JPH01243701A - Fitting angle, method and device for reception sensitivity adjustment of bs antenna, and receiving surface shielding cover for bs antenna used for device concerned - Google Patents

Abstract

PURPOSE:To easily and correctly set an elevation angle and an azimuth, and to correctly set a receiving sensitivity even under a bad weather conditions by placing a shielding cover over the receiving surface of a BS antenna, attenuating a transmitting radio wave with the shielding cover, and adjusting the elevation angle, azimuth, and receiving sensitivity of the antenna. CONSTITUTION:A parabolic antenna 1 is constituted being equipped with a reflector 2 formed by a parabolic conductor, and a converter 3 is provided on the focus position of the paraboloid of the reflector 2. The converter 3 is supported with an arm 4, fitted to an antenna fitting adjusting tool 5, and the adjusting tool 5 is attached on a pole 6. A shielding cover 7 is fitted in front of the reflector 2 so as to cover the converter 3, and it is constituted so as to be attachable and detachable to the reflector 2. The cover 7 consists of a plastic film, a cloth, paper, and composite materials of them, it completely covers the receiving surface of the antenna 1, and attenuates the transmitted radio wave by 2-10dB.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for adjusting BS antennas such as parabolic antennas and planar antennas, and in particular allows anyone to easily and quickly set the azimuth and elevation angles of the BS antenna, and moreover, it can be used on cloudy days under bad weather conditions. A BS antenna installation angle, a method for adjusting reception sensitivity, a device therefor, and a reception BS antenna used in the device that can more accurately set the reception sensitivity so that a good reception screen similar to that on a clear day can be obtained even during rain or snowfall. This invention relates to a surface shielding cover.

[Conventional technology]

