JPS57196630A - Automatic tuning device for antenna tuner - Google Patents

Automatic tuning device for antenna tuner

Info

Publication number
JPS57196630A
JPS57196630A JP8150281A JP8150281A JPS57196630A JP S57196630 A JPS57196630 A JP S57196630A JP 8150281 A JP8150281 A JP 8150281A JP 8150281 A JP8150281 A JP 8150281A JP S57196630 A JPS57196630 A JP S57196630A
Authority
JP
Japan
Prior art keywords
circuit
standing wave
wave ratio
antenna tuner
motor
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
Application number
JP8150281A
Other languages
Japanese (ja)
Inventor
Masaki Yanagihara
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.)
TRIO KENWOOD CORP
Trio KK
Kenwood KK
Original Assignee
TRIO KENWOOD CORP
Trio KK
Kenwood KK
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 TRIO KENWOOD CORP, Trio KK, Kenwood KK filed Critical TRIO KENWOOD CORP
Priority to JP8150281A priority Critical patent/JPS57196630A/en
Publication of JPS57196630A publication Critical patent/JPS57196630A/en
Pending legal-status Critical Current

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
    • H03J7/16—Automatic frequency control where the frequency control is accomplished by mechanical means, e.g. by a motor

Landscapes

  • Transmitters (AREA)

Abstract

PURPOSE:To prevent the oscillation due to the inertia of a motor, by detecting a standing wave ratio between an antenna tuner and a transmitter and applying a voltage corresponding to the standing wave ratio as a power supply voltage for a motor for matching element control. CONSTITUTION:A standing wave ratio detecting circuit 8 is provided on a connecting line between a transmitter 1 and an antenna tuner 3 matching an antenna 2, and an output voltage of the circuit 8 is applied to a minimum point detecting circuit 22 and a pulse width modulating circuit 26. An output signal of a pulse width modulation circuit is applied to a driving circuit 29 via a motor switching circuit 27, motors 14 and 15 are driven to control the value of matching elements 6 and 7 of the antenna tuner 3. A minimum point detecting circuit 22 switches a switching circuit 27 every time the minimum point of the standing wave ratio is detected to select a drive motor and the direction of rotation. Since a pulse width modulation circuit 26 outputs a signal with a width corresponding to the standing wave ratio, the voltage applied to the motors 14 and 15 is decreased with the reduction in the standing wave ratio and the motors 14 and 15 are finally stopped.
JP8150281A 1981-05-28 1981-05-28 Automatic tuning device for antenna tuner Pending JPS57196630A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8150281A JPS57196630A (en) 1981-05-28 1981-05-28 Automatic tuning device for antenna tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8150281A JPS57196630A (en) 1981-05-28 1981-05-28 Automatic tuning device for antenna tuner

Publications (1)

Publication Number Publication Date
JPS57196630A true JPS57196630A (en) 1982-12-02

Family

ID=13748132

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8150281A Pending JPS57196630A (en) 1981-05-28 1981-05-28 Automatic tuning device for antenna tuner

Country Status (1)

Country Link
JP (1) JPS57196630A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117878567A (en) * 2023-12-14 2024-04-12 中国人民解放军国防科技大学 A portable shortwave weather fax antenna and its use method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117878567A (en) * 2023-12-14 2024-04-12 中国人民解放军国防科技大学 A portable shortwave weather fax antenna and its use method

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