CN204790343U - Long wave standard electric wave blind area constantly covers system - Google Patents
Long wave standard electric wave blind area constantly covers system Download PDFInfo
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- CN204790343U CN204790343U CN201520486949.7U CN201520486949U CN204790343U CN 204790343 U CN204790343 U CN 204790343U CN 201520486949 U CN201520486949 U CN 201520486949U CN 204790343 U CN204790343 U CN 204790343U
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Abstract
The utility model discloses an one kind of the telecommunication field is utilized the public TV network in CATV broadband to carry out long wave standard electric wave blind area constantly covers system, including the outdoor antenna of accepting, indoor radiating antenna, modulator, spliter, distributor and demodulator, its characterized in that: long wave standard electric wave is constantly received by the outdoor antenna of accepting, the outdoor antenna of accepting includes stationary antenna and adjustable antenna and change over switch, stationary antenna forms loop aerial by frame and coil, adjustable antenna is by the bar magnet, the coil, electric capacity and binding post constitute, adjustable antenna setting is in stationary antenna's frame, the outdoor antenna of accepting passes through electromagnetic induction and responds to the signal to the magnetic rod antenna, and, the circuit is connected to the receipt modulator after handling with the here signal, FM frequency modulation signal output to spliter after the modulation, it is connected with the distributor to mix back output with the cable television TV signal, distributor output frequency division two tunnel, be connected with the TV set all the way, launch through demodulator late arrival radiating antenna on another way.
Description
Technical field
The one that the utility model relates to telecommunications field utilizes CATV broadband public TV network to carry out coverage system for long-wave standard time electric wave dead zone, is specially adapted to the moment automatic calibration to indoor radio controlled timepiece.
Technical background
Existing market occurred the 5th generation time set (Wave timepiece), so-called Wave timepiece, fuselage is made up of atomic clock and radio receiving system, correct time is sent by national time service center, by radio receiving system receive, after CPU process displaying time, Wave timepiece 300,000 years errors can not more than one second.Be exactly briefly a kind of receive long-wave standard time-code, can the wrist-watch of automatic Proofreading correction time.Radio controlled timepiece is in mankind's clocking technique development course, after hourglass, corona, mechanical clock, quartz clock the 5th generation timer.The appearance of radio controlled timepiece technology and product is the revolution again of mankind's timing history.
Importantly radio controlled timepiece will receive national time service center, and the long-wave standard time wave sent can automatic correcting time.The distance of long wave transmissions is distant for other electric wave, but the wavelength of long wave is longer, more weak to its above ground structure penetration power.As the business district of down town and the high building of residential block more, and buildings is than comparatively dense, and its long wave can only pass from roof.So the radio controlled timepiece of indoor, just cannot receive national time service center, the long-wave standard time wave time-code sent.Therefore just need long-wave standard time wave time-code, be sent to the indoor non-inductive region of long wave standard wave.Cable transmission is a kind of effective way, but lays private cable to the indoor each family of each layer, and quantities is large, construction cost is high, sometimes cannot be applicable to built building.In CATV common line system, splitter, divider, amplifier mostly just adapt to the frequency of 10MHz ~ 1500MHz, and most equipment all cannot by the signal of long wave bandwidth (68.5KHZ).In addition, due to low frequency, can there is a large amount of leakage currents in cable, because the obstacle that vibrates easily occurs the leakage current turning back to receiving antenna.So the utility model provides a kind of, the long-wave standard time wave after receiving antenna receives, by the public wired TV network transmission of CATV to each floor in building, each family, each room, thus completes the covering of indoor long wave etalon time electric wave.
Summary of the invention
Goal of the invention of the present utility model is to provide one and utilizes the public cable TV network of CATV, as transmission platform, long-wave standard time wave using modulating FM frequency as carrier wave, through network branches device, divider, transfer to each floor in building, each family, each room, realize the covering of long-wave standard time wave in building, reach indoor radio controlled timepiece automatic correcting time object.
The present utility model is achieved through the following technical solutions:
A kind of coverage system for long-wave standard time electric wave dead zone, comprise outdoor and accept antenna, indoor radiating antenna, modulator, splitter, divider and detuner, it is characterized in that: long-wave standard time wave accepts antenna by outdoor and receives, outdoor accepts antenna and comprises fixed antenna, adjustable antenna and change-over switch, change-over switch is connected and fixed antenna and adjustable antenna, fixed antenna circularizes antenna by framework and coil groups, adjustable antenna is by bar magnet, coil, electric capacity and connection terminal formed, adjustable antenna is arranged in the framework of fixed antenna, outdoor accept antenna by electromagnetic induction by induction of signal to magnetic rod antenna, and this signal is connected to reception modulator after processing of circuit, FM FM signal after modulation exports splitter to, mix rear output with CATV (cable television) TV signal to be connected with divider, divider output frequency division two-way, one tunnel is connected with televisor, another road is launched to radiating antenna after detuner.
Described receiving antenna refers to the outdoor long-wave antenna of roof, and the long-wave signal received by antenna is transferred to reception modulator.Because long-wave signal frequency is lower, there is distributed capacitance over the ground in cable transmission, and produces signals leakiness, causes signal attenuation, and low-frequency range transmission cable distance is more short better for this reason.
Described reception modulator is the long-wave standard time wave that will receive, and posts and is loaded on FM high-frequency fm signal, using FM signal as carrier wave, transfers to rear class by 75 Ω impedance high frequency cables.In order to reduce the loss of low-frequency range signal transmission, receive modulator installation site, when mounting condition is permitted, should near aerial position, object is to shorten low-frequency cable transmission range, reduces the loss of signal in transmission.
