GB737613A - Improvements in the automatic frequency control of oscillators - Google Patents
Improvements in the automatic frequency control of oscillatorsInfo
- Publication number
- GB737613A GB737613A GB16786/53A GB1678653A GB737613A GB 737613 A GB737613 A GB 737613A GB 16786/53 A GB16786/53 A GB 16786/53A GB 1678653 A GB1678653 A GB 1678653A GB 737613 A GB737613 A GB 737613A
- Authority
- GB
- United Kingdom
- Prior art keywords
- inductance
- circuit
- frequency
- oscillator
- variable
- 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
- 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
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
737,613. Automatic frequency control systems. SOC. FRANCAISE RADIO-ELECTRIQUE. June 17, 1953 [June 17, 1952], No. 16786/63. Class 38 (4). [Also in Group XL (c)] An oscillator tunable over a relatively wide band, e.g. as the local oscillator in a single sideband receiver, has its frequency determining circuit inductively coupled to a second circuit comprising a capacitor and inductance variable under the control of a discriminator responsive to any deviation in frequency of the oscillator. The first and second circuits may be coupled by mutual inductance or, Fig. 3, by an inductance L4 common to the first circuit L3, C1, L4 and second circuit L4, C2, L2<SP>11</SP>. This Figure shows the arrangement applied to a tuned anode oscillator with frequency tuning variable capacitor C1 and with variable frequency correcting inductance L2" and with the inductances L3, L4 coupled to the grid circuit by mutual inductances M1, M2 of opposite sign, to ensure a constant amplitude as the tuning is varied. It is shown mathematically that if w o =1/#5.w, where w o and w are the frequencies of the secondary and primary circuits per se, then ##/#L2, the ratio of the change in frequency of the primary circuit to the change in inductance of the secondary circuit is a minimum value with respect to w, i.e. is nearly constant. A fixed value for w o is given which makes this relation hold approximately over the frequency range between the minimum and maximum values of the tuned frequency of the primary circuit and with the value of##/#L2 less than at the extreme limits of the frequency range. The secondary circuit inductance L2" may be variable by an iron core displaceable under motor control, or by a pair of non- magnetic metal vanes on a common spindle rotated to overlap on each side the inductance, or by a single vane rotated to a position between two inductance portions connected in series.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR737613X | 1952-06-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB737613A true GB737613A (en) | 1955-09-28 |
Family
ID=9131847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16786/53A Expired GB737613A (en) | 1952-06-17 | 1953-06-17 | Improvements in the automatic frequency control of oscillators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB737613A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1201426B (en) * | 1956-07-04 | 1965-09-23 | Philips Nv | Device for tuning a stage which can be tuned continuously over a wide frequency range |
-
1953
- 1953-06-17 GB GB16786/53A patent/GB737613A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1201426B (en) * | 1956-07-04 | 1965-09-23 | Philips Nv | Device for tuning a stage which can be tuned continuously over a wide frequency range |
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