JPH01221087A - Transmission line equipment for reception - Google Patents

Abstract

PURPOSE:To reduce the reflection of a reception signal at a receiver and to suppress the occurrence of a standing wave by inserting an attenuator into the output end part of a power supply line to attenuate a reception signal. CONSTITUTION:A satellite broadcasting wave received by a parabolic antenna 1 is amplified in a converter 2 and converted to a low frequency, then transmitted to a transmission line equipment 21 for reception. The equipment 21 is constituted of a water-proof connector 3, a power supply line 22 having a length of 10-20m suitable for use in homes, the attenuator 23 inserted into the output end part of the line 22, and a connector 5. In such a constitution, a satellite broadcasting signal received through the antenna 1 and the converter 2 is attenuated to a signal level equal to that in case of using a power supply line 4 in a standard length 30m by the line 22 and the attenuator 23, thereafter, transmitted to a receiver 7 via a connector 7. By thus attenuating a reception signal, the reflecting of a reception signal at the receiver 7 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a reception transmission line device, and is suitable for application to a reception transmission line device of a reception system that receives satellite broadcasting, for example.

B Summary of the Invention The present invention provides a receiving transmission line device in which an attenuation device is inserted at the output end of a feeder line to attenuate the received signal, thereby reducing the reflection of the received signal in the receiving device and making it stable. A reception transmission line device that can suppress the generation of waves can be realized.

C. Prior Art Conventionally, for example, in transmission line devices for general home reception systems for satellite broadcasting, it has been standardized to increase the length of the feeder line to increase the amount of attenuation of the transmitted signal.

That is, as shown in FIG. 2, in the receiving system 10, the F
The converter 2 amplifies the satellite broadcast wave consisting of M microwaves (12 (GHz)) and converts it to a low frequency (1 (GHz)
)), and then sent to a reception transmission line device 6 consisting of a waterproof connector 3, a feeder line 4, and a connector 5.

The power supply line 4 has a standard length of 30 (m), and after transmitting the satellite broadcast reception signal, it is attenuated to a predetermined signal level and then installed indoors via the connector 5. input to the receiving device 7.

In this way, the received signal is attenuated to the extent that the S/N ratio does not deteriorate compared to the case where a feed line shorter than the standard length (30 (m)) (that is, a feed line with low attenuation) is used. can be input to the receiving device 7, reducing the reflection of the received signal in the receiving device 7, and attenuating the reflected waves generated at the position of the connector 5, thereby preventing the generation of standing waves in the feeder line 4. By being able to suppress this in advance, it is possible to stably receive satellite broadcast wave signals.

D Problems to be Solved by the Invention However, when this type of reception transmission line device is used for general household use, the length of the feeder line is practically 10 to 20 (m).
If you try to use a standard length (30 (m)) feeder line, you will have to bundle up the excess length and leave it alone. There was a problem that standing waves were generated and the received signal deteriorated.

The present invention has been made in consideration of the above points, and aims to propose a reception transmission line device that can effectively suppress the generation of standing waves even when using a short feeder line.

Means for Solving Problem E - In order to solve this problem, the present invention provides a receiving transmission line device that transmits the output signal of the converter 2 provided near the antenna 1 to the receiving device 7 through the feeder line 22. 21, a damping device 23 is inserted at the output end of the feeder line 22 to suppress the generation of standing waves.

By interposing the attenuation device 123 at the output end of the F-action feeder line 22 and attenuating the received signal, reflection of the received signal at the receiving device 7 can be reduced, thereby suppressing the generation of standing waves. Can be done.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG. Send.

The reception transmission line device 21 includes a waterproof connector 3, a feeder line 22 having a length suitable for general household use (10 to 20 (m)), and an attenuation device 23 inserted into the output end of the feeder line 22. and a connector 5, and when it receives a satellite broadcast reception signal, it is transmitted through the feeder line 22 while being attenuated, and the attenuation device 23 also attenuates it to a predetermined level, thereby reducing overall attenuation. It is configured to output the signal to the receiving device 7 with the amount (that is, insertion loss) equivalent to that when using a standard length feeder line.

For example, since the insertion loss in a standard length (30 m) feeder line is 12 to 15 (dB),
) is used, the attenuation device 23 is 6 (
dB).

In addition, when using a 20 (m) feeder line, the attenuation device 23
3 (dB) of attenuation is selected for reception.

In this way, the entire transmission line between the converter 2 and the receiver 7 can have the same insertion loss as when using the standard length feeder line 4.

In the above configuration, the satellite broadcast reception signal received via the parabolic antenna 1 and the converter 2 is transmitted to the feeder line 2.
2 and the attenuation device 23 to the same signal level as when using the standard length feeder line 4, and then the connector 5
is sent to the receiving device 7 via.

By attenuating the received signal in this manner, reflection of the received signal at the receiving device 7 can be reduced.

According to the above configuration, the attenuation amount of the attenuation device 23 can be selected to the optimum value according to the length of the power supply and %I22, so that
The insertion loss of the entire receiving transmission line device 21 can be made equal to that when a standard length feeder line 4 is used, and the generation of standing waves can thus be effectively suppressed, thereby preventing deterioration of the received signal. Can be done.

Furthermore, by being able to match the level of the received signal sent to the receiving device 7 with the conventional level, the conventional It can also be used as a receiving device.

In addition, in the above-mentioned embodiment, a case was described in which a 10 (m) and 20 (m) feeder line was used as a reception transmission line device for general household use, but the present invention is not limited to this. (m) or less in length can also be used.

Further, in the above-described embodiments, the case where the present invention is applied when receiving satellite broadcasting is described, but the same effect can be obtained even when the present invention is applied when receiving other microwave signals.

Effects of the Invention As described above, according to the present invention, by inserting an attenuation device on the output end side of the feeder line, it is possible to effectively reduce the generation of reflected waves, thus reducing the generation of standing waves. By suppressing this, it is possible to realize a receiving transmission line device that can prevent deterioration of the received signal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing the configuration of a conventional receiving system. 1... Parabolic antenna, 2... Converter, 3.5... Connector, 4.22...
...Feeding line, 6.21... Transmission line device for reception, 7... Receiving device, 10.20...
Receiving system, 23...attenuation device.

Claims (1)

[Scope of Claim] In a receiving transmission line device that transmits an output signal of a converter provided near an antenna to a receiving device through a feed line, a stationary transmission line device is provided by inserting an attenuator at the output end of the feed line. A receiving transmission line device characterized by suppressing the generation of waves.