CN2105817U - Cable tv terminal box with frequency modulation broadcast transimitter - Google Patents
Cable tv terminal box with frequency modulation broadcast transimitter Download PDFInfo
- Publication number
- CN2105817U CN2105817U CN 91224406 CN91224406U CN2105817U CN 2105817 U CN2105817 U CN 2105817U CN 91224406 CN91224406 CN 91224406 CN 91224406 U CN91224406 U CN 91224406U CN 2105817 U CN2105817 U CN 2105817U
- Authority
- CN
- China
- Prior art keywords
- cable
- terminal box
- antenna
- selective amplifier
- frequency modulation
- 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
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- Details Of Television Systems (AREA)
Abstract
The utility model provides a cable TV terminal box with a frequency modulation broadcast transmitter. The utility model comprises an outer shell, a TV cable socket, a frequency-selective amplifier and a subsection antenna. The frequency-selective amplifier and the antenna are placed in the outer shell of the cable TV terminal box. Frequency modulation signals transmitted from the TV cable are sent to space by the transmitter composed of the frequency-selective amplifier and the antenna, and receivers with frequency modulation waveband can receive the signals indoors without using a connecting line. The utility model is applied to the condition that the exist frequency modulation receivers are all not provided with input sockets.
Description
The utility model relates to a kind of structure of cable TV user terminal box.
The television terminal box that uses in including the cable television system of fm broadcast signal at present is all two delivery outlets, and a delivery outlet is the TV signal socket, and another is the FM signal socket.Yet at present the receiver of family expenses does not generally all have FM signal input socket, but it is electromagnetic to adopt telescopic antenna to receive the frequency modulation in space.And many receivers are not fixed placement, frequent shift position, thereby can't use frequency modulation socket on the television terminal box.
The purpose of this utility model is to propose a kind of cable television terminal box that can transmit FM signal with the connecting line of receiver that need not use.
The cable television terminal box of this band FM broadcasting reflector comprises a shell, a camera cable socket, a frequency selective amplifier and a bit of antenna.The center pole of the input termination camera cable socket of frequency selective amplifier, its output is connected on the antenna, and frequency selective amplifier and antenna all are loaded in the shell.
The reflector that frequency selective amplifier in this cable television terminal box and antenna are formed is transmitted into the space with the FM signal that transmission in the camera cable comes, and the receiver that generally has fm band just can both receive indoor, thereby need not to use connecting line.The fm broadcast signal level of cable TV user terminal is generally at 60-70dB(μ V/M) between, the sensitivity of FM receiver is mostly at 40dB(μ V/M) below, thereby frequency selective amplifier is as long as adopt the one-level transistor amplifier circuit can reach good audibility.
Accompanying drawing 1 is the outline drawing of this cable television terminal box;
Accompanying drawing 2 is the line map of this terminal box;
Accompanying drawing 3 is the schematic diagram of antenna.
The profile of this as shown in Figure 1 cable television terminal box is identical with the cable television terminal box that has only a socket, and (1) is shell among the figure, and (2) are cable socket, and frequency selective amplifier and antenna all are loaded in the shell.
As shown in Figure 2, the frequency selective amplifier of this cable television terminal box can adopt a cascode frequency selective amplifier, also can adopt common-base amplifier exclusive disjunction amplifier circuit.The center pole of cable socket (3) is received on the inductance L 0 of amplifier in, and the not end of output line chart L1 is reserved one section copper wire, as antenna (4), as shown in Figure 3 this copper wire is curved squarely, place along the inwall of shell, good transmitting antenna.Also can on printed substrate, make a Copper Foil frame as antenna.
This amplifier architecture is simple, can deposit by cloth on the printed substrate in original cable television terminal box, and its power supply can be contained in the end box with No. 5 batteries of a joint, adorns a mains switch on lid, also can be by the subscriber's amplifier centrally connected power supply.
Claims (2)
1, a kind of cable television terminal box with the FM broadcasting reflector, comprise a shell (1) and a camera cable socket (2), it is characterized in that it also comprises a frequency selective amplifier, with a bit of antenna (4), the center pole (3) of the input termination camera cable socket of frequency selective amplifier, its output is connected on the antenna, and frequency selective amplifier and antenna are all loaded onto in the shell.
2, cable television terminal box as claimed in claim 1 is characterized in that described frequency selective amplifier is a cascode frequency selective amplifier, and described antenna is the one section copper wire that links to each other with the frequency selective amplifier output winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91224406 CN2105817U (en) | 1991-09-02 | 1991-09-02 | Cable tv terminal box with frequency modulation broadcast transimitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91224406 CN2105817U (en) | 1991-09-02 | 1991-09-02 | Cable tv terminal box with frequency modulation broadcast transimitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2105817U true CN2105817U (en) | 1992-05-27 |
Family
ID=4930886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91224406 Granted CN2105817U (en) | 1991-09-02 | 1991-09-02 | Cable tv terminal box with frequency modulation broadcast transimitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2105817U (en) |
-
1991
- 1991-09-02 CN CN 91224406 patent/CN2105817U/en active Granted
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |