Radio frequency cable signal attenuation detection device

Abstract

The utility model provides a radio frequency cable signal attenuation detection device which comprises an input radio frequency socket and an output radio frequency socket, the output radio frequency socket is electrically connected with the output end of a fixed coupling circuit, the input end of the fixed coupling circuit is electrically connected with the output end of an amplification circuit, and the input end of the amplification circuit is electrically connected with the output end of a signal generation circuit. The control end of the signal generation circuit is connected with the single-chip microcomputer, and the single-chip microcomputer is used for controlling the signal generation circuit to generate radio frequency signals. One branch of the input radio frequency socket is electrically connected with the load circuit, the other branch of the input radio frequency socket is electrically connected with the input end of the detection circuit, the output end of the detection circuit is electrically connected with the controller, and the single chip microcomputer is further used for receiving detection voltage output by the detection circuit; compared with a network analyzer, the signal generation circuit, the amplification circuit, the fixed coupling circuit, the load circuit, the detection circuit, the single-chip microcomputer, the output radio frequency socket and the input radio frequency socket are low in cost, simple in operation, small in size and convenient to carry.

Description

Technical Field

[0001] The utility model relates to the field of electronic communications, in particular to a radio frequency cable signal attenuation detection device. Background Art

[0002] Currently, there are numerous ultra-shortwave radios operating in the 108MHz to 400MHz frequency band. Each radio includes an RF cable connected to the antenna, and maintenance and inspection of this cable requires a dedicated instrument, a network analyzer. Network analyzers are expensive and difficult to distribute to every site, especially on ships or in isolated locations, directly impacting the radio's routine maintenance and inspection. Utility Model Content

[0003] In view of the shortcomings of fault location in the existing technology, the utility model provides a radio frequency cable signal attenuation detection device, the purpose of which is to quickly locate radio frequency cable faults through the device and improve the maintenance and repair efficiency of radio stations.

[0004] A radio frequency cable signal attenuation detection device includes an input radio frequency socket and an output radio frequency socket. The output radio frequency socket is electrically connected to the output end of a fixed coupling circuit. The input end of the fixed coupling circuit is electrically connected to the output end of an amplifying circuit. The input end of the amplifying circuit is electrically connected to the output end of a signal generating circuit. The control end of the signal generating circuit is connected to a single-chip microcomputer. The single-chip microcomputer is used to control the signal generating circuit to generate a radio frequency signal. The frequency of the radio frequency signal is 108MHz to 400MHz and the amplitude is 15dBm. One branch of the input radio frequency socket is electrically connected to a load circuit, and the other branch is electrically connected to the input end of a detection circuit. The output end of the detection circuit is electrically connected to a controller. The single-chip microcomputer is also used to receive a detection voltage output by the detection circuit.

[0005] Further, the signal generating circuit includes a frequency synthesis chip N205, the output end of the frequency synthesis chip N205 is connected to the input end of the low-pass filter Z200 through a capacitor C251, a π-type matching circuit, a capacitor C252, an RF amplifier N206, and a capacitor C249 in sequence, an RC series circuit is connected in parallel between the input and output ends of the RF amplifier N206, and the output end of the low-pass filter Z200 is the signal output end of the signal generating circuit; the control end of the signal generating circuit is connected to the single-chip microcomputer.

[0006] Furthermore, a resonant circuit is connected to the output end of the RF amplifier N206, and the resonant circuit includes an inductor L228. The inductor L228 is connected to the positive 4V power supply through a resistor R226, and the common end of the inductor L228 and the resistor R226 is grounded through parallel capacitors C247 and C248.

[0007] Further, the amplifier circuit includes a power tube BGD714 and a power correction circuit, the input end of the power tube is connected to the output end of the signal generating circuit, the output end of the power tube is connected to the input end of the fixed coupling circuit, and the control end of the power tube is connected to the positive voltage end of the fixed coupling circuit via the power correction circuit.

[0008] Further: The model of the microcontroller is C8051F020.

[0009] Furthermore, the DA inside the single chip microcomputer outputs a voltage, which is used as a power reference voltage for the power correction circuit.

[0010] Furthermore, the single chip microcomputer is connected to the display and outputs the attenuation value to the display through RS232 serial port data according to the interface protocol.

[0011] Furthermore, the fixed coupling circuit includes a coupler XC406-2, the operating frequency of the coupler XC406-2 is 30-1000 MHz, and the coupling degree is 20 dB.

[0012] Further, the detection circuit includes a capacitor C11, which is connected to ground via a resistor R11 and a capacitor C12 in sequence. The common end of the capacitor C11 and the resistor R11 is electrically connected to the positive electrode of the diode VD11. One branch of the cathode of the detection diode VD11 is connected to ground via a capacitor C13, and the other branch is connected to ground via a resistor R12 and a resistor R15 in sequence. The common end of the resistors R12 and R15 is connected to ground via a potentiometer RP1, and the middle end of the potentiometer RP1 is the output end of the detection circuit; the common end of the detection diode VD11 and the resistor R11 is connected to ground via a DC bias circuit.

