JPS6223145Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention converts the received television signal, which is transmitted in a mixture of the UHF and VHF bands, into the UHF band.
This invention relates to a U/V splitter that splits signals into the VHF band and receives signals.

In a receiving system that uses a common coaxial cable to transmit television reception signals in the UHF band and VHF band using a UHF antenna and a VHF antenna, U and V signals are separated for connection to the antenna terminal of the television receiver. A wave device is required.

Traditionally known U/V branching filters have been made with various combinations of input and U/V output terminal structures and matching impedances to create a variety of products, especially those for home use. There are no known substances that have selectivity themselves.

For example, if the UHF antenna terminal of a television receiver has a 300Ω balanced input and the VHF antenna terminal has a 75Ω unbalanced input, use a U/V splitter that is compatible with that, that is, a 300Ω UHF terminal and a 75Ω VHF terminal. A equipped U/V splitter is used. When setting up a video system by combining a new video deck (VTR) with a television receiver whose antenna is wired using such a U/V splitter, it goes without saying that the television receiver The connection of the U/V splitter is removed from the antenna terminal of the VTR, and instead it is connected to the UHF and VHF antenna output terminals of the VTR using a parallel feeder and coaxial cable. The removed U/V splitter will be connected to the antenna input terminal of the VTR, but if the antenna input terminal of the VTR has a single terminal structure for both U and V, the antenna coaxial from the public antenna will be connected to the antenna input terminal of the VTR. It is necessary to remove the duplexer from the cable or the coaxial cable from the indoor series unit and connect the coaxial cable directly to the VTR's U/V antenna input terminal, which requires removing the coating from the tip of the coaxial cable and reprocessing it. Not only is this difficult for ordinary people, but it can also cause noise reception, and connecting the coaxial cable directly to the terminal is likely to cause the core wire to break. , extra processing effort is required.

This idea was made in view of the above-mentioned situation, and allows the U/V splitter that has been used up to now to be used as a plug that can be connected to the antenna terminal when setting up a VTR with a single terminal type antenna input. In this way, it is an object of the present invention to provide a U/V duplexer that can be used both as a one-terminal type and a two-terminal type.

That is, the U/V splitter of the present invention for achieving this purpose is equipped with a switch that mixes the split UHF signal and VHF signal by switching and sends the mixed signal to the VHF terminal. corrugated
The VHF terminal is a plug-in type that can be inserted into and removed from the 75Ω unbalanced input terminal jack of a television receiver or VTR. Therefore, as long as the duplexer of the present invention is used, television receivers and
Whether the VTR's antenna input terminal is one-terminal type or two-terminal type, there is no need to remove the duplexer from the coaxial cable from the public antenna or indoor series unit, and in either case, it can be handled with a single switch operation. This eliminates the inconvenience associated with reprocessing the tip of the coaxial cable.

Next, the U/V duplexer of this invention will be explained with reference to the drawings. Fig. 1 is a perspective view showing its appearance, and Fig. 2
The figure is a circuit diagram showing an example of a circuit configuration.

A duplexer case 1 is attached to the tip of a coaxial cable 2 from a public antenna or an indoor series unit, and the coaxial cable 2 is connected and fixed to an input terminal 3 inside the case 1. A plug pin terminal 4 as a 75Ω unbalanced VHF terminal protrudes from the end face of the case 1, a feeder wire 6 having a lug terminal 5 as a 300Ω balanced UHF terminal is taken out from the top face, and a switch knob 7 is peeked out from the front face. ing. This switch knob 7 is used to operate the switch 8 shown in the circuit diagram of FIG.
While the signal appears, high pass filter 1 is connected to terminal 5.
A UHF signal passing through 0 appears, and switch 8 closes contact b.
When switched to the side, both filters 9 and 10 are connected to terminal 4.
A VHF signal and a UHF signal from the circuit are mixed and appear, and at this time terminal 5 is made to float from the circuit. Note that 11 is a matching box.

The U/V duplexer of the present invention having the above configuration has its insertion pin terminal 4 connected to the television receiver.
By inserting it into the VHF antenna input terminal (75Ω) and connecting the lug terminal to the UHF antenna input terminal (300Ω), and leaving the switch 8 switched to the contact a side (SPLIT) using the knob 7, the U.
It performs a V branching function. and two terminal type
When setting up a VTR in conjunction with this television receiver, remove the U/V splitter from the television receiver's UHF and VHF antenna input terminals and connect the VTR's UHF and VHF antenna output terminals instead. Connect the feeder and coaxial cable and remove the U/V splitter for VTR UHF.
Connect to each antenna input terminal of 300Ω and 75Ω for VHF in the same way and switch knob 7 as is (SPLIT)
You can keep it on your side. Also, if the VTR's antenna input terminal is a 75Ω single terminal type for both U and V,
After connecting the VTR and the television receiver in the same way, switch the switch knob 7 of the U/V splitter, connect the switch 8 to the contact b side (MIX), and connect the plug pin terminal 4 to the U/V splitter of the VTR. It is sufficient to insert it into the single-terminal antenna input terminal for V common use, and leave the lug terminal 5 open.

As described above, according to the present invention, it is possible to input either a one-terminal or two-terminal antenna input type without removing the duplexer from the coaxial cable from the antenna system.
It can also be used to set up a VTR, thereby eliminating unnecessary labor, waste of parts, and concerns about reception noise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of the U/V duplexer of the present invention, and FIG. 2 is a circuit diagram showing an example of its circuit configuration. The same symbols in the figure indicate corresponding parts, 1... Duplexer case, 2... Coaxial cable, 3... Input terminal, 4
...Plug-in pin terminal (VHF terminal), 5...Lug terminal (UHF terminal), 7...Switch knob, 8...
Switch, 9...Low pass filter, 10...High pass filter.

Claims (1)

[Claims for Utility Model Registration] (1) An input terminal that receives a mixed input signal of UHF and VHF, and
A low-pass filter that extracts the VHF signal, a high-pass filter that extracts the UHF signal in the input signal received at the input terminal, a VHF terminal that outputs the VHF signal from the low-pass filter, and a UHF terminal that outputs the UHF signal from the high-pass filter. In a U/V branching filter with
A U/V splitter characterized by being equipped with a switch that mixes the signal with the signal and transmits it to the VHF terminal. (2) The U/V duplexer according to claim 1, wherein the VHF terminal is of a plug-in type that can be inserted into and removed from an input terminal jack of a receiver, etc.