JPH0344940U - - Google Patents
Info
- Publication number
- JPH0344940U JPH0344940U JP10597389U JP10597389U JPH0344940U JP H0344940 U JPH0344940 U JP H0344940U JP 10597389 U JP10597389 U JP 10597389U JP 10597389 U JP10597389 U JP 10597389U JP H0344940 U JPH0344940 U JP H0344940U
- Authority
- JP
- Japan
- Prior art keywords
- synchronous detection
- intermediate frequency
- pll
- frequency
- frequency band
- 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
- 238000001514 detection method Methods 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図は本考案装置の実施例による全体構成の
ブロツク図、第２図は上記装置による同期検波の
動作を説明するための波形のタイムチヤート、第
３図は従来装置の構成を示すブロツク図である。
１１……第１ヘテロダイン検波部、１２……導
波部、１３……第１局部発振器、１５……第１中
間周波アンプ、１６……第２ヘテロダイン検波部
、１７……第２局部発振器、１９……第２中間周
波アンプ、２０……ＦＭ検波器、２１，２２……
ＰＬＬ同期検波部、２３……位相反転器、２５，
２６……表示手段、ＳＷ……スイツチ手段。
Fig. 1 is a block diagram of the overall configuration of an embodiment of the device of the present invention, Fig. 2 is a time chart of waveforms to explain the operation of synchronous detection by the above device, and Fig. 3 is a block diagram showing the configuration of a conventional device. It is. 11... First heterodyne detection section, 12... Waveguide section, 13... First local oscillator, 15... First intermediate frequency amplifier, 16... Second heterodyne detection section, 17... Second local oscillator, 19...Second intermediate frequency amplifier, 20...FM detector, 21, 22...
PLL synchronous detection section, 23...phase inverter, 25,
26... Display means, SW... Switch means.
Claims (1)
振器の発振波とから第１中間周波を得る第１ヘテ
ロダイン検波部と、この第１中間周波と第２局部
発振器の発振波とから第２中間周波を得る第２ヘ
テロダイン検波部と、第２中間周波の位相に基づ
き周波数バンドの識別を行うＰＬＬ同期検波部と
を備えたスーパーヘテロダイン受信機における周
波数バンドの識別装置において、 上記ＰＬＬ同期検波部を２つ設けると共に、そ
れぞれのＰＬＬ同期検波部に上記第２中間周波の
ＦＭ検波出力の非反転信号と反転信号を与え、か
つ、両ＰＬＬ同期検波部の自掃周波信号をスイツ
チ手段により交互に切換えて上記第１局部発振器
に対して与えてＦＭ変調をかけ、それぞれのＰＬ
Ｌ同期検波部のロツク出力に基き受信バンドを識
別表示するようにしたことを特徴とするスーパー
ヘテロダイン受信機における周波数バンドの識別
装置。[Claims for Utility Model Registration] A first heterodyne detection section that obtains a first intermediate frequency from a received wave of a waveguide section and an oscillation wave of a first local oscillator forming a PLL circuit; Frequency band identification in a superheterodyne receiver comprising a second heterodyne detection unit that obtains a second intermediate frequency from an oscillation wave of an oscillator, and a PLL synchronous detection unit that identifies a frequency band based on the phase of the second intermediate frequency. In the apparatus, the two PLL synchronous detection sections are provided, each PLL synchronous detection section is provided with a non-inverted signal and an inverted signal of the FM detection output of the second intermediate frequency, and both PLL synchronous detection sections are self-swept. A frequency signal is alternately switched by a switch means and applied to the first local oscillator to apply FM modulation to each PL.
1. A frequency band identification device in a superheterodyne receiver, characterized in that a reception band is identified and displayed based on a lock output of an L synchronous detection section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10597389U JPH0344940U (en) | 1989-09-08 | 1989-09-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10597389U JPH0344940U (en) | 1989-09-08 | 1989-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0344940U true JPH0344940U (en) | 1991-04-25 |
Family
ID=31654723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10597389U Pending JPH0344940U (en) | 1989-09-08 | 1989-09-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0344940U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999035932A1 (en) * | 1998-01-20 | 1999-07-22 | Kabushiki Kaisha Kanagawa Housei Shoukai | Case for portable telephones |
-
1989
- 1989-09-08 JP JP10597389U patent/JPH0344940U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999035932A1 (en) * | 1998-01-20 | 1999-07-22 | Kabushiki Kaisha Kanagawa Housei Shoukai | Case for portable telephones |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU99101770A (en) | RADIO LINK | |
| JPH0344940U (en) | ||
| JPH0344347U (en) | ||
| JPH0310630U (en) | ||
| JPH0344345U (en) | ||
| JPS6130322Y2 (en) | ||
| JPH0461943U (en) | ||
| JPH0293811U (en) | ||
| JPS6344529U (en) | ||
| JPS63122900U (en) | ||
| JPS62146339U (en) | ||
| JPH01126642U (en) | ||
| JPS58164333A (en) | Monitor device of radio transmitter and receiver for cw | |
| JPS61206333U (en) | ||
| JPS59175182U (en) | Electric field strength measuring device | |
| JPS62164429U (en) | ||
| JPS61127465U (en) | ||
| JPS6421538U (en) | ||
| JPS59149746U (en) | wireless relay device | |
| JPH0467827U (en) | ||
| JPS63152324U (en) | ||
| JPS5625837A (en) | Fm radio receiver | |
| JPS5967047U (en) | receiving device | |
| JPS6197273U (en) | ||
| JPH02100324U (en) |