, it being understood that the filter 2l is of the band pass type to cover the 13 to 13.9 megacycle band. The device 2| may be of any Well-known band pass type and may, if desired, include a corresponding band amplifier.
The signals from device 2! are then applied to another mixer or frequency converter 22 Which in turn is supplied With a local beat frequency from the local oscillator 23. Oscillator 23 is provided With a tuning element 2li so that the oscillator can be tuned over the band 9.5 to 10.4 megacycles as is the oscillator 5 already described. The oscillator 23 is of the crystal stabilized type and is connected to the rotary brush 25 of a switch whose stationary bank contacts are multipled to the respective crystals l to I0. The brush 25 and the tuning element 2d are ganged through a suitable gearing or ratio coupling 25 to the dial 20 so that for each tenth of a turn of the dial 20 the brush 25 makes a complete revolution, it being understood that the previously described brush i9 is ganged to the dial 29 so that brush I9 makes a complete revolution for each complete revolution of dial 20. In other Words, the received band of 108 to 118 megacycles may be considered as divided into 100 separate frequency channels, each channel having a Width of approximately 0.1 megacycle. When the tuning element 3 is tuned to any channel between 108 and 108.9 megacycles the brush I9 is in engagement with stationary contact 2. When the tuning element 3 is tuned to the band 109 to 109.9, brush I9 is advanced into engagement with the next stationary Contact 28, and so on for the remaining frequency channels. However the brush 25 is geared in a ten to one ratio to the brush I9. Thus, When the element 3i is tuned to the 108 megacycle frequency, brush 25 is in engagement with stationary contact 29. As the device 3 is tuned over the band 108 to 108.9 megacycles, the brush 25 makes ten successive steps corresponding to each of the ten frequency channels in the 108 to the 108.9 band. With this ganging arrangement, the beat frequency in the output of mixer 22 is1confined to a particular intermediate frequency, and in the system as illustrated this intermediate frequency is 3.5 megacycles which is applied to a corresponding I. F. amplifier 30 whose output is applied to any Well-known detector 3l for detecting the signal modulations in the amplified I. F. carrier. These signal modulations can then be applied to any Well-known audio frequency amplifier 32 whose output is connected to any suitable signal reproducer 33.
In the particular example illustrated in the drawing, it is assumed that the system is to receive on the channel 109.9 megacycles. Under these conditions the dial 20 is turned so that the element 3 tunes the amplifier 2 to 109.9 megacycles. Since this desired channel is in the second decade, the turning of dial 20 automatically advances the brush I9 to the second stationary contact 28 thereby connecting crystal B in circuit and causing a local beat frequency of 96 megacycles to be applied to mixer il. The difference frequency of 13.9 megacycles is then amplified in the band pass amplifier 2l and is applied to the mixer 22. At the same time since the desired channel is in the ninth subdivision of the second decade frequency range, the adjustment of dial 2i? as above described causes brush 25 to be advanced to the ninth stationary contact 34, thus connecting the 10.4 megacycle crystal I6 in circuit with oscillator 23. There is thus producedr an intermediate beat frequency of 3.5 megacycles Which is suitably amplified in the amplifier 39.
If desired, the brush 25 and the tuning element '2li of oscillator 23 can be independently adjusted so that they are not ganged to the dial 26. Under that condition there would be provided two tuning knobs or dials, namely the dial 20 and another dial which controls the brush 25 and the oscillator tuning element 24. The dial 2B would then be calibrated in one megacycle steps, and the dial for oscillator 23 Would be calibrated in ten steps from 0.1 megacycle to 0.9 megacycle.
While one particular frequency conversion system and While one particular band of frequency channels have been described, it will be understood that changes and modifications may be made therein without departing from the spirit and scope of the invention.
What is claimed is:
1. A radio receiving system of the type adapted to receive on a plurality of selectable input carrier frequencies the frequencies being divisible into X groups and with Y frequencies in each group, a plurality of successive frequency converter stages of the superheterodyne type for the received carrier frequencies, means selectively to vsupplyfthe `succeeding `stage 'with-any desired one of Y beating oscillations of differentfreqnencies from those supplied to 4the iirst stage, a bank of piezo crystals the number of Acrystals being equal to XLand each crystal Lbeing capable of simulv`taneously fstabilizing the Ilocal 'beating oscilla- "tionsf'of both said stages, a lplurality of switches reach switchhaving asset lof bank contacts ,and -a selectively movable brush, said crystalsbeing connected in multiple to the bank contacts of each switch, and said brushes being individually connected to the corresponding local oscillator generator for each of said stages, to enable a single crystal to simultaneously stabilize both said stages and to enable any desired combination of crystals to be connected to said stages to simultaneously stabilize their respective frequencies.
