FI901579A - FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON. - Google Patents

FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON. Download PDF

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Publication number
FI901579A
FI901579A FI901579A FI901579A FI901579A FI 901579 A FI901579 A FI 901579A FI 901579 A FI901579 A FI 901579A FI 901579 A FI901579 A FI 901579A FI 901579 A FI901579 A FI 901579A
Authority
FI
Finland
Prior art keywords
radiotelefon
felaotergivning
daempa
mottagare
foerfarande och
Prior art date
Application number
FI901579A
Other languages
Finnish (fi)
Other versions
FI86014B (en
FI86014C (en
FI901579A0 (en
Inventor
Risto Huusko
Original Assignee
Nokia Mobile Phones 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 Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Priority to FI901579A priority Critical patent/FI86014C/en
Publication of FI901579A0 publication Critical patent/FI901579A0/en
Publication of FI901579A publication Critical patent/FI901579A/en
Publication of FI86014B publication Critical patent/FI86014B/en
Application granted granted Critical
Publication of FI86014C publication Critical patent/FI86014C/en

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  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

If the first medium frequency in a radio telephone receiver is less than the reception bandwidth multiplied by two, a faulty reproduction is generated in a mixer which cannot be filtered out by means of fixed filters in the front part of the receiver. The use of a low medium frequency is made possible, however, according to the invention, so that a voltage-controlled interphase filter 2 is connected between the RF signal wave and the circuit earth before the mixer, which filter is caused to suppress the radio frequency signal in the upper area of the reception band which causes the faulty reproduction. <IMAGE>
FI901579A 1990-03-29 1990-03-29 FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON. FI86014C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI901579A FI86014C (en) 1990-03-29 1990-03-29 FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI901579 1990-03-29
FI901579A FI86014C (en) 1990-03-29 1990-03-29 FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON.

Publications (4)

Publication Number Publication Date
FI901579A0 FI901579A0 (en) 1990-03-29
FI901579A true FI901579A (en) 1991-09-30
FI86014B FI86014B (en) 1992-03-13
FI86014C FI86014C (en) 1992-06-25

Family

ID=8530151

Family Applications (1)

Application Number Title Priority Date Filing Date
FI901579A FI86014C (en) 1990-03-29 1990-03-29 FOERFARANDE OCH KOPPLING FOER ATT DAEMPA FELAOTERGIVNING I EN MOTTAGARE AV EN RADIOTELEFON.

Country Status (1)

Country Link
FI (1) FI86014C (en)

Also Published As

Publication number Publication date
FI86014B (en) 1992-03-13
FI86014C (en) 1992-06-25
FI901579A0 (en) 1990-03-29

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Legal Events

Date Code Title Description
FG Patent granted

Owner name: NOKIA MATKAPUHELIMET OY

MA Patent expired