JPH02112302A - Antenna regulating device for satellite broadcasting - Google Patents

Abstract

PURPOSE:To allow a single person to easily regulate the set angle of an antenna even when a tuner is separated from the antenna by converting a signal outputted according to the signal level of the received signal into a low frequency signal, and outputting an FM high frequency signal FM-modulated with the low frequency signal. CONSTITUTION:To a reception circuit 13, which outputs the level signal according to the level of the reception signal from a satellite broadcasting antenna 3, a voltage/frequency converting circuit 17, which converts the signal to the low frequency signal according to the level, is connected. Further, an FM transmission circuit 25, which oscillates a high frequency signal and outputs the FM high frequency signal FM-modulated by the low frequency signal, is connected to the voltage/frequency converting circuit 17. When the output of the FM transmitting circuit 25 is connected to an antenna circuit system, the FM high frequency signal is outputted from the vicinity of the satellite broadcasting antenna 3. Thus, even when the satellite broadcast transmission and reception tuner is separate from the antenna 3, the set angle of the antenna 3 can be easily regulated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in satellite broadcasting antenna adjustment devices.

[Conventional Technique*] To receive satellite broadcasting in good image condition, it is necessary to orient the satellite broadcasting antenna, such as a parabolic antenna, in the southwest direction where the broadcasting satellite is located, and to accurately adjust the elevation and azimuth angles, which vary depending on the region. need to be adjusted.

Conventionally, in order to accurately adjust the direction of a parabolic antenna toward a broadcasting satellite, attention was paid to the fact that the AGC signal from the FM detection circuit of a satellite broadcast reception tuner changes depending on the received signal, and the AGC terminal of the FM detection circuit was Connect a level checker to the antenna and accurately adjust the elevation and azimuth angles of the parabolic antenna so that the value of the level checker is maximized.

The ΔGC voltage detection method is well known.

The same applies not only to parabolic antennas but also to other satellite broadcast antennas.

[Problem to be solved by the invention] However, in order to adjust the installation angle of the parabolic antenna using such an AGC voltage detection method, it is necessary to visually check the level checker connected to the AGC terminal f from the F″M detection circuit. However, it is necessary to adjust the installation angle, and it is difficult to adjust the satellite broadcast reception tuner unless you bring it close to the parabolic antenna, and it is difficult to adjust when the satellite broadcast reception tuner and the parabolic antenna are far apart. .

↑! However, it is extremely troublesome to adjust an antenna installed on the roof of a private residence or an apartment building.

The present invention has been made to solve these conventional drawbacks, and provides a satellite broadcasting antenna adjustment device that allows the installation angle of the antenna to be adjusted inside the tube even if the satellite broadcast reception tuner and antenna are separated. This is what we provide.

[Means for Solving the Problems] In order to solve the above problems, the present invention frequency-converts, amplifies, and detects a received signal from a satellite broadcasting antenna, and converts a level signal according to the signal level of the received signal. A voltage/frequency conversion circuit that converts the level signal into a low frequency signal according to the level signal is connected to the receiving circuit that outputs the signal.
oscillates a high frequency signal and uses its low frequency signal to r”
It is constructed by connecting an FM transmission circuit that outputs an M-modulated FM high frequency signal to the voltage/frequency conversion circuit.

It is also possible to connect the output of the F''M transmitting circuit to the antenna circuit system from the satellite broadcasting antenna to the receiving circuit.

Further, a bandpass filter for passing the received signal from the satellite broadcasting antenna is connected in series near the satellite broadcasting antenna in the antenna circuit system, and the FM high frequency signal as described in 2 is passed on the receiving circuit side of the bandpass filter. 1 through a low pass filter? It is also possible to configure it by connecting transmitting antennas for M high-frequency signals.

[Function] In the present invention equipped with such means, a level signal corresponding to the receiving level from the satellite broadcasting antenna is output from the receiving circuit, and a low frequency signal corresponding to the level signal is output from the voltage/frequency conversion circuit. The signal is converted and output, and the FM transmitting circuit outputs an FM high frequency signal obtained by I''M modulating the high frequency signal with the low frequency signal.

When the output of the FM transmitting circuit is connected to the antenna circuit system, an FM high frequency signal is output from the vicinity of the satellite broadcasting antenna.

Furthermore, in a configuration in which a bandpass filter and a low-pass filter are connected to the antenna circuit system, transmission of the FM high frequency signal to the satellite broadcast antenna is suppressed, while the FM high frequency signal is radiated near the satellite broadcast antenna.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a satellite broadcasting antenna adjustment device according to the present invention.