2. A radio receiver of the double superheterodyne type to receive on any one of a plurality of selectable input frequencies and comprising a pair of successive frequency conversion stages, means including an oscillator generator to supply one stage with local beating oscillations, means including another oscillator generator to supply the preceding stage with local beating oscillations whose frequencies are multiples of the first-mentioned beating oscillations, a plurality of piezo crystals, each crystal being connectable simultaneously to both said generators to stabilize their respective frequencies, a multi-point switch for connecting a selected one of said crystals to the first-mentioned oscillator generator, another multi-point switch for connecting said selected crystal or any other one of said crystals to the second-mentioned oscillator generator and thereby maintaining the converted frequency from said one stage uniform, regardless of the frequency to which the receiver is tuned.
3. A radio receiver according to claim 2 in which each of said switches includes a set of fixed contacts one for each crystal, the fixed contacts in both switches being connected in multiple to said crystals for connecting them in different combinations to said oscillator generators.
4. A radio receiving system of the type adapted to receive a plurality of selectable input carrier frequencies, a plurality of successive frequency converter stages of the superheterodyne type for the received carrier frequencies, means including an oscillator-generator to supply one stage with local beating oscillations, means including another oscillator-generator to supply a succeeding stage with local beating oscillations of a frequency different from the first-mentioned beating oscillations, means to tune each oscillator to a plurality of beating frequencies, a single bank of piezoelectric crystals common to both said oscillators, and switching means for connecting any one of said crystals to both oscillators to control both oscillators simultaneously, and also for connecting said crystals in different combinations respectively to said oscillators and thereby to maintain the converted frequency of said succeeding stage constant, for any one of said selected input frequencies.
5. A radio receiver of the double superheterodyne type having an input radio frequency i crystal-.controlled.tunable oscillator which-is con- `vnected to said-first converterthroughaifrequency multiplier, va .second frequency converter which is z-ccnnected to the output of said :first-converter to produce a'finaliintermediate frequency, a secf-ond source oflocal beating oscillations for :said second converter .and including another :tunable crystal-controlled oscillator which is connectedito 'said V,second converter, a vsingle .bank of piezocrystals for controlling both said local ,oscillators `a nrst-multi-pointswitch for selectively connectfing Cany4 one `of said I.crystals to the firstimentioned local oscillator, and a second multi-pointfswtch forvconnecting anyzone of said crystals to the second local oscillator and thereby to maintain the intermediate frequency from said second converter constant, over the entire tuning range of said amplifier.
6. A radio receiver, comprising a tunable input radio frequency amplifier, a first frequency converter connected to the output of said amplifier, a band-pass filter connected to the output of said converter for selecting one side band of the converted frequencies, a second frequency -converter connected to the output of said filter to produce an intermediate frequency, an amplifier and detector for said intermediate frequency; a rst local beating oscillator for said first converter and having a tuning element for tuning the said rst oscillator over a predetermined frequency range of frequencies, another local beating oscillator for said second converter having a tuning device for tuning said second oscillator over the same frequency range as the rst oscillator, a frequency multiplier connected between the first local oscillator and the rst converter, a bank of piezoelectric crystals common to both said oscillators each crystal being allotted to a corresponding one of the carrier frequency channels to be received and covering the same frequency range as said oscillators, a multi-point switch having a movable contact arm and stationary contacts each connected to a respective crystal for selectively connecting any one of said crystals to the rst local oscillator, another multi-point switch having a movable contact arm and stationary contacts each connected to a respective crystal for selectively and simultaneously connecting said selected crystal or any other one of said crystals to the second local oscillator, and means connecting the movable contact arm of the first switch to the tuning element of said rst oscillator and to the tuning element of said radio frequency amplifier to tune said amplifier to any desired frequency channel and also for automatically connecting the proper crystal in circuit with the first local oscillator and kthereby maintaining the frequency from said intermediate frequency constant, for every carrier frequency channel to be received.
