JPH08154213A - Booster - Google Patents

Abstract

PURPOSE: To improve isolation between an UHF input terminal and an output terminal, to make the outer size compact and to provide the output of a UHF signal and a VHF signal with excellent quality in the booster receiving the UHF signal and the VHF signal and outputting them from one output terminal. CONSTITUTION: A UHF amplifier circuit is arranged adjacent to a ridge of a board B on which a UHF input terminal C and an output terminal are provided. A VHF input terminal D is provided between the UHF input terminal C and the output terminal E. Furthermore, a VHF transmission circuit G is arranged next to the UHF amplifier circuit F. A connection line interconnecting the VHF input terminal D and an input terminal of a VHF transmission circuit is bypassed at the outside of the UHF input terminal C to avoid the effect to a connection line interconnecting the UHF input terminal C and the input terminal of the UHF amplifier circuit F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inputs a UHF signal and a VHF signal, amplifies at least the UHF signal of them, and outputs the amplified UHF signal and the VHF signal from one output end. Regarding the booster you are doing.

[0002]

2. Description of the Related Art As shown in FIG. 11, a VHF input terminal Dj, a UHF input terminal Cj, and an output terminal Ej are arranged in parallel on one edge 3j of a substrate Bj. On the board Bj, the edge 3j
The UHF amplifier circuit Fj is arranged adjacent to the VHF amplifier circuit and the VHF amplifier circuit Gj is arranged next to the UHF amplifier circuit Fj. Between the UHF input terminal Cj and the input terminal 7j of the UHF amplifier circuit Fj, the V
Between the HF input terminal Dj and the input terminal 10j of the VHF amplifier circuit Gj, the output terminal Ej and the output terminal of the UHF amplifier circuit Fj.
8j and the output terminal 11j of the VHF amplifier circuit Gj are connected by connecting lines H1j, H2j, H3j, respectively.

In such a booster, each terminal
Since Dj, Cj, and Ej are lined up on one edge 3j of the substrate Bj,
When the board Bj is housed in a case for outdoor installation, in that case, through holes for transmission lines for UHF input, VHF input, or output are collectively provided to ensure waterproofness ( Each of the above terminals can be located on the side of the bottom wall (usually). When using the booster, the UHF TV signal and the VHF TV signal can be output from the common output terminal Ej. Therefore, in the TV receiver connected to the output terminal Ej, the UHF TV signal and the VHF TV signal are output. Any of the signals can be used.
In addition, when each signal is used, the signal whose level has been increased by being amplified can be used, so that a high quality screen can be obtained. Furthermore, in the booster itself,
As described above, UHF input terminal Cj and output terminal Ej and UHF
Since the amplifier circuit Fj is adjacent to the amplifier circuit Fj and the path through which the UHF TV signal passes can be shortened, the loss of the UHF TV signal on that path can be reduced. Further, in the arrangement of various terminals as described above, since the UHF signal and the VHF signal can be transmitted through the connecting lines H1j and H2j respectively without mutual influence, both the UHF signal and the VHF signal can be properly amplified and a high quality UHF signal and VHF signal can be obtained. Can output signals.

[0004]

In this conventional booster, the UHF input terminal Cj, the VHF input terminal Dj and the output terminal are used.
Since Ej is arranged as above, UHF input terminal
The distance L between Cj and the output terminal Ej is shortened and the isolation between them is reduced, resulting in UH
When the gain of the F amplifier circuit Fj is high, there is a problem that oscillation easily occurs. Further, in order to eliminate the above problems, if the distance L between the UHF input terminal Cj and the output terminal Ej is increased so as to obtain a sufficiently large isolation, VH is correspondingly increased.
The distance L'between the F input terminal Dj and the output terminal Ej has to be increased, which causes a problem in that the outer shape of the booster is enlarged.

The booster of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. The first purpose is to place the UHF input terminal, the VHF input terminal and the output terminal in a corresponding position on the side of the wall where the insertion holes for various transmission lines are collectively provided when the substrate is stored in a case for outdoor installation. It is to provide a booster that can. The second purpose is to input UHF signal and V
The HF signal can be output from a common output terminal, and when the output signal is used, either the UHF signal or the VHF signal can be arbitrarily used. A third object is to allow the input UHF signal to be amplified to a high level and output even if the input UHF signal is a low level in the above case. A fourth object is to make it possible to shorten the UHF signal transmission path so that the loss in transmitting the UHF signal can be reduced when the input UHF signal is amplified and output. The fifth purpose is UHF
It is possible to leave a large gap between the input terminal and the output terminal as far as possible so that a large isolation can be obtained, and as a result,
An object of the present invention is to provide a booster capable of making it difficult to cause an oscillation failure even if the gain of the UHF amplifier circuit is high. A sixth object is to make it possible to reduce the size and size of the outer shape in designing. The seventh object is that even if the external form is made compact, when the input UHF signal is transmitted to the UHF amplifier circuit, V
I can communicate without being affected by the HF signal,
As a result, it is possible to output an amplified high-quality UHF signal. An eighth object is that the VHF signal itself can be transmitted from the VHF input terminal to the VHF transmission circuit without receiving interference from others, even if the consideration is given to eliminate the influence of the VHF signal on the UHF signal. The result is that a high quality VHF signal can be output as a result. Other objects and advantages will be readily apparent from the drawings and the following description related thereto.

[0006]

In order to achieve the above object, a booster according to the present invention has a UHF input terminal for inputting a UHF signal and a VHF signal for inputting a UHF signal to one edge of a substrate. VHF input terminal and UH
Output terminals for outputting the F signal and the VHF signal are arranged in parallel in order, and further, on the substrate, a UHF amplifier circuit and a VHF are provided.
And a transmission circuit on the side of the edge where the above-mentioned terminals are provided.
The F amplifier circuit is located, and the VHF transmission circuit is located far from the edge, and the UHF input terminal and U
Between the input terminal of the HF amplifier circuit and the output terminal and the U
The output terminals of the HF amplifier circuit are connected by connecting lines, and the VHF input terminal and the input terminal of the VHF transmission circuit and the output terminal and the output terminal of the VHF transmission circuit are respectively connected. In the booster connected by a connecting line, the connecting line connecting between the VHF input terminal located between the UHF input terminal and the output terminal and the input end of the VHF transmission circuit is the UHF input terminal. The outside of the UHF input terminal is detoured in order to avoid giving an influence to the connecting line connecting the input end of the UHF amplifier circuit.

[0007]

Since the UHF input terminal, the VHF input terminal and the output terminal are arranged side by side on one edge of the board, when the board is housed in the case, those terminals are adjacent to one wall of the case. It is possible to position it. Providing the VHF input terminal between the UHF input terminal and the output terminal is
It is possible to increase the distance between the HF input terminal and the output terminal, to provide a large isolation between them, and to avoid an increase in external form. UH
The UHF signal coming into the F input terminal is amplified by the UHF amplifier circuit and output from the output terminal. Further, the VHF signal coming into the VHF input terminal passes through the VHF transmission circuit and is output from the output terminal. The provision of the UHF amplifier circuit adjacent to the UHF input terminal and the output terminal means that the UHF amplifier circuit is connected to the UHF amplifier circuit and the UHF amplifier circuit is connected to the output terminal.
The loss when transmitting the HF signal is reduced. UH of the connecting line connecting the VHF input terminal and the input end of the VHF transmission circuit
The layout that bypasses the F input terminal is from the UHF input terminal to the UH
VH for transmission of UHF signal to input terminal of F amplifier circuit
Prevents the influence of the F signal. Also, selecting the connection line to be bypassed as the connection line for the VHF signal minimizes interference to the bypassed connection line.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 showing the positional relationship of various members in the booster
Further, in FIG. 4 showing the connection relationship between them, A is a case for accommodating various circuits in the booster in a protected state, and has a sufficient waterproof property for outdoor installation. The case is made of, for example, synthetic resin, but may be made of metal. Reference numerals 1a, 1b, 1c and 1d denote the upper wall, the bottom wall and the left and right side walls in the above case, respectively. Reference numerals 2a, 2b and 2c indicate the presence of insertion holes provided in the bottom wall 1b for inserting transmission lines for UHF input, VHF input and output, respectively. Reference numeral B denotes a board provided in the case, which is, for example, a circuit board (referred to as a printed board) provided with a circuit conductor such as a signal transmission conductor or a ground conductor on one surface or both surfaces of an insulating plate. Reference numeral 3 denotes an edge portion of the board B which is located adjacent to the bottom wall 1b when the board B is housed in the case A.