Described splitter and divider are the passive devices that a kind of high-frequency wideband signal power is distributed.The bandwidth of frequency transmission signal can reach 3-1000(MHZ) and, structure is simple, work does not need power supply.Splitter and divider not only have the distribution function of power signal, the more important thing is that it is while distributing signal, the equipment of port are played to the effect of impedance matching.Splitter is used in main line signal branch transmission, and divider distributes for the signal of terminal device televisor.Due to the frequency after the modulation of long-wave standard time wave, the frequency of high frequency frequency modulation section, as transport property, bandwidth requirement, mate completely with CATV public TV network, the carrier frequency of the long-wave standard time wave therefore transmitted in this network, successfully can be transferred to the direct detuner of outlet of terminal distributor.
Due to long-wave standard time wave, modulate high frequency frequency modulation section, for carrier wave carry out transmission, so in terminal distributor outlet, also modulation signal will be reduced, be connected to detuner for this reason, by the demodulation of detuner, inspection frequency modulation removal Carrier section, reduction long-wave standard time wave, goes emitting antenna radiation again by amplification, power amplifier.
Technique effect: at Business building, the long wave etalon time electric waves such as apartment, radiowave timepiece in non-inductive region, the auto modification in moment cannot be carried out, due to coverage system for long-wave standard time electric wave dead zone, utilize CATV broadband public TV Internet Transmission long-wave standard time wave, with the form of most convenient, most scientific technological means, most economical cost drops into, achieve the non-inductive region of long-wave standard time wave radiation function again, for radio controlled timepiece is in the non-inductive district of long-wave standard time wave, receive long-wave standard time wave, carry out moment auto modification, provide effective approach.
Accompanying drawing explanation
Fig. 1 is the overall schematic of coverage system for long-wave standard time electric wave dead zone;
Fig. 2 is that outdoor accepts antenna assumption diagram.
In figure: receiving antenna 1, modulator 2, splitter 3, divider 4, detuner 5 and radiating antenna 6 and framework 7, tours antenna 8, bar magnet 9 and magnetic rod antenna 10.
Embodiment
Below in conjunction with accompanying drawing, content of the present utility model is described further:
As shown in Figure 1, coverage system for long-wave standard time electric wave dead zone, it is made up of receiving antenna 1, modulator 2, splitter 3, divider 4, detuner 5 and radiating antenna 6.The signal outlet end of described receiving antenna 1, connect and receive modulator 2, high frequency frequency-modulated wave after modulating exports splitter 3 to, with the signal mixed transport of CATV broadband cable, described splitter 3 signal output part is connected with divider 4, the output port of described divider 4, one end is connected with televisor 41, the other end 42 connects detuner 5, after interlock circuit amplification, power amplifier process, exports emitting antenna 6 radiation again to.Standard long wave (68.5kHz) Signal reception is first got off by receiving antenna 1 by it, then after modulator 2 is modulated, frequency conversion is carrier frequency, (75MHz) FM signal, through cable transmission to splitter 3 by CATV public TV network signal and (75MHz) long-wave standard time wave CF signal, be mixed transmission, divider 4 is sent to through 75 Ω high frequency cables, frequency division is carried out by divider 4, by TV signal and long wave CF signal, exported by different ports, one end is connected with TV set aerial socket, the other end is connected with detuner 5 input port, frequency modulation removal Carrier section is examined through detuner 5, reduction long-wave standard time wave (68.5kHz) signal, amplify through interlock circuit, transfer to radiating antenna 6 after power amplifier process to send.The frequency now sending signal is long-wave standard time wave (68.5KHz), can be calibrated radio wave clock.Due to the miniaturization of radiating antenna 6 again, as required, radiating antenna can be moved and puts near radio wave clock, passable, meet indoor with less emissive power, the needs of radio wave clock Received signal strength.
Claims (2)
1. a coverage system for long-wave standard time electric wave dead zone, comprise outdoor and accept antenna, indoor radiating antenna, modulator, splitter, divider and detuner, it is characterized in that: long-wave standard time wave accepts antenna by outdoor and receives, outdoor accepts antenna and comprises fixed antenna, adjustable antenna and change-over switch, change-over switch is connected and fixed antenna and adjustable antenna, fixed antenna circularizes antenna by framework and coil groups, adjustable antenna is by bar magnet, coil, electric capacity and connection terminal formed, adjustable antenna is arranged in the framework of fixed antenna, outdoor accept antenna by electromagnetic induction by induction of signal to magnetic rod antenna, and this signal is connected to reception modulator after processing of circuit, FM FM signal after modulation exports splitter to, mix rear output with CATV (cable television) TV signal to be connected with divider, divider output frequency division two-way, one tunnel is connected with televisor, another road is launched to radiating antenna after detuner.
2. coverage system for long-wave standard time electric wave dead zone according to claim 1, is characterized in that: described splitter and divider are the passive device that a kind of high-frequency wideband signal power is distributed, and the bandwidth of frequency transmission signal is 3MHZ-1000MHZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520486949.7U CN204790343U (en) | 2015-07-08 | 2015-07-08 | Long wave standard electric wave blind area constantly covers system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520486949.7U CN204790343U (en) | 2015-07-08 | 2015-07-08 | Long wave standard electric wave blind area constantly covers system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204790343U true CN204790343U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520486949.7U Active CN204790343U (en) | 2015-07-08 | 2015-07-08 | Long wave standard electric wave blind area constantly covers system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204790343U (en) |
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2015
- 2015-07-08 CN CN201520486949.7U patent/CN204790343U/en active Active
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