[0013] Furthermore, the DC bias circuit includes a diode VD12, the anode of the diode VD12 is connected to the common end of the detection diode VD11 and the resistor R11, the cathode of the diode VD12 is grounded, the anode of the diode VD12 is further connected to the ground via the resistor R17 and the linear regulator N11 in sequence, the power supply end of the linear regulator N11 is connected to the positive 12V power supply, the power supply end of the linear regulator N11 is grounded via the capacitor C16, and the common end of the resistor R17 and the linear regulator N11 is grounded via the capacitor C17.

[0014] The beneficial effects of the utility model are as follows: after the signal generating circuit, amplifying circuit, coupling circuit, load circuit, detection circuit, single chip microcomputer, output radio frequency socket and input radio frequency socket are assembled into this utility model, compared with the network analyzer, the cost is low, the operation is simple, the size is compact and it is easy to carry; the utility model can quickly locate radio frequency cable faults and improve the maintenance and repair efficiency of radio stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural block diagram of the utility model;

[0016] Figure 2 A circuit diagram of a signal generating circuit in the present utility model;

[0017] Figure 3 This is a circuit diagram of the fixed coupling circuit in the present utility model;

[0018] Figure 4 This is a circuit diagram of the detection circuit in the utility model. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings. The embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention. The terms such as left, center, right, top, and bottom in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product and should not be considered as restrictive.

[0020] A radio frequency cable signal attenuation detection device, such as Figure 1 As shown, it includes an input RF socket and an output RF socket, the output RF socket is electrically connected to the output end of the fixed coupling circuit, the input end of the fixed coupling circuit is electrically connected to the output end of the amplifying circuit, the input end of the amplifying circuit is electrically connected to the output end of the signal generating circuit, the control end of the signal generating circuit is connected to the single-chip microcomputer, and the single-chip microcomputer is used to control the signal generating circuit to generate an RF signal, the frequency of the RF signal is 108MHz~400MHz, and the amplitude is 15dBm; one branch of the input RF socket is electrically connected to the load circuit, and the load circuit uses a power resistor model RIG2-1D-10W-50Ω±5% for matching the input power signal; another branch of the input RF socket is electrically connected to the input end of the detection circuit, and the output end of the detection circuit is electrically connected to the controller. The single-chip microcomputer is also used to receive the detection voltage output by the detection circuit and calculate the attenuation value of the RF signal based on the detection voltage, and judge whether the cable has a fault according to the attenuation threshold.

[0021] Among them, such as Figure 2As shown, the signal generating circuit includes a frequency synthesizer chip N205. The output end of the frequency synthesizer chip N205 is connected to the input end of the low-pass filter Z200 through a capacitor C251, a π-type matching circuit, a capacitor C252, a radio frequency amplifier N206, and a capacitor C249 in sequence. An RC series circuit is connected in parallel between the input and output ends of the radio frequency amplifier N206. The output end of the low-pass filter Z200 is the signal output end of the signal generating circuit; the control end of the signal generating circuit is connected to the single-chip microcomputer; the single-chip microcomputer controls the frequency The frequency synthesis chip N205 generates a radio frequency signal of a specific frequency. After filtering, amplification and other processing and stabilization, the radio frequency signal is used as the output of the signal generation circuit, thereby facilitating subsequent attenuation calculations. In order to enhance the specific frequency signal, a resonant circuit is also connected to the output end of the radio frequency amplifier N206. The resonant circuit includes an inductor L228. The inductor L228 is connected to the positive 4V power supply through a resistor R226. The common end of the inductor L228 and the resistor R226 is grounded through a parallel capacitor C247 and a capacitor C248.

[0022] The amplifier circuit includes a power tube BGD714 and a power correction circuit. The input end of the power tube is connected to the output end of the signal generating circuit, the output end of the power tube is connected to the input end of the fixed coupling circuit, and the control end of the power tube is connected to the positive voltage end of the fixed coupling circuit via the power correction circuit. The power correction circuit is used to compare the positive voltage value V+ of the fixed coupling circuit with its reference voltage and keep the radio frequency signal output by the power tube constant at 31dBm±0.25dB; the model of the single-chip microcomputer is C8051F020, and the DA inside the single-chip microcomputer outputs a voltage, which is used to provide the power correction circuit with a power reference voltage. The single-chip microcomputer is connected to the display and outputs the attenuation value to the display through the RS232 serial port data according to the interface protocol.

[0023] like Figure 3 As shown, the fixed coupling circuit includes a coupler T1. The model of coupler T1 is XC406-2. The operating frequency of coupler XC406-2 is 30-1000 MHz, the coupling degree is 20 dB, the insertion loss of the entire operating frequency band is less than 0.3 dB, the coupling flatness is ± 0.5 dB, and the power handling capacity is 15 W.

[0024] like Figure 4As shown, the detection circuit includes a capacitor C11, which is connected to ground after passing through a resistor R11 and a capacitor C12 in sequence. The common end of the capacitor C11 and the resistor R11 is electrically connected to the positive electrode of the diode VD11. One branch of the cathode of the detection diode VD11 is connected to ground after passing through a capacitor C13, and the other branch is connected to ground after passing through a resistor R12 and a resistor R15 in sequence. The common end of the resistor R12 and the resistor R15 is connected to ground after passing through a potentiometer RP1. The middle end of the potentiometer RP1 is the output end of the detection circuit; the common end of the detection diode VD11 and the resistor R11 is connected to ground after passing through a capacitor C13. The common end is grounded after passing through a DC bias circuit; the DC bias circuit includes a diode VD12, the anode of the diode VD12 is connected to the common end of the detection diode VD11 and the resistor R11, the cathode of the diode VD12 is grounded, the anode of the diode VD12 is further grounded through a resistor R17 and a linear regulator N11 in sequence, the power supply end of the linear regulator N11 is connected to a positive 12V power supply, the power supply end of the linear regulator N11 is grounded through a capacitor C16, and the common end of the resistor R17 and the linear regulator N11 is grounded through a capacitor C17.

[0025] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A radio frequency cable signal attenuation detection device, comprising an input radio frequency socket and an output radio frequency socket, characterized in that: The output RF socket is electrically connected to the output end of the fixed coupling circuit, the input end of the fixed coupling circuit is electrically connected to the output end of the amplifying circuit, the input end of the amplifying circuit is electrically connected to the output end of the signal generating circuit, the control end of the signal generating circuit is connected to the single-chip microcomputer, and the single-chip microcomputer is used to control the signal generating circuit to generate a RF signal; one branch of the input RF socket is electrically connected to the load circuit, and the other branch is electrically connected to the input end of the detection circuit, the output end of the detection circuit is electrically connected to the controller, and the single-chip microcomputer is also used to receive the detection voltage output by the detection circuit.

2. The radio frequency cable signal attenuation detection device according to claim 1, characterized in that: The signal generating circuit includes a frequency synthesis chip N205. The output end of the frequency synthesis chip N205 is connected to the input end of the low-pass filter Z200 through capacitor C251, π-type matching circuit, capacitor C252, RF amplifier N206, and capacitor C249 in sequence. An RC series circuit is connected in parallel between the input and output ends of the RF amplifier N206. The output end of the low-pass filter Z200 is the signal output end of the signal generating circuit; the control end of the signal generating circuit is connected to the single-chip microcomputer.

3. The radio frequency cable signal attenuation detection device according to claim 2, characterized in that: A resonant circuit is also connected to the output end of the RF amplifier N206. The resonant circuit includes an inductor L228. The inductor L228 is connected to the positive 4V power supply through a resistor R226. The common end of the inductor L228 and the resistor R226 is grounded through parallel capacitors C247 and C248.

4. The radio frequency cable signal attenuation detection device according to claim 1, characterized in that: The amplifier circuit includes a power tube BGD714 and a power correction circuit. The input end of the power tube is connected to the output end of the signal generating circuit, the output end of the power tube is connected to the input end of the fixed coupling circuit, and the control end of the power tube is connected to the positive voltage end of the fixed coupling circuit via the power correction circuit.

5. The radio frequency cable signal attenuation detection device according to claim 4, characterized in that: The model of the microcontroller is C8051F020.

6. The radio frequency cable signal attenuation detection device according to claim 5, characterized in that: The DA inside the microcontroller outputs a voltage, which is used as a power reference voltage for the power correction circuit.

7. The radio frequency cable signal attenuation detection device according to claim 5, characterized in that: The single chip microcomputer is connected to the display and outputs the attenuation value to the display through RS232 serial port data according to the interface protocol.

8. The radio frequency cable signal attenuation detection device according to claim 1, characterized in that: The fixed coupling circuit includes a coupler XC406-2. The operating frequency of the coupler XC406-2 is 30-1000 MHz, and the coupling degree is 20 dB.

9. The radio frequency cable signal attenuation detection device according to claim 1, characterized in that: The detection circuit includes a capacitor C11, which is grounded after passing through a resistor R11 and a capacitor C12 in sequence. The common end of the capacitor C11 and the resistor R11 is electrically connected to the positive electrode of the diode VD11. One branch of the cathode of the detection diode VD11 is grounded after passing through a capacitor C13, and the other branch is grounded after passing through resistors R12 and R15 in sequence. The common end of the resistors R12 and R15 is grounded after passing through a potentiometer RP1. The middle end of the potentiometer RP1 is the output end of the detection circuit; the common end of the detection diode VD11 and the resistor R11 is grounded after passing through a DC bias circuit.

10. The radio frequency cable signal attenuation detection device according to claim 9, characterized in that: The DC bias circuit includes a diode VD12. The anode of the diode VD12 is connected to the common end of the detection diode VD11 and the resistor R11. The cathode of the diode VD12 is grounded. The anode of the diode VD12 is further connected to ground via the resistor R17 and the linear regulator N11 in sequence. The power supply end of the linear regulator N11 is connected to a positive 12V power supply. The power supply end of the linear regulator N11 is grounded via the capacitor C16. The common end of the resistor R17 and the linear regulator N11 is grounded via the capacitor C17.

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