GB633071A - Improvements in multi-frequency generating and selecting systems - Google Patents
Improvements in multi-frequency generating and selecting systemsInfo
- Publication number
- GB633071A GB633071A GB27060/46A GB2706046A GB633071A GB 633071 A GB633071 A GB 633071A GB 27060/46 A GB27060/46 A GB 27060/46A GB 2706046 A GB2706046 A GB 2706046A GB 633071 A GB633071 A GB 633071A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- output
- range
- filter
- band
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
- H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
- H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
633,071. Valve generating circuits. COLLINS RADIO CO. Sept. 9, 1946, No. 27060. Convention date, Feb. 27. [Class 40 (vi)] A selective multi-frequency producing system for obtaining any one of a large series of closely spaced frequencies each having the stability of a crystal-controlled oscillator, comprises a number of frequency selector channels controlled from a common master oscillator characterised in that each channel has a number of frequency convertors each fed by an adjustable local oscillator and by oscillations controlled from the master source to produce a selected stable frequency at the output of each channel, these outputs being combined in a common mixer circuit from which a particular output frequency is selected. The Figure shows such a system for use in producing in successive 10 kc/s. steps any one of,2000 desired frequencies in the range from 20 to 40 mc/s., each having the same stability as the crystal controlled oscillator 10. The output from the 100 kc/s. crystal oscillator 10 is halved in frequency in divider 13 and harmonics of the 50 kc/s. output are produced in the distorting valve 21 and passed through a band-pass filter 22 which passes any desired narrow band of frequencies in the range 6.7-8.7 mc/s. The output of filter 22 is mixed with the output of a variable local oscillator 24 which is set to any frequency within the range 3-4 mc/s. and which has an output circuit selectively amplifying the second harmonic of its fundamental frequency the " difference " frequency of 700 kc/s. which is set by the ganging of oscillator 24 and filter 22 is amplified in the I.F. amplifier 27. The output of this amplifier is mixed in mixer 28 with the output of a further band-pass filter 29 which selects a narrow band of frequencies within the range 6-8 mc/s. to give the " sum " frequency which is selected by a further tuned band-pass filter 31 which passes a narrow band of frequencies within the range 6.7-8.7 mc/s. The output frequency of this filter, the stability of which depends only upon that of the master oscillator 10, is multiplied ten times in stage 33 and passed through an adjustable band-pass filter 34 which covers the range of 67-87 mc/s. The tuning controls of filters 22, 29, 31, 34 and of oscillator 24 are ganged and controlled by one knob 36 which may be calibrated to cover the range of 67-86.5 mc/s. in 500 kc/s. steps. The selector channel " B " which is controlled by the 10 kc/s. output of divider 14 is substantially the same as channel " A " as far as filter 31 except that it is arranged to select in 50 successive steps of 10 kc/s. spacing any frequency in the range of 3-3.5 mc/s. For use in a carrier generating system the switches 50, 51 are set in the position shown, the crystal oscillator output frequency after successive multiplication and filtering in the stages 15 to 19 is passed through the 50 mc/s. filter 52 and mixed in stage 53 with the output of channel B, the " difference " frequency being selected by the band-pass filter 54 which covers the range of 46.5-47 mc/s. The output of filter 54 is then mixed in stage 55 with the output of channel " A " and the " difference " frequency selected by filter 56 to give any frequency in successive steps of 10 kc/s. within the range of 20-40 mc/s. When the switches 50, 51 are moved to the lower position a 55 mc/s. signal is selected by filter 58 and the band-pass filter 59 adjusted to pass a band of frequencies in the range 51.5-52 mc/s., thus enabling any frequency in successive 10 kc/s. steps within the range 15-35 mc/s. to be selected at the output 57.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US650666A US2445664A (en) | 1946-02-27 | 1946-02-27 | Multifrequency generating and selecting system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB633071A true GB633071A (en) | 1949-12-12 |
Family
ID=24609795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27060/46A Expired GB633071A (en) | 1946-02-27 | 1946-09-09 | Improvements in multi-frequency generating and selecting systems |
Country Status (2)
Country | Link |
---|---|
US (1) | US2445664A (en) |
GB (1) | GB633071A (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2572024A (en) * | 1948-03-26 | 1951-10-23 | Sylvester J Haefner | Device for generating multiple signals of different frequencies |
US2636117A (en) * | 1949-02-21 | 1953-04-21 | Edgar E Cox | Radio receiving system |
US2679006A (en) * | 1949-05-16 | 1954-05-18 | Collins Radio Co | Frequency selector |
US2760074A (en) * | 1951-12-20 | 1956-08-21 | Itt | Frequency generator |
US2879387A (en) * | 1953-11-25 | 1959-03-24 | Leonard R Kahn | Multi-channel phase locked tone converter |
US2773187A (en) * | 1954-02-01 | 1956-12-04 | Hoffman Electronics Corp | Crystal oscillator circuits or the like |
US2892944A (en) * | 1957-04-24 | 1959-06-30 | Panoramic Radio Products Inc | Signal generator |
US3694561A (en) * | 1970-04-15 | 1972-09-26 | Chicago Musical Instr Co | Animation circuit for a musical instrument |
USRE31295E (en) * | 1971-03-01 | 1983-06-28 | Bell Telephone Laboratories, Incorporated | Carrier supply for frequency division multiplexed systems |
US3733438A (en) * | 1971-03-01 | 1973-05-15 | Bell Telephone Labor Inc | Carrier supply for frequency division multiplexed systems |
GB1337166A (en) * | 1971-10-28 | 1973-11-14 | Marconi Co Ltd | Frequency generators |
US4255710A (en) * | 1978-05-19 | 1981-03-10 | Weber Harold J | Plural search frequency directional metal detector apparatus having enhanced sensitivity |
CN102707106B (en) * | 2012-05-18 | 2014-08-20 | 宁波伟吉电力科技有限公司 | Electric power subharmonic digital signal source |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1854985A (en) * | 1929-01-10 | 1932-04-19 | Sr Carl Doerr | Electric lighter for cigars, cigarettes and the like |
GB418707A (en) * | 1932-12-22 | 1934-10-30 | Siemens Ag | Multi-channel carrier transmission system designed more particularly for cable circuits |
US2247544A (en) * | 1938-11-29 | 1941-07-01 | Harold C Daily | Apparatus and process for generating sinusoidal currents |
US2369268A (en) * | 1942-05-27 | 1945-02-13 | Rca Corp | Radio repeater |
US2406932A (en) * | 1942-06-16 | 1946-09-03 | Rca Corp | Wave conversion |
US2407212A (en) * | 1942-06-16 | 1946-09-03 | Rca Corp | Radio relaying |
US2340364A (en) * | 1942-08-22 | 1944-02-01 | Rca Corp | Audio transmission circuit |
US2383005A (en) * | 1942-11-06 | 1945-08-21 | Jr William S Marks | Frequency control system |
-
1946
- 1946-02-27 US US650666A patent/US2445664A/en not_active Expired - Lifetime
- 1946-09-09 GB GB27060/46A patent/GB633071A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2445664A (en) | 1948-07-20 |
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