CN2395478Y - Radio frequency signal jammer for wired television - Google Patents
Radio frequency signal jammer for wired television Download PDFInfo
- Publication number
- CN2395478Y CN2395478Y CN99246863U CN99246863U CN2395478Y CN 2395478 Y CN2395478 Y CN 2395478Y CN 99246863 U CN99246863 U CN 99246863U CN 99246863 U CN99246863 U CN 99246863U CN 2395478 Y CN2395478 Y CN 2395478Y
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- frequency signal
- cable
- control switch
- attenuator circuit
- 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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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Details Of Television Systems (AREA)
Abstract
The utility model provides a radio frequency signal jammer for wired television, which comprises a casing. The utility model is characterized in that one or more than one attenuation circuits with the same line are fixed in the casing; each attenuation circuit comprises a power supply control switch and a control end, wherein, one end of the power supply control switch is connected with the control end and a radio frequency signal transmitting line, and the other end is connected to the ground; a resistor or an inductor is connected in series between the connecting points of the power supply control switches and the radio frequency signal transmitting lines of the adjacent attenuation circuits. When jamming does not need to be provided, the radio frequency signal is conductive straightly on the transmitting line, and when controlled potential is added to the control end, the radio frequency signal can be provided with jamming or multi-grade attenuation, achieving the purpose of controlling paid wired television.
Description
The utility model provides a kind of cable TV radiofrequency signal scrambler, belongs to TV signal scrambling apparatus 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 scramble device, the expense rating of paying according to the user.The technology report of at present existing this aspect, as the disclosed utility model patent of Chinese patent communique: 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: no matter whether need scrambling, the crystal diode of scrambler is in running order always, certain power consumption is arranged, and radiofrequency signal all must be through crystal diode in transmission, can't avoid the influence of scrambler to radiofrequency signal, reduce the transmission quality of cable TV signal virtually, and shortened the useful life of product.
The purpose of this utility model provides a kind of cable TV radiofrequency signal scrambler that cable TV signal is not had can carry out scrambling and need not scrambling user's cable TV signal the time influence.
The purpose of this utility model is achieved in that
Comprise a housing, the housing internal fixation has attenuator circuit, it is characterized in that: attenuator circuit comprises power control switch and control end, wherein a termination control end and the radio frequency signal transmission line road of power control switch, its other end ground connection.
Described cable TV radiofrequency signal scrambler, attenuator circuit can be a plurality of, is serially connected with resistance between the tie point on the power control switch of adjacent attenuator circuit and radio frequency signal transmission line road.
Described cable TV radiofrequency signal scrambler, power control switch can be diode, triode etc.
Described cable TV radiofrequency signal scrambler, the resistance that is connected in series between the tie point on the power control switch of adjacent attenuator circuit and radio frequency signal transmission line road also can be inductance.
Its operation principle is:
According to the subscriber payment situation, when not needing the scrambling of user's cable TV signal, not charged on the transmission line of radiofrequency signal, scrambler is in off position does not have power consumption, and radiofrequency signal is straight-through unaffected; When needing scrambling, apply a current potential at control end, the power control switch conducting makes a part of radiofrequency signal shorted to earth, and cable TV signal is produced decay, influences user watchedly, and the current potential that the frequent changes control end applies just can increase interference function.When needing multistage decay, a plurality of attenuator circuits can be set, add a current potential respectively at several control ends as required, realization produces multistage decay to cable TV signal.Owing to apply the previous stage attenuator circuit of CONTROLLED POTENTIAL the anti-signal of irritating of next stage attenuator circuit also there is decay, so other users are not exerted an influence yet.
The utility model compared with prior art has following advantage: can be to scrambling of user's cable TV signal or multistage decay, and when not needing scrambling or decay, scrambler is not worked, and radiofrequency signal is straight-through unaffected, simple in structure, perfect performance, long service life.
Fig. 1 is the circuit diagram that the utility model adopts an attenuator circuit embodiment;
Fig. 2 is the circuit diagram that the utility model adopts three attenuator circuit embodiment;
Among Fig. 1: be provided with an attenuator circuit in the housing 1, the positive pole of diode D connects control end and radio frequency signal transmission line road, its minus earth respectively.When needing scrambling, apply a current potential at control end, diode D connects and conducts, and makes a part of radiofrequency signal shorted to earth, and cable TV signal is produced decay, influences user watchedly, and the current potential that the frequent changes control end applies just can increase interference function.
Among Fig. 2: be provided with the attenuator circuit of three same structures in the housing 1, wherein diode D
1-3Positive pole respectively correspondence meet control end and radio frequency signal transmission line road, its minus earth, diode D
1～2Positive pole and the tie point on radio frequency signal transmission line road between be serially connected with resistance R
1, diode D
2-3Positive pole and the tie point on radio frequency signal transmission line road between be serially connected with resistance R
2Add a current potential respectively at control end as required, diode D
1～3～connect and conduct, realize cable TV signal is produced multistage decay.Because diode D
1The attenuator circuit at place is to diode D
2The anti-signal of irritating of the attenuator circuit at place also has decay, diode D
2The attenuator circuit at place is to diode D
3The anti-signal of irritating of the attenuator circuit at place also has decay, like this through decay layer by layer, so other users are not exerted an influence yet.
Claims (4)
1, a kind of cable TV radiofrequency signal scrambler, comprise a housing, the housing internal fixation has attenuator circuit, it is characterized in that: attenuator circuit comprises power control switch and control end, wherein a termination control end and the radio frequency signal transmission line road of power control switch, its other end ground connection.
2, cable TV radiofrequency signal scrambler as claimed in claim 1, it is characterized in that: attenuator circuit can be a plurality of, is serially connected with resistance between the tie point on the power control switch of adjacent attenuator circuit and radio frequency signal transmission line road.
3, cable TV radiofrequency signal scrambler as claimed in claim 1 or 2, it is characterized in that: power control switch can be diode, triode etc.
4, cable TV radiofrequency signal scrambler as claimed in claim 2 is characterized in that: the resistance that is connected in series between the tie point on the power control switch of adjacent attenuator circuit and radio frequency signal transmission line road also can be inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99246863U CN2395478Y (en) | 1999-10-29 | 1999-10-29 | Radio frequency signal jammer for wired television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99246863U CN2395478Y (en) | 1999-10-29 | 1999-10-29 | Radio frequency signal jammer for wired television |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2395478Y true CN2395478Y (en) | 2000-09-06 |
Family
ID=34032401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99246863U Expired - Fee Related CN2395478Y (en) | 1999-10-29 | 1999-10-29 | Radio frequency signal jammer for wired television |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2395478Y (en) |
-
1999
- 1999-10-29 CN CN99246863U patent/CN2395478Y/en not_active Expired - Fee Related
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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 |