JPS54160107A - Afc circuit of receiver - Google Patents
Afc circuit of receiverInfo
- Publication number
- JPS54160107A JPS54160107A JP6951078A JP6951078A JPS54160107A JP S54160107 A JPS54160107 A JP S54160107A JP 6951078 A JP6951078 A JP 6951078A JP 6951078 A JP6951078 A JP 6951078A JP S54160107 A JPS54160107 A JP S54160107A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency
- tuning
- receiver
- intermediate frequency
- 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.)
- Pending
Links
Classifications
-
- 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
- H03J7/08—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 using varactors, i.e. voltage variable reactive diodes
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To ensure the accurate reception of the reception frequency with perfect prevention of the tuning drift for the receiver incorporating the radio watch to receive the frequency and others by detecting the tuning drift through the frequency discrminating circuit and then securing the automatic correction for the local oscillation frequency. CONSTITUTION:The AM receiver contains tuning circuit 1, mixer circuit 2, detection circuit 4, local oscillator circuit 6, frequency discriminator circuit 7 and others. In such receiver, variable capacity diode 8 of circuit 6 is controlled by the output of circuit 7, and thus the oscillation frequency is varied to be supplied to circuit 2. Then tuning circuit T1 which is a little higher than the intermediate frequency of intermediate frequency amplifier circuit 3 and tuning circuit T2 a little lower than the intermediate frequency plus diode D1 and D2 forming each detection circuit are provided to circuit 7. And the output of circuit 7 is set identical to the variation amount of the tuning frequency caused by the temperature change of circuit 3, thus controlling the oscillation frequency of circuit 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6951078A JPS54160107A (en) | 1978-06-09 | 1978-06-09 | Afc circuit of receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6951078A JPS54160107A (en) | 1978-06-09 | 1978-06-09 | Afc circuit of receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54160107A true JPS54160107A (en) | 1979-12-18 |
Family
ID=13404802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6951078A Pending JPS54160107A (en) | 1978-06-09 | 1978-06-09 | Afc circuit of receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54160107A (en) |
-
1978
- 1978-06-09 JP JP6951078A patent/JPS54160107A/en active Pending
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