CN2400972Y - Control switch for radio-frequency signal of wired TV - Google Patents
Control switch for radio-frequency signal of wired TV Download PDFInfo
- Publication number
- CN2400972Y CN2400972Y CN99220954U CN99220954U CN2400972Y CN 2400972 Y CN2400972 Y CN 2400972Y CN 99220954 U CN99220954 U CN 99220954U CN 99220954 U CN99220954 U CN 99220954U CN 2400972 Y CN2400972 Y CN 2400972Y
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- China
- Prior art keywords
- diode
- capacitor
- cable
- control switch
- wired
- 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.)
- Expired - Fee Related
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Abstract
The utility model provides a control switch for radio-frequency signals of a wired TV, which comprises an inductor L, capacitors C< 1-3 >, diodes D< 1-2 >, and a resistor R, wherein, one end of the capacitor C1 is connected with a radio frequency signal input, and the other end of the capacitor C1 is connected with a control end 1 by the inductor L, and the resistor R and the diode D2 by the diode D1; the other end of the capacitor C1 outputs radio frequency signals by the capacitor C3; the other end of the resistor R is connected to the ground; the other end of the diode D2 is connected with the control end 2 and is connected to the ground by the capacitor C2. The utility model not only can effectively stop the leakage of wired television signals when the power is switched off, but also can jam the wired television signals, achieving the purpose of controlling users to watching wired television in paid.
Description
The utility model provides a kind of cable TV radiofrequency signal control switch, belongs to TV signal control switch field.
Cable TV station offers user's TV signal and watches with compensation, in order to solve manual toll collection trouble and the big problem of workload, often in the middle of catv distributor, splitter or amplifier and user's TV, add a radio frequency control switch, the expense rating of paying according to the user.The technology report of at present existing this aspect, as Chinese patent communique disclosed utility model patent on May 4th, 1997: radio-frequency (RF) switch, the patent No.: 97232861, it is characterized in that: be to constitute by input, output and control end that shell and two crystal diodes and auxiliary circuit link to each other, a crystal diode is series at the AC signal passage, and the another crystal diode connects signalling channel and AC signal ground.Its defective is: for the user who does not pay dues, can only play the effect of decay to user's cable TV signal, can not turn-off especially high channel fully; If adopt the current potential of control end frequently to change method user's cable TV signal generation is disturbed,, can be produced other neighboring user and disturb, just can watch cable TV so such scheme can not effectively be controlled subscriber payment because reverse isolation is poor.
The purpose of this utility model provides a kind of according to the on-off of subscriber payment situation control user cable TV signal, effectively control the cable TV radiofrequency signal control switch of the paid rating of user.
The purpose of this utility model is achieved in that
Comprise inductance L, capacitor C
1～3Diode D
1～2 and resistance R, wherein capacitor C
1Termination radiofrequency signal input, the other end meets inductance L and diode D respectively
1, diode D
1Other end connecting resistance R and respectively through capacitor C
3The output radiofrequency signal, another termination control end 1 of inductance L, the other end ground connection of resistance R, capacitor C
2One end ground connection, its other end connects control end 2 respectively, through diode D
2Be connected on diode D
1With capacitor C
3Between.
Described cable TV radiofrequency signal control switch, inductance L can replace with resistance.
Its operation principle is:
According to the subscriber payment situation, in the time of need turn-offing user's cable TV signal, make the current potential of control end 2 be not less than the current potential of control end 1, diode D this moment
1End diode D
2Conducting was leaked diode D even have
1Cable TV signal also by capacitor C
2Shorted to earth produces decay to cable TV signal, influences user watched.
For strengthening the control of paid rating, but the current potential of frequent changes control end 2 increases interference function.Control end 1 is
Electronegative potential, diode D
1End, the current potential that is added in control end 2 conversion repeatedly makes diode D
2End or conducting.As diode D
2When ending, leaked diode D
1Cable TV signal shorted to earth not, leakage signal output is arranged; As diode D
2During conducting, leaked diode D
1The cable TV signal shorted to earth, the output of no leakage signal.Frequent changes just produces interference to the cable TV signal that the user receives like this, and it can't be televiewed, and because diode D
1End, the interference signal reverse isolation does not exert an influence to other user yet.
The utility model compared with prior art, have following advantage: this control switch prevents that effectively cable TV signal from leaking into output in off position the time, in the time can not turn-offing fully for high channel, apply interference again, thereby reach the purpose that effective control user watches cable TV with compensation.
Fig. 1 is the circuit diagram of the utility model one embodiment;
Radiofrequency signal is through capacitor C
1Input, capacitor C
1The other end respectively through inductance L connect control end 1, through diode D
1Difference connecting resistance R, diode D
2With by capacitor C
3The output radiofrequency signal, the other end ground connection of resistance R, diode D
2The other end connect control end 2 respectively and through capacitor C
2Ground connection.
Inductance L among the embodiment can replace with resistance.
Claims (2)
1, a kind of cable TV radiofrequency signal control switch comprises inductance L, capacitor C
1～3, diode D
1～2And resistance R, wherein capacitor C
1Termination radiofrequency signal input, the other end meets inductance L and diode D respectively
1, diode D
1Other end connecting resistance R and respectively through capacitor C
3The output radiofrequency signal is characterized in that: another termination control end 1 of inductance L, the other end ground connection of resistance R, capacitor C
2One end ground connection, its other end connects control end 2 respectively, through diode D
2Be connected on diode D
1With capacitor C
3Between.
2, cable TV radiofrequency signal control switch as claimed in claim 1, it is characterized in that: inductance L can replace with resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99220954U CN2400972Y (en) | 1999-05-17 | 1999-05-17 | Control switch for radio-frequency signal of wired TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99220954U CN2400972Y (en) | 1999-05-17 | 1999-05-17 | Control switch for radio-frequency signal of wired TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2400972Y true CN2400972Y (en) | 2000-10-11 |
Family
ID=34011604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99220954U Expired - Fee Related CN2400972Y (en) | 1999-05-17 | 1999-05-17 | Control switch for radio-frequency signal of wired TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2400972Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789777B (en) * | 2009-12-29 | 2011-08-10 | 北京大学 | Radio frequency transmitting/receiving transfer switch |
-
1999
- 1999-05-17 CN CN99220954U patent/CN2400972Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789777B (en) * | 2009-12-29 | 2011-08-10 | 北京大学 | Radio frequency transmitting/receiving transfer switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |