JPH02266616A - Bs converter - Google Patents

Abstract

PURPOSE:To send a satellite broadcast reception signal, a VHF reception signal and a UHF reception signal through one coaxial cable by connecting a synthesizer synthesizing a VHF-UHF band reception signal with an intermediate frequency signal at a post-stage than a frequency conversion circuit and incorporating the synthesizer in a case. CONSTITUTION:A synthesizer 10 connects to a post-stage of a 1st intermediate frequency amplifier circuit 8 comprising amplifiers 8a8c. The synthesizer 10 is contained in a single case to constitute a BS converter together with amplifiers 2, 3, a frequency converter circuit 6, a local oscillating circuit 7 and an intermediate frequency amplifier circuit 8. Thus, reception signals of 3 kinds of broadcast, a satellite broadcast, a VHF broadcast and a UHF broadcast are sent through a single coaxial cable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a BS converter placed near a satellite broadcast receiving antenna.

[Conventional technology]

Satellite broadcast radio waves are in the 12GH2 band, so if the signal received by a BS antenna is brought indoors via a coaxial cable, the amount of attenuation will be very large (this is why conventionally, the signal received by a BS antenna is 1GH signal
The BS converter that converts the Z-band first intermediate frequency signal is B.
A configuration in which it is connected near the S antenna is adopted.

FIG. 2 shows a block diagram of the configuration of a conventional BS converter. A signal in the 12 GHz band is input from the BS antenna 1, is amplified by the first and second amplifiers 2.3 using high electron mobility transistors (I (EMT)) using heterojunction GaAs, and is sent to the output terminal. A frequency conversion circuit 6 consisting of a high frequency filter 4 and a mixer 5 is connected to this output side.

A local oscillation circuit 7 that provides a local oscillation frequency for frequency conversion is connected to the mixer 5.

The mixer 5 outputs the output signal of the filter 4 and the local oscillation circuit 7.
The difference between the local oscillation frequency signal given by I
A first intermediate frequency signal in the GHz band is output. Note that 8 indicates a first intermediate frequency amplification circuit, which includes multiple stages of amplifiers 8a to 8.
It is composed of C.

The BS converter configured as described above needs to be placed near the BS antenna 1. Therefore, it is built into a case that has excellent environmental resistance such as moisture resistance.

[Technical Problem to be Solved by the Invention] By using the above BS converter, a signal input from an antenna is transmitted to a BS tuner via a coaxial cable in the form of a first intermediate frequency signal in a 10 Hz band.

On the other hand, signals received by VHF antennas and UHF antennas are transmitted to a tuner or television receiver using a coaxial cable separate from the coaxial cable for transmitting satellite broadcast reception signals.

Therefore, conventionally, two systems for satellite broadcasting and VHF-UHF
Coaxial cables had to be run from each antenna installed on the roof or roof to the indoor tuner or TV receiver.

Therefore, it is necessary to route multiple coaxial cables, resulting in high cable costs.

In addition, since two coaxial cables with relatively large diameters are drawn in, a relatively large space is required for drawing in and wiring, and if multiple coaxial cables with relatively large diameters are stretched along a wall, etc. There was also the problem of spoiling the aesthetics of the interior.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a BS converter that makes it possible to transport an Ll (F-UHF reception signal) along with a first intermediate frequency signal of a satellite broadcast reception signal through the same coaxial cable.

[Means for solving technical problems]

The BS converter of the present invention includes a first amplification circuit that amplifies a signal received by a BS antenna, a frequency conversion circuit that converts an output signal of the first amplification circuit into an intermediate frequency signal, and a frequency conversion circuit that converts the output signal of the first amplification circuit into an intermediate frequency signal. In a case that includes a local oscillation circuit that provides a local oscillation frequency signal during conversion and an intermediate frequency amplification circuit that amplifies the intermediate frequency signal provided from the frequency conversion circuit, the signal received by the VHF and UHF antenna. The BS converter is characterized in that a synthesizer for synthesizing the above-mentioned intermediate frequency signal and the above-mentioned intermediate frequency signal is connected at a stage subsequent to the above-mentioned frequency conversion circuit and is housed in the same case.

[Effect]

The satellite broadcast reception signal input from the BS antenna is
The signal is amplified by the amplifier circuit, frequency-converted by the frequency conversion circuit, and provided to the intermediate frequency amplifier circuit as an intermediate frequency signal. In the intermediate frequency amplifier circuit, this intermediate frequency signal is amplified and output.

On the other hand, in the present invention, the VHF-UHF signal is combined with the intermediate frequency signal in the combiner. Since this synthesizer is connected after the frequency conversion circuit and is built in the same case, the BS converter of the present invention outputs a signal in which the intermediate frequency signal and the VHF-UHF reception signal are synthesized. That will happen. Therefore, three types of received signals can be transmitted by simply connecting the BS converter and an indoor tuner or television receiver using a single coaxial cable.

[Explanation of Examples]

FIG. 1 is a schematic block diagram of a BS converter according to an embodiment of the present invention. Components that are the same as those of the conventional BS converter shown in FIG. 2 will be given the same reference numerals, and a description thereof will be omitted.

A feature of this embodiment is that a synthesizer 10 is connected to the rear stage of the first intermediate frequency amplification circuit 8 made up of amplifiers 88 to 8C. This synthesizer 10 is housed in a single case together with amplifiers 2 and 3, a frequency conversion circuit 6, a local oscillation circuit 7, and an intermediate frequency amplification circuit 8 to constitute the BS converter of this embodiment.

Synthesizer 10c), one input end 10a is given an intermediate frequency signal output from an intermediate frequency amplifier circuit, the other input end 10b is connected to a VHF-UHF antenna or a VHF antenna.
U mixer (not shown) that mixes the signal and UHF signal
The VHF-UHF reception signal is input.

The synthesizer lO synthesizes this VHF-LIHF received signal and the first intermediate frequency amplified signal of the satellite broadcast, and outputs the signal at the output terminal 10c.
Output from

Therefore, by connecting one coaxial cable to the output side of the BS converter of this embodiment and connecting the other end of the coaxial cable to a tuner or television receiver indoors via a distributor, satellite broadcasting, VHF broadcasting and LIH
The reception signals of three types of F broadcasts can be transmitted through a single coaxial cable.

In the above embodiment, the synthesizer 10 was connected to the downstream stage of the intermediate frequency amplification circuit 8, but it may be connected to any position downstream of the frequency conversion circuit 6. As shown in FIG. 3, the mixer 10 may be connected between amplifiers 8a and 8b of the intermediate frequency amplification circuit 8,
Alternatively, it may be connected before the amplifier 8a or at other locations.

In this way, when the mixer 10 is connected in the middle of the intermediate frequency amplification circuit 8 or at the front stage, the vIiF-UHF received signal is mixed with the intermediate frequency signal and amplified in the amplifier. Therefore, the amplifiers 8a to 8 of the intermediate frequency amplification circuit 8 serve as boosters for VHF-UHF signals.
8C can be used, and it is also possible to increase the reception level of the VHF-UHF band.

Next, the specific structure of the BS converter of the embodiment shown in FIG. 1 will be explained with reference to FIG. 4. FIG. 4 is a schematic plan view showing the circuit configuration on the board housed in the case of the BS converter of the above embodiment.

A conductive pattern indicated by diagonal hatching is formed on the circuit board ll. In Figure 4, the dashed line A
The area surrounded by indicates the part where the DC-DC converter for supplying power to this converter is configured.
Further, although not particularly shown in the drawings, a frequency conversion circuit 6 and high frequency amplifiers 2 and 3 connected to the preceding stage thereof are configured on the lower surface side.

In addition, in the area surrounded by the - dotted chain line B, a three-stage amplifier 88
An intermediate frequency amplification circuit 8 consisting of ~8C is configured.

A synthesizer lO is configured in a region surrounded by a dashed line C. In the structure shown in FIG. 4, the synthesizer 10 is constructed using a transformer using a ferrite core and a balun 12.

For comparison, FIG. 5 shows a plan view of the circuit board in the BS converter in the conventional example shown in FIG. 2. As is clear from the comparison between FIGS. Since the IO can be configured in an extremely narrow space on the circuit board 11, even when the synthesizer IO is mounted on the board, the size of the circuit board of the BS converter, and by extension the size of the entire device, is not very large. I know it won't get bigger.

Although FIG. 4 shows a synthesizer 10 consisting of a transformer using a ferrite core and a balun 12, B of the present invention
As the combiner built into the S converter, various other structures can be used.

For example, as shown in FIG. 6(a), the entire lower surface (not shown) of a dielectric substrate 21 is covered with a ground electrode, and a conductive pattern 24 having branch portions 22 and 23 is formed on the upper surface side. Alternatively, as shown in FIG. 6(b), a synthesizer may be used in which conductive parts 27 and 28 are formed on one side of a dielectric substrate 25 with a predetermined gap 26 in between. .

〔Effect of the invention〕

As described above, according to the present invention, a synthesizer for synthesizing a VHF-UHF band received signal with an intermediate frequency signal is connected at a stage subsequent to the frequency conversion circuit, and is built in the same case. By using a coaxial cable, satellite broadcast reception signals, VHF reception signals and UHF
Three types of received signals can be transmitted indoors.

Therefore, the cable cost can be drastically reduced, and the wiring and routing of the coaxial cable can be simplified, so that the indoor aesthetics will not be spoiled when receiving satellite broadcasting.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a BS converter according to an embodiment of the present invention, FIG. 2 is a schematic block diagram of a conventional BS converter, and FIG. 3 is a schematic block diagram of a BS converter according to another embodiment of the present invention. FIG. 4 is a plan view for explaining the specific structure of the embodiment shown in FIG. 1, FIG. 5 is a plan view for explaining the specific structure of the conventional BS converter, and FIG.
a) and (b) are respective perspective views for explaining modified examples of the synthesizer. In the figure, 2 and 3 are amplifiers, 6 is a frequency conversion circuit, and 7 is an amplifier.
8 represents a local oscillation circuit, 8 represents an intermediate frequency amplification circuit, and 10 represents a synthesizer. Figure 1

Claims (1)

[Scope of Claims] A first amplification circuit that amplifies a signal received by a BS antenna; a frequency conversion circuit that frequency-converts the output signal of the first amplification circuit and outputs an intermediate frequency signal; A BS converter that is equipped in a case with a local oscillation circuit that provides a local oscillation frequency signal for use in frequency conversion to a frequency conversion circuit, and an intermediate frequency amplification circuit that amplifies an intermediate frequency signal output from the frequency conversion circuit. A BS converter characterized in that a synthesizer for synthesizing a signal input from an antenna and the intermediate frequency signal is connected at a stage subsequent to the frequency conversion circuit and is built in the same case. .