In the figure, reference numeral 1 is a broadcasting satellite, and a parabolic antenna 3 receives radio waves from the broadcasting satellite 1 and has a built-in converter (not shown) for converting it to a first intermediate frequency (BS-TF). ing.

An adapter 5, which will be described later, is connected to the parabolic antenna 3, and the adapter 5 is connected to a frequency conversion circuit 7 via a coaxial cable, etc., and an antenna circuit system 9 is formed from the parabolic antenna 3 to the frequency conversion circuit 7. .

The frequency conversion circuit 7 converts the first intermediate frequency from the parabolic antenna 3 into a second intermediate frequency, and is connected to the FM detection circuit 11 via an amplifier circuit (not shown), and the receiving circuit 13 It is formed.

The FM detection circuit 11 demodulates the second intermediate frequency into FM and outputs video and audio signals, and also outputs an AGC signal corresponding to the video and audio signal levels, and amplifies the AGC signal. It is connected to the amplifier circuit 15 and the frequency conversion circuit 7.

The video and audio signals are clamped and output, or re-modulated into a UI (F band) television signal and output.

The AGC amplifier circuit 15 is connected to a VFO 17 that oscillates a low frequency signal corresponding to the DC level of the amplified AGC signal. It is possible to output a frequency signal, that is, Vl? 017 functions as a voltage/frequency (V/F) conversion circuit.

The VFO 17 is connected to a conventionally known FM modulation circuit 19, and the FM modulation circuit 19 includes, for example, 12M H7,
The FM modulation circuit 19 modulates the high frequency signal from the local oscillation circuit 21 with the low frequency signal from the V I"Ol 7, and the FM modulation circuit 19 is a multiplication amplifier circuit. 23, and an FM transmitting circuit 25 is formed.

This multiplier amplification circuit 23 multiplies the FM high frequency signal by 6 to 7 and amplifies the power. Specifically, it is connected to the connection point between the coaxial cable and the frequency conversion circuit 7. There is.

However, it is not essential to connect the multiplication amplifier circuit 23 to the antenna circuit system 9, and it is also possible to connect the antenna directly to the multiplication amplifier circuit 23.

FIG. 2 shows the adapter 5 shown in FIG. 1, in which a bypass filter HPF that allows only the received signal from the parabolic antenna 3 to pass is inserted in series in the antenna circuit system 9, and a frequency conversion circuit of this bypass filter HPF. On the 7 side, there is an FM transmission amplification circuit 25 connected to the antenna circuit system 9.
A low-pass filter LPF is connected that passes only the FM high-frequency signal from the low-pass filter LP.
A transmitting antenna 27 that radiates an FM high frequency signal as a radio wave is connected to F.

In the present invention configured as described above, the satellite broadcast reception signal from the broadcasting satellite 1 received by the parabolic antenna 3 is applied to the frequency conversion circuit 7 via the bypass filter I (PF) of the adapter 5. After frequency conversion in step 7, the signal is amplified and demodulated, and video and audio signals as well as AGC signals are output.

Note that since the adapter 5 includes a low-pass filter LPF, the satellite broadcast reception signal is not output from the transmitting antenna 27.

When the FM demodulated video and audio signal levels are high, a large AGC signal is output in an attempt to suppress the signal output in the receiving circuit 13, while when the video and audio signal levels are low, a small AGC signal is output that increases the signal level. A
A GC signal is output, and this AGC signal is amplified by the AGC amplifier circuit 15 and applied to the VFO 17.

In the VFO 17, when a high level AGC signal is input, a high frequency low frequency signal is oscillated, and when a low level AGC signal is input, a low low frequency signal is oscillated, and the FM modulation circuit 19
is FM modulated.

From the multiplier amplifier circuit 23, the modulated signal is multiplied by 6 to 7 and power amplified, and the FM high frequency signal is added to the antenna circuit system 9, and the low pass filter LPF of the adapter 5 is applied.
is radiated from near the parabolic antenna 3 via the transmitting antenna 27, r? M high frequency signal is bypass filter H
The signal is reduced by the PF and is not transmitted to the converter of the parabolic antenna 3.

Therefore, when the FM receiver 29 is operated near the parabolic antenna 3, the FM high frequency signal can be received.If the received signal level is high, high sounds can be heard from the FM receiver, but if the signal level is low, low sounds can be heard. be heard.

The angle of the parabolic antenna 3 can be adjusted depending on the pitch of the received sound, and if the parabolic antenna 3 is adjusted so that the highest sound can be heard, the best condition will be obtained.

This adjustment can be made by one person while listening to the FM receiver 29 even if the receiver circuit 13 (satellite broadcast reception tuner) and the parabolic antenna 3 are far apart, as long as the FM receiver 29 is carried.

Generally, a bandpass filter is inserted on the input side of the frequency conversion circuit 7 to pass the satellite broadcast reception signal from the parabolic antenna 3.
3, it is difficult to detect.

In the embodiments described above, the AGC signal is used as a signal corresponding to the received signal level, but the present invention is not limited to this.

For example, since the FM demodulated output signal contains only noise components in a frequency band of 6 M I-1z or higher, especially around 10 MHz, the FM detection circuit 11 detects the noise signal as shown in FIG. A noise detection circuit 31 consisting of a band pass filter etc. is connected, and this noise detection circuit 31 is connected to the noise detection port g3 via a noise amplification circuit 33.
5, obtain a DC signal according to the noise level, and
FO], configurations in addition to 7 can also be implemented.

Furthermore, I? The difference signal between the M-demodulated video or audio signal and the noise signal can be used as a signal corresponding to the received signal level.

In this case, for example, a configuration may be considered in which a difference signal between the detected noise signal and the video or audio signal is formed in the noise detection circuit 35 of FIG. 3 and added to the VFo, 17.

[Effects of the Invention] As explained above, the satellite broadcasting antenna adjustment device of the present invention converts the level signal outputted according to the signal level of the received signal into a low frequency signal, and performs FM modulation with this low frequency signal. Since it is configured to output an FM high frequency signal, the FM
As long as the receiver is carried, the installation angle of the antenna can be easily adjusted by a person even if the receiving circuit, that is, the satellite broadcast receiving tuner and the antenna are far apart.

In addition, the configuration in which the FM high-frequency signal is connected to the antenna circuit system allows adjustment even if the receiving circuit and parabolic antenna are far apart, making it suitable for adjusting the A of the antenna installed on the roof of a house or condominium. .

Furthermore, in the configuration in which a bandpass filter for received signals and a low-pass filter for FM high-frequency signals are inserted in the antenna circuit system, the function of the converter provided in the antenna is not impaired.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the satellite broadcast antenna adjustment device according to the present invention, FIG. 2 is a block diagram showing an adapter in FIG. 1, and FIG. 3 is a block diagram showing another embodiment of the present invention. FIG. 2 is a block diagram of main parts shown in FIG. ■...Broadcasting satellite 3...Antenna (parabolic antenna) 5...
・Adapter 7...Frequency conversion circuit 9...Antenna circuit system 11...r'' M detection circuit 13...Reception circuit 15...Aac amplifier circuit 17...Voltage/ Frequency conversion circuit (V I”O)
19... F” M modulation circuit 21 ・ 23 ・ 25 ・ 27 ・ 29 ・ 31 ・ 33 ・ 35 ・ HP l” ・ LPF ・ ・ Local oscillation circuit ・ Multiplier amplifier circuit ・ FM transmission circuit ・ Transmission Antenna・FM reception...Noise detection circuit・Noise amplification circuit・Noise detection circuit・・Bypass filter・Low pass filter

Claims (3)

[Claims] (1) A receiving circuit that frequency converts, amplifies, and detects a received signal from a satellite broadcasting antenna and outputs a level signal corresponding to the signal level of the received signal, and a low frequency signal corresponding to this level from the level signal. 1. A satellite broadcasting antenna adjustment device comprising: a voltage/frequency conversion circuit that converts a voltage/frequency signal into a voltage/frequency signal; and an FM transmitter circuit that oscillates a high frequency signal and outputs an FM high frequency signal that is FM modulated with the low frequency signal. (2) The satellite broadcasting antenna adjustment device according to claim 1, wherein the FM transmitting circuit is connected to an antenna circuit system from the satellite broadcasting antenna to the receiving circuit. (3) A bandpass filter for passing the received signal from the satellite broadcasting antenna is connected in series near the satellite broadcasting antenna in the antenna circuit system, and the FM high frequency signal is passed to the reception circuit side of the bandpass filter. 3. The satellite broadcasting antenna adjustment device according to claim 2, wherein the transmitting antenna for the FM high frequency signal is connected through a low-pass filter.