JPS6356822U - - Google Patents
Info
- Publication number
- JPS6356822U JPS6356822U JP15037186U JP15037186U JPS6356822U JP S6356822 U JPS6356822 U JP S6356822U JP 15037186 U JP15037186 U JP 15037186U JP 15037186 U JP15037186 U JP 15037186U JP S6356822 U JPS6356822 U JP S6356822U
- Authority
- JP
- Japan
- Prior art keywords
- tuning
- tuning circuit
- frequency
- variable capacitor
- amplifier
- 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 5
- 230000010355 oscillation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案の一実施例を示す回路図、第２
図は第１図の要部の等価回路図、第３図は従来の
回路図である。
ＲＦ……ＲＦアンプ、ＯＳＣ……局部発振器、
ＭＩＸ……ミキサー、ＶＣ１０，ＶＣ１１……バ
リコン、１０，１１……同調回路、Ｓ１０……バ
ンドスイツチ、Ｌ１０〜Ｌ１１……同調コイル、
Ｄ１０，Ｄ１１……ピンダイオード。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
This figure is an equivalent circuit diagram of the main part of FIG. 1, and FIG. 3 is a conventional circuit diagram. RF...RF amplifier, OSC...local oscillator,
MIX...mixer, VC10 , VC11 ...variable capacitor, 10,11...tuning circuit, S10 ...band switch, L10 to L11 ...tuning coil,
D 10 , D 11 ... pin diodes.
Claims (1)
１および第２の同調コイルに並列接続したバリコ
ンからなる同調回路に同調し、同調した周波数を
増幅するＲＦアンプと、このＲＦアンプの受信周
波数に対応して少なくとも直列接続した第１およ
び第２の同調コイルに並列接続したバリコンとか
らなる同調回路により発振周波数を設定する局部
発振器と、この局部発振器の発振周波数および前
記ＲＦアンプの受信周波数とにより中間周波数を
生成するミキサーとを備えたフロントエンドにお
いて、前記ＲＦアンプの同調回路および前記局部
発振器の同調回路は受信帯域を切換える切換手段
により受信帯域を切換えたとき、切換えた受信帯
域により、第１、第２の同調コイルそれにバリコ
ンによる同調かあるいは第２の同調コイルおよび
バリコンによる同調に設定してなることを特徴と
するフロントエンドの同調回路切換装置。 An RF amplifier that is tuned to a tuning circuit consisting of a variable capacitor connected in parallel to first and second tuning coils connected at least in series to a desired reception frequency, and that amplifies the tuned frequency; A local oscillator that sets an oscillation frequency by a tuning circuit consisting of at least first and second tuning coils connected in series and a variable capacitor connected in parallel, and an intermediate frequency that is determined by the oscillation frequency of this local oscillator and the receiving frequency of the RF amplifier. In the front end, the tuning circuit of the RF amplifier and the tuning circuit of the local oscillator, when the reception band is switched by the switching means for switching the reception band, generate the first and second signals according to the switched reception band. A front-end tuning circuit switching device characterized in that the front end tuning circuit is set to be tuned by a second tuning coil and a variable capacitor, or by a second tuning coil and a variable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15037186U JPH0430810Y2 (en) | 1986-09-30 | 1986-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15037186U JPH0430810Y2 (en) | 1986-09-30 | 1986-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6356822U true JPS6356822U (en) | 1988-04-15 |
| JPH0430810Y2 JPH0430810Y2 (en) | 1992-07-24 |
Family
ID=31066453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15037186U Expired JPH0430810Y2 (en) | 1986-09-30 | 1986-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0430810Y2 (en) |
-
1986
- 1986-09-30 JP JP15037186U patent/JPH0430810Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0430810Y2 (en) | 1992-07-24 |