'7. A radio receiver of the double superheterodyne type, comprising an input radio frequency amplifier tunable to group and unit frequencies, a first frequency converter connected to the output of said amplifier, a second frequency converter connected to the output of said first converter to produce a final intermediate frequency, a rst local beating oscillator for the first converter, a second local beating oscillator for the second converter, each of said oscillators having frequency-adjusting means for maintaining said intermediate frequency constant over the entire tuning range of said amplifier, means to multiply the frequency of the oscillations from the first local oscillator before applying them to the rst converter, each of said local oscillators 'being of the piezo crystal-controlled type, a bank of piezoelectric crystals connectable to said oscillators for controlling their respective frequencies, the number of crystals in the bank being equal in number to the number of group frequencies to which the said radio frequency amplifier can be tuned, and a pair of multi-point switches one for each of said oscillators for connecting said crystals in different combinations respectively to said oscillators to maintain said intermediate frequency uniform, over the entire tuning range of said amplifier.
FRANK M. DAVIS.
8 REFERENCES CITED The following references are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date 1,753,444 Ohl Apr. 8, 1930 1,753,445 Ohl Apr. 8, 1930 2,235,768 Lock Mar. 18, 1941 10 2,354,148 shaw July 1a, 1944
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US629991A US2487857A (en) | 1945-11-21 | 1945-11-21 | Channelized high-frequency signal receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US629991A US2487857A (en) | 1945-11-21 | 1945-11-21 | Channelized high-frequency signal receiving system |
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| Publication Number | Publication Date |
|---|---|
| US2487857A true US2487857A (en) | 1949-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| US629991A Expired - Lifetime US2487857A (en) | 1945-11-21 | 1945-11-21 | Channelized high-frequency signal receiving system |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2567860A (en) * | 1946-11-18 | 1951-09-11 | Arthur A Glass | Tuning mechanism for superheterodyne radio receivers of the steptuned type |
| US2646512A (en) * | 1941-09-30 | 1953-07-21 | Univ Leland Stanford Junior | Oscillation generator |
| US2654832A (en) * | 1948-03-26 | 1953-10-06 | Rca Corp | Highly selective and stable wide range frequency converting circuits |
| US2665377A (en) * | 1951-12-20 | 1954-01-05 | Sarkes Tarzian | Universal tuning system for television receivers |
| US2666140A (en) * | 1949-11-16 | 1954-01-12 | Wallace Marcel | Beat frequency oscillator |
| US2692943A (en) * | 1950-12-16 | 1954-10-26 | Avco Mfg Corp | Decituned transceiver |
| US2766375A (en) * | 1951-05-10 | 1956-10-09 | Collins Radio Co | Direct reading decade frequency tuning system for double conversion superheterodyne receiver |
| US2772351A (en) * | 1952-03-14 | 1956-11-27 | Standard Coil Prod Co Inc | Plural band television receiver tuner with channel indicator knob |
| US2772353A (en) * | 1952-02-27 | 1956-11-27 | Standard Coil Prod Co Inc | V. h. f.-u. h. f. tuners |
| US2785297A (en) * | 1952-03-14 | 1957-03-12 | Standard Coil Prod Co Inc | Receiver tunable over the very high and ultrahigh frequency television bands |
| US2790079A (en) * | 1955-08-18 | 1957-04-23 | Itt | Multi-channel radio equipment |
| US2843740A (en) * | 1954-12-14 | 1958-07-15 | Philips Corp | High-frequency multi-channel generator |
| US2848616A (en) * | 1956-07-16 | 1958-08-19 | Collins Radio Co | Stepped frequency generating means |
| US2859343A (en) * | 1954-09-20 | 1958-11-04 | Daystrom Inc | Method and apparatus for testing electronic circuits and components |
| US2864945A (en) * | 1954-12-14 | 1958-12-16 | Standard Coil Prod Co Inc | Crystal controlled television tuner |
| US2881321A (en) * | 1957-08-30 | 1959-04-07 | Walter J Dauksher | Variable frequency crystal controlled oscillator |
| US2902596A (en) * | 1953-06-11 | 1959-09-01 | Bendix Aviat Corp | Transceiver for multi-channel radio communication systems |
| US2973483A (en) * | 1959-01-27 | 1961-02-28 | Jr Robert R Stone | Frequency synthesizer employing carrier and sideband selection |