Next, various terminals provided on the edge portion 3 of the circuit board B will be described. C is a UHF input terminal provided at one end 3a of the edge portion 3 for inputting a UHF signal, for example, a UHF television signal. D is a VHF input terminal provided adjacent to the UHF input terminal C in the edge portion 3 for inputting a VHF signal, for example, a VHF television signal. The VHF input terminal D is provided in an empty space between the UHF input terminal C and the next output terminal E. E is an output terminal provided at the other end 3b of the edge portion 3 and is for outputting the UHF signal and the VHF signal. Above UHF input terminal C
By arranging the output terminal E and the output terminal E at the positions as described above, the distance between them is maximized, and as a result, the isolation between them is such that the maximum value is obtained on the substrate. Has become. The terminals C, D, E are all provided on the front surface of the board B (the surface shown in FIG. 1), and their positions are the insertion holes 2a, 2
It corresponds to the positions of b and 2c. Also, these terminals C, D,
E is the hot side terminals C1, D1, E1 and the ground side terminal C2,
It is composed of D2 and E2. As these terminals, in this example, a structure in which a coaxial cable can be directly attached as a transmission line for transmitting the above signals is shown.The hot side terminal is the cable core wire mounting terminal and the ground side terminal is the cable braid mounting It is a terminal. Moreover, the hot-side terminal and the ground-side terminal are arranged side by side in the axis 2d direction of the insertion hole in order to connect the end of the coaxial cable inserted through the insertion hole in a straight state. As is well known, the hot side terminal is a metal receiving piece 4a attached to the board B and a fixing screw 4b screwed to the receiving piece 4a for fixing the core wire thereto.
The ground side terminal is composed of a metal receiving piece 5a attached to the board B, a mounting bracket 5b for attaching a braid thereto, and a tightening screw 5c screwed to the receiving piece 5a. . The receiving pieces 5a of the respective ground-side terminals C2, D2, E2 are integrally formed with each other as shown in the drawing, and this is connected to the ground conductor of the circuit conductors provided on the back surface of the substrate B. .

Next, the signal circuit provided on the circuit board B will be described. F is a UHF signal amplifying circuit, which is provided at a location adjacent to the edge 3 on the substrate B.
Indicates an input end thereof, and 8 indicates an output end thereof. Those input ends 7
The distance between the output terminal 8 and the output terminal 8 is sufficient to prevent coupling of UHF signals between them. G is a VHF signal transmission circuit, which is provided on the side of the substrate B far from the edge 3. Reference numeral 10 indicates the input end, and 11 indicates the output end. H1 is a connection line that connects the UHF input terminal C and the input end 7 of the UHF amplifier circuit F, and connects the hot-side terminal C1 and the input end 7 for signal transmission. The connecting line H1 is U
Hot side terminal C1 to minimize the loss of HF signal transmission
And the input end 7 are linearly connected. H2 is a connection line that connects the VHF input terminal D and the input end 10 of the VHF transmission circuit G, and connects the hot-side terminal D1 and the input end 10 for signal transmission. The connection line H2 is provided in a state of bypassing the outside of the UHF input terminal C in order to avoid mutual influence due to intersection or proximity with the connection line H1. For example, as shown in the drawing, the hot side terminal C1 and the ground side terminal C2 are arranged so as to extend around the outside of the UHF input terminal C along the peripheral edge of the substrate B so as not to cross the connection line H1. There is. H3 is a connection line that connects the output terminal 8 of the UHF amplifier circuit F and the output terminal E, and connects the output terminal 8 and the hot side terminal E1 for signal transmission. The connecting line H3 is UH
They are connected in a straight line so that the transmission loss of the F signal is minimized. The output terminal 11 of the VHF transmission circuit G is connected to the output terminal 8 of the UHF amplifier circuit F, and the connection line H3
Is commonly used as a connection line for connecting the output terminal 11 of the VHF transmission circuit G and the output terminal E. However, they may be connected by separate connecting lines. Each of the connection lines H1, H2, H3 is composed of a circuit conductor provided on the back surface of the substrate B.

