JPS54158806A - Sensitivity change-over unit - Google Patents

Sensitivity change-over unit

Info

Publication number
JPS54158806A
JPS54158806A JP6815278A JP6815278A JPS54158806A JP S54158806 A JPS54158806 A JP S54158806A JP 6815278 A JP6815278 A JP 6815278A JP 6815278 A JP6815278 A JP 6815278A JP S54158806 A JPS54158806 A JP S54158806A
Authority
JP
Japan
Prior art keywords
diode
sensitivity change
ratio
antenna
over unit
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
JP6815278A
Other languages
Japanese (ja)
Inventor
Mitsuo Hirai
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6815278A priority Critical patent/JPS54158806A/en
Publication of JPS54158806A publication Critical patent/JPS54158806A/en
Pending legal-status Critical Current

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
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To attain the improvement of a SN ratio as well as the simplification of wiring as to the sensitivity change-over unit of a ratio receiver, by reducing the number of shielding wires for connections between a printed substrate and the sensitivity change-over unit provided to the operation board of the receiver by improving the constitutions of an antenna input circuit and a tuner circuit. CONSTITUTION:While antenna 1 is connected to antenna tuner circuit 2 via diode D3, resistance R2 as an impedance element with input impedance greater than that of tuner circuit 2 is connected between the output side of diode D3 and earth. In addition, diode D3 is provided at its input side with sensitivity change-over switch S1 with its one terminal connected to power supply 6 and the circuit consisting of power limiting resistance R1 and diodes D1 and D2 connected in series, and capacitor C1 is connected between resistance R1 and the earth. Then, the switching of sensitivity is done through conducting and cutting-off of diode D3 to eliminate the variance of the terminal process of shielding wires, thereby improving the SN ratio.
JP6815278A 1978-06-05 1978-06-05 Sensitivity change-over unit Pending JPS54158806A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6815278A JPS54158806A (en) 1978-06-05 1978-06-05 Sensitivity change-over unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6815278A JPS54158806A (en) 1978-06-05 1978-06-05 Sensitivity change-over unit

Publications (1)

Publication Number Publication Date
JPS54158806A true JPS54158806A (en) 1979-12-15

Family

ID=13365473

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6815278A Pending JPS54158806A (en) 1978-06-05 1978-06-05 Sensitivity change-over unit

Country Status (1)

Country Link
JP (1) JPS54158806A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02141142U (en) * 1989-04-28 1990-11-27
DE4237824C2 (en) * 1992-11-10 2003-08-28 Bosch Gmbh Robert Supply circuit for an antenna amplifier, especially in vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02141142U (en) * 1989-04-28 1990-11-27
DE4237824C2 (en) * 1992-11-10 2003-08-28 Bosch Gmbh Robert Supply circuit for an antenna amplifier, especially in vehicles

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