Generally, frequency ranges are divided into various frequency bands according to the Radio Law Enforcement Regulations (Article 4-3). That is, the HF frequency band (3 MHz to 30 MHz) of AM, FM, etc., which is the radio wave used for radio broadcasting.
Hz), the VHF frequency band (30MHz to 300MHz), which is the radio wave used for television broadcasting.
Hz), and the UHF frequency band (300 MHz to 3 GHz), which is a radio wave for space communication (satellite communication).
), S HF frequency band (3 GHz to 30 GHz), etc. Among these, NHK and commercial television broadcasts use radio waves in the VHF frequency band because they can increase the radio wave output, and terrestrial broadcasting with analog signals. Broadcasts are carried out from the station to all over the country via relay stations in various places. Radio waves in the VHF frequency band are directional, and because of this directivity, Yagi antennas with 8 elements, 10 elements, 12 elements, etc. are conventionally used to receive radio waves in the VHF frequency band. This Yagi antenna consists of several rod-shaped elements of about half a wavelength arranged in a row, and only the elements inside are fed power, while the other elements are radiatively coupled to each other so that a resonant current flows.
In order to change the magnitude and phase of each current, the length and spacing of the elements are adjusted to provide good directivity. The number of elements in this antenna (antenna) has the function of increasing the gain by increasing the number of elements. In addition, local stations use the UHF frequency band, which has high attenuation and cannot reach long distances. In recent years, many modern high-rise buildings have been constructed around cities, and these high-rise buildings are causing a lot of radio interference. In other words, radio waves in this VHF frequency band have good directionality, and because they are emitted from a ground-based transmitting station, they cannot be transmitted by antennas (
There is no problem if there are no obstacles such as high-rise buildings around the VHF antenna, but if there are obstacles such as high-rise buildings around this VHF antenna, radio waves may be transmitted to the high-rise buildings or other obstacles. This reflected radio wave is inputted from the VHF antenna with a phase delay, so it appears as a so-called ghost on the television screen, resulting in an ugly image. In particular, if there is an obstacle such as a high-rise building in the direction of the source of the TV signal, the radio waves in the VHF frequency band are directional, and since the radio waves are emitted from the transmitting station on the ground, the high-rise building etc. The radio waves are obstructed by the obstacles in the VHF antenna, and the radio waves do not enter the VHF antenna properly, resulting in a situation where only radio waves that come around behind obstacles such as high-rise buildings can be received. As a result, the television screen becomes distorted and normal playback is no longer possible. In order to eliminate such radio wave interference, attempts have recently been made to launch a geostationary satellite for satellite broadcasting into space and perform television broadcasting using this geostationary satellite for satellite broadcasting. The output from this geostationary satellite for satellite broadcasting is small because it is transmitted using electricity obtained using solar cells, but P C
M (Pulse Code Modulation)
Because it is transmitted as a digital signal from a geostationary satellite toward the earth using a satellite broadcasting method, there is no radio interference caused by obstacles such as high-rise buildings, and the reflector is made of a parabolic conductor.
Even if the transmission output is small, it can be covered by using a parabolic antenna as shown in FIG. 3 with an antenna placed at the focal point. Furthermore, even if a flat antenna as shown in Fig. 4, which receives radio waves transmitted from a geostationary satellite towards the earth from a geostationary satellite for satellite broadcasting on a flat surface with a large receiving area, is used, it is possible to cover even if the transmission output is small, similar to a parabolic antenna. Can be done. This type of S antenna has very sharp directivity characteristics, and the half-value angle (the angle used to express the directivity of the antenna), expressed as the angle from the direction of maximum directivity to the direction in which the power is reduced to half, is As shown in Figure 5, it is about 2°. Therefore, in order to receive BS broadcasts in the best condition, it is important to correctly set the direction of the BS antenna in the direction of the maximum directivity of the radio waves transmitted from the geostationary satellite for satellite broadcasting. Therefore, the BS antenna adjusts its elevation angle as shown in FIG. 6 and its azimuth angle as shown in FIG. 7 so that it directly faces the broadcasting satellite that is emitting television radio waves based on digital signals. That is, the azimuth angle of the BS antenna is determined to point toward the direction in which the geostationary satellite for satellite broadcasting is located, and the elevation angle of the BS antenna is determined to be directed toward the direction in which the geostationary satellite for satellite broadcasting is located. In addition, the power obtained using solar cells can be used to transmit PCM (Pulse Code
M. The output of the radio waves that are output as digital signals using the Duration ) method is small, so if there are many clouds or raindrops or snow falls, the radio waves transmitted from the geostationary satellite for satellite broadcasting will be affected by these clouds. It is attenuated by being absorbed or scattered by raindrops, snow, etc. Therefore, when installing a BS antenna, if you install it on a clear day and set the reception sensitivity state of the BS antenna in the reception state under clear weather, the reception screen will be This causes so-called flickering and rainy conditions, making it impossible to receive BS broadcasts in good conditions. The conventional BS antenna adjustment method is to install the BS antenna on a sunny day using a roof horse, for example, and adjust the direction of the BS antenna in order to receive BS broadcasts in the best condition. In order to correctly set the direction of the maximum directivity of the radio waves emitted from the geostationary satellite for satellite broadcasting, turn the BS antenna a few degrees in the azimuth direction toward the direction where the geostationary satellite for satellite broadcasting is located. Find the direction in which the sensitivity is maximum, set the azimuth in that direction, and then move the elevation angle of the BS antenna several degrees in the direction of elevation toward the direction where the geostationary satellite for satellite broadcasting is located, in the direction in which the sensitivity is maximum. is found, the elevation angle is determined in that direction, and the receiving sensitivity state of the BS antenna is set in the receiving state in clear weather. [Problem to be Solved by the Invention 1] As described above, it is difficult to install a BS antenna by climbing on the roof in bad weather such as rain or adjusting the direction of the BS antenna. If the roof slips due to rain or other reasons, it is not possible to do so due to work efficiency and safety concerns, and the azimuth direction of the BS antenna is determined by moving the direction of the BS antenna in the direction where the sensitivity is maximized under the condition of reception sensitivity in clear weather. At the same time, the elevation angle of the BS antenna is determined by moving the direction of the BS antenna in the direction where the sensitivity is maximized, and fine adjustment of the antenna is performed. For this reason, in the conventional BS antenna adjustment method, even though the half-power angle (the angle used to express the directivity of the antenna) is as small as about 2", the BS antenna is Because the azimuth and elevation angles of The problem is that the direction of the BS antenna cannot be set correctly in the direction of the maximum directivity.If the direction of the BS antenna is not set correctly in the direction of the maximum directivity within this half-value angle, the BS antenna will In the case of broadcast reception, the antenna gain is attenuated by several dB depending on the intensity of the rain, so if the antenna is bent at a certain angle from the direction of maximum directivity, the attenuation of the antenna gain is doubled, causing problems such as cloudy, rainy, snowy weather, etc. On days of bad weather, the radio waves transmitted from geostationary satellites for satellite broadcasting are attenuated, causing so-called flickering and rain conditions on the receiving screen, making it impossible to receive BS broadcasts in good conditions. In addition, with the conventional BS antenna adjustment method, when receiving BS broadcasts during rain, the antenna gain is attenuated by several dB depending on the intensity of the rain. Climbing onto the roof in bad weather such as
Adjustment of the antenna is not done due to the efficiency and safety of work due to slipping on the roof due to rain, etc., and because the reception sensitivity of the BS antenna is set based on the reception condition in clear weather, it is not necessary to adjust the antenna on cloudy or rainy days. On days of bad weather such as snow, the radio waves transmitted from geostationary satellites for satellite broadcasting are attenuated, causing
This has caused problems such as so-called flickering and rainy conditions, making it impossible to receive BS broadcasts in good conditions. The present invention has been made in view of these problems of the conventional technology, and its purpose is to enable anyone to easily and quickly determine the azimuth and elevation angles of a BS antenna such as a parabolic antenna or a planar antenna. , and can be set accurately, and the BS antenna mounting angle allows the reception sensitivity to be set more accurately so that even in bad weather conditions such as cloudy, rainy, or snowy conditions, you can obtain a reception screen as good as on a clear day. The present invention aims to provide a receiving sensitivity adjustment method, a device thereof, and a shielding cover for the receiving surface of a BS antenna used in the device.

[Means for solving the problem 1] In order to achieve the above object, the BS antenna installation angle and reception sensitivity adjustment method in the present invention covers the receiving surface of the BS antenna with a shielding cover, and the shielding cover attenuates the transmitted radio waves. This is to adjust the elevation angle, azimuth angle, and receiving sensitivity of the BS antenna. The shielding cover placed over the receiving surface of the BS antenna is preferably made of plastic film, cloth, paper, or a composite material thereof. Similarly, the BS antenna installation angle and reception sensitivity adjustment device of the present invention includes a shielding cover that completely covers the reception surface of the BS antenna, and the shielding cover attenuates the transmitted radio waves to adjust the reception sensitivity according to the orientation of the BS antenna. The azimuth and elevation angle of the BS antenna are adjusted based on the reception intensity received by the reception surface of the BS antenna, and the reception sensitivity of the BS antenna during rain or snowfall is adjusted. The shielding cover placed over the receiving surface of the BS antenna is preferably made of plastic film, cloth, paper, or a composite material thereof. Furthermore, the shielding cover for the receiving surface of the BS antenna that attenuates the transmitted radio waves completely covers the receiving surface of the BS antenna.
This attenuates the radio waves transmitted to the station by 2 to 10 dB. The shielding cover placed over the receiving surface of the BS antenna is preferably made of plastic film, cloth, paper, or a composite material thereof. [Operation] As mentioned above, cover the receiving surface of the BS antenna with a shielding cover that completely covers the receiving surface, and block the radio waves transmitted to the receiving surface by 2 to 10 d.
The azimuth angle and elevation angle of the BS antenna are adjusted based on the reception intensity received by the reception surface of the BS antenna according to the orientation of the BS antenna, and the reception sensitivity of the BS antenna during rain or snowfall is adjusted. This artificial attenuation of the radio waves transmitted to the receiving surface affects the reception condition of radio waves on bad weather such as cloudy, rainy, or snowy days, and changes the azimuth and elevation angle of the BS antenna such as a parabolic antenna or a flat antenna. To contribute to more accurate setting of reception sensitivity so that anyone can easily set it quickly and accurately, and even in bad weather conditions such as cloudy, rainy or snowy, a good reception screen can be obtained as in the case of clear weather.

【Example】

Examples of the present invention will be described below. FIG. 1 shows an embodiment of the present invention. FIG. 1 shows a method of adjusting the mounting angle and reception sensitivity of a BS antenna according to the present invention, a device therefor, and a shielding cover for a reception surface of a BS antenna used in the device applied to a parabolic antenna. In the figure, a parabolic antenna 1 has a reflector 2 formed of a parabolic conductor, as also shown in FIG.
A converter 3 is provided at the focal point of the paraboloid of this reflector 2. This converter 3 is supported by an arm 4 and attached to an antenna attachment adjustment tool 5. This antenna mounting adjustment tool 5 is attached to a pole 6. Further, a shielding cover 7 is attached to the front of the reflector 2 of the parabolic antenna 1 so as to surround the converter 3. This shielding cover 7 completely covers the receiving surface of the parabolic antenna 1 as shown in FIG. 1, and attenuates the radio waves transmitted to the receiving surface by 2 to 1 oclB. It is composed of materials, etc. This shielding cover 7 is configured to be detachable from the reflector 2, which is the receiving surface of the parabolic antenna 1. FIG. 2 shows another embodiment of the invention. FIG. 2 shows a method of adjusting the mounting angle and reception sensitivity of a BS antenna according to the present invention, a device therefor, and a shielding cover for a reception surface of a BS antenna used in the device applied to a flat antenna. In the figure, a planar antenna 10 has a planar conductor 11 as shown in FIG. 12 are strung out. This antenna (antenna) 12 is designed so that a received signal can be taken out from the back side of the conductor 11. Also, this conductor 1
An antenna attachment adjustment tool 14 for attaching the planar antenna 10 to a pole 13 or the like is attached to the back side of the antenna 1 . In addition, in front of the planar conductor 11 of the planar antenna 10, a shield is placed on the planar conductor 11 to wrap around an antenna (antenna) 12 that is attached to the planar conductor 11 or embedded inside the planar conductor 11. A cover 15 is attached. This shielding cover 15 completely covers the receiving surface of the planar antenna 10 as shown in FIG. 2, and attenuates the radio waves transmitted to the receiving surface by 2 to 10 dB. It is composed of materials, etc. This shielding cover 15 is configured to be detachable from the conductor 11 which is the receiving surface of the planar antenna 10.