Next, as an example of the VHF transmission circuit G, V
Regarding the amplifier circuit for the HF television signal, FIG. 2 showing the mechanical arrangement relationship of various circuits in the amplifier circuit and FIG. 5 showing the electrical connection relationship will be described. Reference numeral 13 denotes an auxiliary input terminal, which is used when the UHF signal and the VHF signal are input to the UHF input terminal C in a mixed state. Reference numeral 14 is a filter for passing the VHF television signal and blocking the passage of the UHF television signal, which is a low pass filter having a pass band of 0 to 222 MHz. Reference numeral 15 is an input selector switch circuit for switching between the signal from the input terminal 10 and the signal from the filter 14. 16 is an FM signal filter for blocking the passage of FM signals,
A high-pass filter that passes only signals of 90 MHz or higher is used. Reference numeral 17 denotes an FM filter changeover switch circuit for selecting whether or not to pass a signal through the FM signal filter 16. Reference numeral 18 denotes a filter for passing a VHF television signal, as shown in FIG. 5, a bandpass filter 18a having a pass band of 170 to 222 MHz for passing a high band VHF television signal, and a low band VHF.
A bandpass filter 18b having a pass band of 76 to 108 MHz is connected in parallel to pass a television signal. Reference numeral 19 is a first amplifier circuit for amplifying a VHF television signal, which outputs a signal of 76 to 222 MHz, for example, 10
It has the ability to amplify more than dB. Reference numeral 20 denotes a gain adjusting circuit, which is capable of outputting a signal input to itself after being attenuated by a desired level (for example, about 0 to 10 dB) by a volume operation. 21 is a second amplifier circuit, which is the first amplifier
It has the same function as the amplifier circuit 19. 22 is the above filter 14
It is a low-pass filter having the same purpose and function. Reference numeral 23 indicates a ground conductor existing between the above circuits. These ground conductors 23 make it difficult to couple the circuits shown by the above-mentioned symbols 14 to 22 at high frequencies, and at the same time sufficiently exhibit the well-known ground function, and have a width sufficient to prevent oscillation failure. I am configuring. Reference numeral 24 denotes a connecting element for connecting the respective circuits, which is provided in a state of being non-conductive with the earth conductor 23 and straddling it. As the connecting element 24, a jumper wire, a coil, a capacitor, a resistor or the like is used according to each circuit described above. In the VHF amplifier circuit, since the input terminal 10 and the output terminal 11 are located near both ends of the substrate B, the circuits indicated by the reference numerals 18 to 22 can be arranged in a substantially straight line.

Next, the UHF amplifier circuit F will be described with reference to FIG. 3 showing the mechanical layout relationship of various circuits in the UHF amplifier circuit F and FIG. 6 showing the electrical connection relationship thereof. 25 is UHF
Is a filter for passing the television signal of VHF and blocking the passage of the television signal of VHF, and a high-pass filter having a pass band of 470 to 770 MHz is used. 26 is UHF
The first amplifier circuit for amplifying the TV signal of
It has the ability to amplify a 770 MHz signal by, for example, 10 dB or more. 27 is a gain adjusting circuit, which is the VHF amplifier circuit G
It has the same function as the gain adjusting circuit 20 of. 28 and 29 are second and third amplifier circuits for amplifying UHF television signals, respectively, which have the same function as the first amplifier circuit 26. Reference numeral 30 is a high-pass filter having the same purpose and function as the filter 25. The low-pass filter 22 of the VHF amplifier circuit G and the high-pass filter 30 form a known mixing circuit. Reference numerals 31 and 32 denote earth conductors and connecting elements having the same purpose and function as the earth conductor 23 and connecting element 24 of the VHF amplifier circuit G, respectively. In the UHF amplifier circuit F, since the input end 7 and the output end 8 are located near both ends of the substrate B, the respective circuits 25 to 30 can be arranged in a substantially straight line.

A method of using the booster having the above structure will be described. A transmission line connected to the UHF antenna is connected to the UHF input terminal C, and a transmission line connected to the VHF antenna is connected to the VHF input terminal D. In this case, the changeover switch circuit 15
Is switched to a state where the signal from the input terminal 10 passes. Further, the FM filter changeover switch circuit 17 is switched to the side where the filter 16 is not passed, for example. A transmission line connected to the television receiver is connected to the output terminal E via a known power supply device. In this state, the operating current sent from the power supply device is output from the output terminal E to the amplifier circuits 19, 21,
The signals are sent to 26, 28, and 30 through a known supply line (not shown), and their amplification circuits operate.

In the above state, the UHF input terminal C has a U
When an HF television signal is input, the signal is applied to the input terminal 7 of the UHF amplifier circuit F from the hot side terminal C1 through the connection line H1. In this case, the UHF input terminal C is provided at a position adjacent to the input end 7 and the distance passing through the connection line H1 is short, so that the loss of the UHF signal there is very small. UHF signals given to the input terminal 7 are represented by reference numerals 25, 26, 27, 28,
It is output to the output end 8 through the members 29 and 30. The signal is given to the hot side terminal E1 of the output terminal E through the connection line H3. In this case, since the output terminal E is provided at a position adjacent to the output end 8 and the distance through the connecting line H3 is short, U there
The loss of the HF signal is very low. When the UHF signal amplified as described above is applied to the hot-side terminal E1, the UHF television signal is sent to the transmission line connected to the output terminal E.

When a VHF television signal is input to the VHF input terminal D, the signal is supplied to the input terminal 10 of the VHF amplifier circuit G from the hot side terminal D1 through the connection line H2. In this case, since the connection line H2 is arranged so as to bypass the UHF input terminal C, the transmission of the VHF television signal is performed by transmitting the UHF television signal from the UHF input terminal C to the input end 7 of the UHF amplifier circuit F. It has no adverse effect on communication. Further, since the frequency of the VHF signal itself passing through the connecting line H2 is relatively lower than that of UHF, it is less likely to be disturbed in the process of passing through the connecting line H2 and is given to the input terminal 10 in a good condition. The VHF television signal supplied to the input terminal 10 is output to the output terminal 11 through the members 15, 17, 18, 19, 20, 21, and 22. The signal is given to the hot side terminal E1 of the output terminal E through the connection line H3. As a result, the amplified VHF television signal is sent to the transmission line connected to the output terminal E.

By the above operation, the output terminal E
The television receiver connected to can receive both UHF and VHF television signals. In the above case, the FM having a high level is input to the VHF input terminal D.
A signal comes in and it is the above code 17, 18, 19, 20, 21, 22
In the case of interfering with the VHF television signal passing through the member of the FM filter 16, the FM filter changeover switch circuit 17 is used.
If the signal is switched to the side through which the signal is passed, the filter 16 can block the passage of the FM signal, and the interference can be removed.

In the above booster, since the UHF input terminal C and the output terminal E are provided at the positions as described above, the distance between them is the same as the input end 7 and the output end 8 in the UHF amplifier circuit F. It is equivalent to the interval. UH
In the F amplifier circuit F, the distance between the input end 7 and the output end 8 is set so that there is no high-frequency coupling between them, so that the UHF input terminal C and the output terminal E are inevitably connected. The distance between them is the necessary and sufficient isolation (eg −
A distance (for example, 90 mm) sufficient to obtain 60 dB is secured. Therefore, stable operation can be performed without causing oscillation due to coupling between the UHF input terminal C and the output terminal E.

Next, different uses of the booster will be described. For example, as in the case where the signal from the UHF antenna and the signal from the VHF antenna are mixed by a mixer, the UHF TV signal and the VHF TV signal are sent together by one transmission line. In that case, the transmission line is connected to the UHF input terminal C, and the input changeover switch circuit 15
Is switched to the side through which the signal from the low-pass filter 14 passes. In this state, the UHF television signal is output from the output terminal E as in the above case. on the other hand,
The VHF TV signal is the hot side terminal of the UHF input terminal C.
The auxiliary input terminal 13 enters from C1 through the connecting line H1. Then, it reaches the changeover switch circuit 15 through the low-pass filter 14, and thereafter, it is outputted from the output terminal E in the same manner as in the above case.

Next, FIG. 7 shows a different example of the VHF amplifier circuit, in which the VHF amplifier circuit is not provided with a structure for removing the FM signal.
It shows an amplifier circuit. In addition, for the parts which are functionally the same as or equivalent to those in the previous figure and are considered to be redundant, the same reference numerals as those in the previous figure are appended with the letter e, and the redundant description is omitted. (Also, in the following figures and the like, alphabetical letters f, g, and h are sequentially added in order to omit the duplicated explanation, based on the same idea.)

Next, FIG. 8 shows a further different example of the VHF amplifier circuit, and shows a VHF amplifier circuit which has only one input terminal 10f and which is connected to the filter circuit 18f by a transmission line 34.

FIG. 9 shows a different example of the VHF transmission circuit, which does not have an amplification function and outputs the incoming VHF signal as it is.
Reference numeral 35 denotes a transmission line that transmits a VHF signal with little loss.

FIG. 10 shows a VHF transmission circuit similar to that shown in FIG. 9, which has only one input terminal 10h.

[0023]

As described above, according to the present invention, since the UHF input terminal C, the VHF input terminal D, and the output terminal E are arranged in parallel on the one edge 3 of the substrate B,
When the substrate B is to be housed in a case in which the respective through holes of the VHF input or output transmission lines are collectively provided on one wall to ensure waterproofness, the above-mentioned wall B is placed on the wall side. There is an effect that each terminal can be positioned correspondingly.
In addition, the UHF signal and VHF are output to the output terminal E when in use.
Since both signals can be output, if a receiving device is connected thereto, both UHF and VHF signals can be arbitrarily used. Moreover, the UHF signal can be amplified and output even if the level input to the booster is low,
There is an effect that the UHF signal can be easily used. Further, in order to amplify and output the above UHF signal, UH
The UHF signal input to the F input terminal C is fed to the UHF amplifier circuit F
To the output terminal E or the UHF signal amplified by the UHF amplifier circuit F is transmitted to the output terminal E, the UHF amplifier circuit F
Since it is provided adjacent to the HF input terminal C and the output terminal E, there is an effect that any transmission distance is short and the loss of the UHF signal there can be extremely reduced. Further, the UHF input terminal C and the output terminal E are provided at one end and the other end of the edge portion 3, respectively.
Since they are arranged in 3a and 3b, a large gap can be formed between them and a large isolation can be obtained between them, and even if the gain of the UHF amplifier circuit F is high, U
There is an effect that oscillation due to the coupling between the HF input terminal C and the output terminal E is prevented and a stable operation is performed. Further, even if the distance between the UHF input terminal C and the output terminal E is increased to increase the isolation between them as described above, the VHF input terminal D is
Since it is arranged in the vacant space between the HF input terminal C and the output terminal E, it has the feature that it can be made compact and compact without any increase in the external form. Further, the UHF input terminal C, output terminal E and VH as described above
Even if the F input terminal D is arranged to be small and compact, the connection line H2 connecting the VHF input terminal D and the input terminal 10 of the VHF transmission circuit G is connected to the UHF input terminal C.
The UHF signal is transferred from the UHF input terminal C to the input end 7 of the UHF amplifier circuit F by V since
Can be performed without being affected by the HF signal, and
Even if the connection line H2 is a detour due to the above-mentioned detour, the VHF signal passing therethrough has a lower frequency than the UHF signal and is less likely to be interfered with, so it should be given to the VHF transmission circuit G in a good condition. Resulting in UHF signal and V
There is an effect that a high-quality signal can be output from the output terminal E together with the HF signal.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement relationship of various members in a booster.

FIG. 2 is a diagram showing a mechanical layout relationship of various circuits in a VHF amplifier circuit.

FIG. 3 is a diagram showing a mechanical layout relationship of various circuits in a UHF amplifier circuit.

FIG. 4 is a diagram showing a connection relationship of various members in the booster.

FIG. 5 is a block diagram showing an electrical connection relationship of various circuits in the VHF amplifier circuit.

FIG. 6 is a block diagram showing an electrical connection relationship of various circuits in the UHF amplifier circuit.

7A is a partial view showing a mechanical layout relationship of various circuits in a different example of a VHF amplifier circuit, and FIG. 7B is a block diagram showing an electrical connection relationship thereof.

FIG. 8A is a partial view showing a mechanical layout relationship of various circuits in a further different example of the VHF amplifier circuit, and FIG. 8B is a block diagram showing an electrical connection relationship thereof.

9A is a partial view showing a mechanical layout relationship of various circuits in a different example of a VHF transmission circuit, and FIG. 9B is a block diagram showing an electrical connection relationship thereof.

FIG. 10 is a partial view showing a mechanical layout relationship of various circuits in still another example of the VHF transmission circuit.

FIG. 11 is a diagram showing an arrangement relationship of various members in a conventional booster.

[Explanation of symbols]

 B board C UHF input terminal D VHF input terminal E output terminal F UHF amplifier circuit G VHF transmission circuit H1, H2, H3 connection line

Claims (1)

[Claims] 1. A UHF input terminal for inputting a UHF signal, a VHF input terminal for inputting a VHF signal, and an output terminal for outputting a UHF signal and a VHF signal at one edge of a substrate. And the UHF amplifier circuit and the VHF transmission circuit on the board, and the UHF amplifier circuit is located on the edge side where the terminals are provided.
The HF transmission circuit is arranged in a state of being located far from the edge, and between the UHF input terminal and the input end of the UHF amplifier circuit and between the output terminal and the output end of the UHF amplifier circuit, respectively. In the booster which is connected by a connecting line, the VHF input terminal and the input end of the VHF transmission circuit and the output terminal and the output end of the VHF transmission circuit are connected by a connection line. The connection line connecting between the VHF input terminal located between the UHF input terminal and the output terminal and the input end of the VHF transmission circuit is
In order to avoid giving an influence to the connecting line connecting the UHF input terminal and the input end of the UHF amplifier circuit, the above UHF
A booster characterized by bypassing the outside of the input terminal.