JPS61146028U - - Google Patents
Info
- Publication number
- JPS61146028U JPS61146028U JP2815985U JP2815985U JPS61146028U JP S61146028 U JPS61146028 U JP S61146028U JP 2815985 U JP2815985 U JP 2815985U JP 2815985 U JP2815985 U JP 2815985U JP S61146028 U JPS61146028 U JP S61146028U
- Authority
- JP
- Japan
- Prior art keywords
- band
- fixed capacitor
- correction
- switching
- low frequencies
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 2
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は本考案に係る広帯域用チユーナのブロ
ツク図、第２図は第１図の増幅段と混合段に用い
た３バンド同調回路図、第３図乃至第５図は同じ
く各バンド受信時の高周波等価回路図、第６図は
従来のコンビネーシヨンチユーナブロツク図、及
び第７図は第６図のより具体化した回路構成図で
ある。
２１……入力端子、２２……出力端子、２３…
…ＲＦ入力増幅段、２４……混合段、２５……第
１局部発振段、２６……第２局部発振段、３０…
…３バンド同調回路、３１……可変容量ダイオー
ド（素子）、３２……補正用固定コンデンサ、３
３〜３５……同調コイル、３６〜３９……バンド
切換用スイツチングダイオード（素子）、４０…
…第２の固定コンデンサ、４１〜４５……ハイパ
スコンデンサ、５３……同調端子、５４〜５７…
…ハンドスイツチング端子。
Figure 1 is a block diagram of the broadband tuner according to the present invention, Figure 2 is a 3-band tuning circuit diagram used in the amplification stage and mixing stage of Figure 1, and Figures 3 to 5 are the same when each band is received. 6 is a conventional combination tuner block diagram, and FIG. 7 is a more specific circuit configuration diagram of FIG. 6. 21...Input terminal, 22...Output terminal, 23...
...RF input amplification stage, 24...Mixing stage, 25...First local oscillation stage, 26...Second local oscillation stage, 30...
... 3-band tuning circuit, 31 ... Variable capacitance diode (element), 32 ... Fixed capacitor for correction, 3
3-35...Tuning coil, 36-39...Switching diode (element) for band switching, 40...
...Second fixed capacitor, 41-45...High-pass capacitor, 53...Tuning terminal, 54-57...
...Hand switching terminal.
Claims (1)
むＲＦ入力増幅段と混合段を具備するＶＨＦチユ
ーナにおいて、前記同調回路は可変容量素子、こ
れに直列接続の補正用固定コンデンサ、高域、中
域及び低域用同調コイルを選択的に切り換えるバ
ンド切換手段、及び前記補正用固定コンデンサと
並列接続する第２の固定コンデンサとスイツチン
グ素子の直列回路から成り、このスイツチング素
子を選択バンドに応じてＯＮ―ＯＦＦ動作させて
所望するトラツキング補正用容量を得るようにし
たことを特徴とする広帯域用チユーナ。 In a VHF tuner equipped with an RF input amplification stage and a mixing stage including a three-band tuning circuit for high, middle, and low frequencies, the tuning circuit includes a variable capacitance element, a fixed capacitor for correction connected in series with this, and a high-frequency , a band switching means for selectively switching the tuning coil for middle and low frequencies, and a series circuit of a switching element and a second fixed capacitor connected in parallel with the correction fixed capacitor, which switches the switching element according to the selected band. A broadband tuner characterized in that a desired tracking correction capacity is obtained by ON-OFF operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985028159U JPH04584Y2 (en) | 1985-02-27 | 1985-02-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985028159U JPH04584Y2 (en) | 1985-02-27 | 1985-02-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61146028U true JPS61146028U (en) | 1986-09-09 |
| JPH04584Y2 JPH04584Y2 (en) | 1992-01-09 |
Family
ID=30525784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985028159U Expired JPH04584Y2 (en) | 1985-02-27 | 1985-02-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04584Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4893702U (en) * | 1972-02-15 | 1973-11-09 |
-
1985
- 1985-02-27 JP JP1985028159U patent/JPH04584Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4893702U (en) * | 1972-02-15 | 1973-11-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04584Y2 (en) | 1992-01-09 |
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