| US2988710A (en) * | 1958-12-19 | 1961-06-13 | Gen Electric | Digital frequency generator |
| US3054057A (en) * | 1960-07-13 | 1962-09-11 | Gen Dynamics Corp | Digitally tuned transmitter-receiver |
| US3233192A (en) * | 1963-09-20 | 1966-02-01 | Nat Aeronautical Corp | Independent multi-overtone operation of electro-mechanically frequency controlled oscillators |
| US3327222A (en) * | 1963-10-14 | 1967-06-20 | King Radio Corp | High frequency radio receiver |
| US3624540A (en) * | 1967-10-30 | 1971-11-30 | Cit Alcatel | Frequency synthesizer |
| US3883808A (en) * | 1969-07-29 | 1975-05-13 | Joseph E Boone | Radio |
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|---|---|---|---|---|
| US1753445A (en) * | 1926-10-08 | 1930-04-08 | American Telephone & Telegraph | Signaling system |
| US1753444A (en) * | 1926-10-08 | 1930-04-08 | American Telephone & Telegraph | Signaling system |
| US2235768A (en) * | 1939-01-31 | 1941-03-18 | Rca Corp | Radio remote control |
| US2354148A (en) * | 1942-09-15 | 1944-07-18 | Rca Corp | Push-button tuner for radio receivers |
-
1945
- 1945-11-21 US US629991A patent/US2487857A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1753445A (en) * | 1926-10-08 | 1930-04-08 | American Telephone & Telegraph | Signaling system |
| US1753444A (en) * | 1926-10-08 | 1930-04-08 | American Telephone & Telegraph | Signaling system |
| US2235768A (en) * | 1939-01-31 | 1941-03-18 | Rca Corp | Radio remote control |
| US2354148A (en) * | 1942-09-15 | 1944-07-18 | Rca Corp | Push-button tuner for radio receivers |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2646512A (en) * | 1941-09-30 | 1953-07-21 | Univ Leland Stanford Junior | Oscillation generator |
| US2567860A (en) * | 1946-11-18 | 1951-09-11 | Arthur A Glass | Tuning mechanism for superheterodyne radio receivers of the steptuned type |
| US2654832A (en) * | 1948-03-26 | 1953-10-06 | Rca Corp | Highly selective and stable wide range frequency converting circuits |
| US2666140A (en) * | 1949-11-16 | 1954-01-12 | Wallace Marcel | Beat frequency oscillator |
| US2692943A (en) * | 1950-12-16 | 1954-10-26 | Avco Mfg Corp | Decituned transceiver |
| US2766375A (en) * | 1951-05-10 | 1956-10-09 | Collins Radio Co | Direct reading decade frequency tuning system for double conversion superheterodyne receiver |
| US2665377A (en) * | 1951-12-20 | 1954-01-05 | Sarkes Tarzian | Universal tuning system for television receivers |
| US2772353A (en) * | 1952-02-27 | 1956-11-27 | Standard Coil Prod Co Inc | V. h. f.-u. h. f. tuners |
| US2772351A (en) * | 1952-03-14 | 1956-11-27 | Standard Coil Prod Co Inc | Plural band television receiver tuner with channel indicator knob |
| US2785297A (en) * | 1952-03-14 | 1957-03-12 | Standard Coil Prod Co Inc | Receiver tunable over the very high and ultrahigh frequency television bands |
| US2902596A (en) * | 1953-06-11 | 1959-09-01 | Bendix Aviat Corp | Transceiver for multi-channel radio communication systems |
| US2859343A (en) * | 1954-09-20 | 1958-11-04 | Daystrom Inc | Method and apparatus for testing electronic circuits and components |
| US2843740A (en) * | 1954-12-14 | 1958-07-15 | Philips Corp | High-frequency multi-channel generator |
| US2864945A (en) * | 1954-12-14 | 1958-12-16 | Standard Coil Prod Co Inc | Crystal controlled television tuner |
| US2790079A (en) * | 1955-08-18 | 1957-04-23 | Itt | Multi-channel radio equipment |
| US2848616A (en) * | 1956-07-16 | 1958-08-19 | Collins Radio Co | Stepped frequency generating means |
| US2881321A (en) * | 1957-08-30 | 1959-04-07 | Walter J Dauksher | Variable frequency crystal controlled oscillator |
| US2988710A (en) * | 1958-12-19 | 1961-06-13 | Gen Electric | Digital frequency generator |
| US2973483A (en) * | 1959-01-27 | 1961-02-28 | Jr Robert R Stone | Frequency synthesizer employing carrier and sideband selection |
| US3054057A (en) * | 1960-07-13 | 1962-09-11 | Gen Dynamics Corp | Digitally tuned transmitter-receiver |
| US3233192A (en) * | 1963-09-20 | 1966-02-01 | Nat Aeronautical Corp | Independent multi-overtone operation of electro-mechanically frequency controlled oscillators |
| US3327222A (en) * | 1963-10-14 | 1967-06-20 | King Radio Corp | High frequency radio receiver |
| US3624540A (en) * | 1967-10-30 | 1971-11-30 | Cit Alcatel | Frequency synthesizer |
| US3883808A (en) * | 1969-07-29 | 1975-05-13 | Joseph E Boone | Radio |
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