【Effect of the invention】

Since the present invention is configured as described above, it produces the effects described below. In the BS antenna installation angle and reception sensitivity adjustment method of claim 1, the reception surface of the BS antenna is covered with a shielding cover,
The shielding cover attenuates the transmitted radio waves, and the BS
Since it adjusts the elevation angle, azimuth angle, and reception sensitivity of the antenna, anyone can easily and accurately set the azimuth angle and elevation angle of a BS antenna such as a parabolic antenna or a planar antenna, and it also allows you to easily set the azimuth angle and elevation angle according to weather conditions. bad cloudy skies,
The reception sensitivity can be set more accurately so that a good reception screen can be obtained even when it is raining or snowing as when it is a sunny day. In the BS antenna installation angle and reception sensitivity adjustment method of claim 2, since the shielding cover for the reception surface of the BS antenna is made of plastic film, cloth, paper, or a composite material thereof, it is possible to attenuate the transmitted radio waves to the extent of a rain effect. can. In the BS antenna installation angle and reception sensitivity adjustment device according to claim 3, a shielding cover is provided that completely covers the receiving surfaces of the B and S antennas, and the transmitted radio waves are attenuated by the shielding cover, so that the transmitting radio waves can be adjusted according to the direction of the BS antenna. The azimuth and elevation angle of the BS antenna are adjusted based on the reception intensity received by the receiving surface of the BS antenna, and the reception sensitivity of the BS antenna during rain or snowfall is adjusted. Anyone can easily set the azimuth and elevation angles more quickly and accurately, and the receiver sensitivity can be improved so that even in bad weather conditions such as cloudy, rainy, or snowy conditions, you can obtain a reception screen as good as in clear weather. Can be set accurately. In the BS antenna installation angle and reception sensitivity adjustment device of claim 4, since the shielding cover for the reception surface of the BS antenna is made of a plastic film, a sheet of cloth, or a composite material thereof, it is possible to attenuate the transmitted radio waves to the extent of a rain effect. can. The shielding cover for the receiving surface of the BS antenna of claim 5 completely covers the receiving surface of the BS antenna and attenuates the radio waves transmitted to the receiving surface by 2 to 10 dB. Anyone can easily and accurately set the azimuth and elevation of the antenna, and the reception sensitivity has been improved so that even in bad weather conditions such as cloudy, rainy, or snowy conditions, you can obtain a reception screen as good as in clear weather. can be set more accurately. In the shielding cover for the receiving surface of the BS antenna according to claim 6, since the shielding cover for the receiving surface of the BS antenna is made of plastic film, cloth, paper, or a composite material thereof, the transmitted radio waves can be reliably affected by a rainfall effect of 2 to 10 dB. can be attenuated to

[Brief explanation of the drawing]

Fig. 1 is an overall view showing an embodiment of the present invention, Fig. 2 is an overall view showing another embodiment of the invention, Fig. 3 is an overall perspective view of a commonly used parabolic antenna, and Fig. 4 is an overall view showing an embodiment of the present invention. An overall perspective view of a commonly used planar antenna, Figure 5 is BS
Figure 6 is a diagram for explaining the half-power angle of the antenna, Figure 6 is a diagram for explaining the elevation angle direction of BS antenna adjustment, Figure 7 is B
FIG. 3 is a diagram for explaining the azimuth direction of S antenna adjustment.

Claims (6)

[Claims] (1) A method for adjusting the mounting angle and receiving sensitivity of the BS antenna, in which the receiving surface of the BS antenna is covered with a shielding cover, the transmitting radio waves are attenuated by the shielding cover, and the elevation angle, azimuth angle, and receiving sensitivity of the BS antenna are adjusted. (2) The method for adjusting the mounting angle and reception sensitivity of the BS antenna according to claim 1, wherein the shielding cover for the receiving surface of the BS antenna is made of plastic film, cloth, paper, or a composite material thereof. (3) Provide a shielding cover that completely covers the receiving surface of the BS antenna, attenuate the transmitted radio waves with the shielding cover, and
BS antenna mounting angle and reception sensitivity that adjust the azimuth and elevation angle of the BS antenna based on the reception intensity received by the reception surface of the BS antenna according to the orientation of the S antenna, and adjust the reception sensitivity of the BS antenna during rain or snowfall. Adjustment device. (4) The BS antenna mounting angle and reception sensitivity adjusting device according to claim 3, wherein the shielding cover for the receiving surface of the BS antenna is made of plastic film, cloth, paper, or a composite material thereof. (5) A shielding cover for the receiving surface of the BS antenna that completely covers the receiving surface of the BS antenna and attenuates the radio waves transmitted to the receiving surface by 2 to 10 dB. (6) The shielding cover for the receiving surface of the BS antenna according to claim 5, wherein the shielding cover for the receiving surface of the BS antenna is made of a plastic film, cloth, paper, or a composite material thereof.