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 PDFInfo
- 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
Links
Landscapes
- 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>
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) |
-
1990
- 1990-03-29 FI FI901579A patent/FI86014C/en not_active IP Right Cessation
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 |