CN212543767U - Extended mobile communication equipment based on VHF/DSC VHF system for ship - Google Patents

Extended mobile communication equipment based on VHF/DSC VHF system for ship Download PDF

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CN212543767U
CN212543767U CN202021486201.4U CN202021486201U CN212543767U CN 212543767 U CN212543767 U CN 212543767U CN 202021486201 U CN202021486201 U CN 202021486201U CN 212543767 U CN212543767 U CN 212543767U
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module
key
power supply
vhf
audio
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崔昆涛
孙文强
孙文力
张吉平
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Dalian Maritime University
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Dalian Maritime University
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Abstract

The invention discloses an extended mobile communication device based on a marine VHF/DSC very high frequency system, wherein an extended mobile communication link adopts selectable wireless technologies such as Wi-Fi (wireless fidelity) of a 2.4G frequency band, and the extended mobile communication device comprises a host and a handheld mobile communication machine, realizes the VHF voice communication between ships on the handheld portable mobile communication machine and the important function of data communication, can provide more flexible and efficient communication service for a ship operator on duty, and ensures the safe sailing and the safe communication requirements of the ship at sea.

Description

Extended mobile communication equipment based on VHF/DSC VHF system for ship
Technical Field
The invention relates to communication equipment, in particular to extended mobile communication equipment based on a VHF/DSC very high frequency system for a ship.
Background
At present, VHF/DSC VHF communication equipment for ships is all fixed and is arranged at a fixed position of a ship driving platform; when a driver on duty carries out collision avoidance operation on the sea, the driver on duty needs to reach a fixed position to communicate with other ships, certain adverse effect is expected to be generated on duty, and inconvenience factors are increased.
Disclosure of Invention
According to the problems existing in the prior art, the invention discloses an extended mobile communication device based on a VHF/DSC very high frequency system for a ship, which comprises a host, a plurality of handheld mobile communication machines and a host power supply, wherein the host power supply is connected with the handheld mobile communication machines;
the host computer is in wireless connection with a plurality of the handheld mobile communicators;
the host is connected with the host power supply;
the host comprises a shell I, and a central processing unit I, a power supply module I, an audio coding and decoding module I, an audio power supply module I, an LED lamp module I and an interface module I are arranged in the shell I;
a key module I is arranged outside the shell I;
the central processing unit I is electrically connected with the power supply module I, the audio encoding and decoding module I, the LED lamp module I, the key module I and the interface module I respectively;
the audio coding and decoding module I is electrically connected with the audio power supply module I;
the power supply module I is electrically connected with the audio encoding and decoding module I, the audio power supply module I, the LED lamp module I, the key module I and the interface module I respectively;
the handheld mobile communication machine comprises a shell II, and a central processing unit II, a power supply module II, an audio coding and decoding module II, an audio power supply module II, an LED lamp module II, an interface module II and a power amplifier module are arranged in the shell II;
a key module II is arranged inside the shell II;
the central processing unit II is respectively and electrically connected with the power supply module II, the audio encoding and decoding module II, the audio power supply module II, the LED lamp module II, the key module II, the interface module II and the power amplification module;
the audio encoding and decoding module II is respectively and electrically connected with the power amplification module and the audio power supply module II;
the power module II is respectively electrically connected with the audio encoding and decoding module II, the audio power supply module II, the LED lamp module II, the key module II, the interface module II and the power amplifier module.
Furthermore, a CAN bus-to-UART module is arranged in the shell I; the CAN bus-to-UART module is electrically connected with the central processing unit I.
Furthermore, the structure of the central processing unit I is the same as that of the central processing unit II, the chip type adopted by the central processing unit I is ESP32-WROVER, and a 3V3 pin of the ESP32-WROVER is connected with the ground through a series resistor R1 and a capacitor C3 and is connected with the ground and VDD33 through a parallel capacitor C1 and a capacitor C2.
Furthermore, the audio encoding and decoding module I and the audio encoding and decoding module II have the same structure, the chip type adopted by the audio encoding and decoding module I is ES8388, and the ES8388 is connected with an audio input interface through a LIN2 pin and a RIN2 pin; the ES8388 is connected to ground through a PGND pin.
Furthermore, an RX/TX antenna II is arranged on the upper portion of the outer portion of the shell I, and a LAN interface I, a LAN interface II, a CAN interface, a power supply interface and a power supply switch are arranged on the lower portion of the outer portion of the shell I.
Further, the key module II comprises a screen brightness adjusting key, a PTT emission key, an up-turning key, a down-turning key, a high/low power emission switching key, a buzzer, a VHF16 channel shortcut key, a VHF channel scanning key, a squelch key and a power on/off/volume adjusting knob;
the screen brightness adjusting key and the PTT transmitting key are arranged on the side face of the shell II;
the up-turning key, the down-turning key, the high/low power emission switching key, the VHF16 channel shortcut key, the VHF channel scanning key and the squelch key are arranged in the middle of the upper surface of the shell II;
and the on-off/volume adjusting knob is arranged at the top of the shell II.
Furthermore, the audio power supply module I and the audio power supply module II have the same structure, the chip adopted by the audio power supply module I is LP2985A-33DBV1, a BYPASS pin of the LP2985A-33DBV1 is connected with the ground through a capacitor C189, and a VOUT pin of the LP2985A-33DBV1 is connected with the ground and a 3.3N power supply through parallel capacitors C204 and C192.
Due to the adoption of the technical scheme, the extended mobile communication equipment based on the VHF/DSC VHF system for the ship comprises a host and a handheld mobile communication machine, wherein a wireless communication link between the host of the extended mobile communication equipment and the handheld mobile communication machine can adopt selectable wireless technologies such as Wi-Fi (wireless fidelity) of a 2.4G frequency band, so that the important functions of VHF voice communication and data communication between ships on the handheld portable mobile communication machine are realized, more flexible and efficient communication service can be provided for a ship operator on duty, and the requirements of safe navigation and safe communication of the ship are met; except that voice transmission, the utility model discloses a need carry out necessary data communication interaction between host computer, the handheld mobile communication machine, wireless communication link's bandwidth, speed and coverage can satisfy system performance requirement, the utility model discloses can compatible international mainstream marine VHF/DSC very high frequency communication equipment, carry out simple and convenient extension through current marine VHF/DSC very high frequency communication equipment's standard interface, need not reequip current communication equipment, realized nimble efficient communication service extension and system integration.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic connection diagram of the present invention;
fig. 3(a) is a front view of the main power supply housing of the present invention; (b) is a side view of the main engine power supply shell of the utility model;
fig. 4(a) is a rear view of the main body housing of the present invention; (b) is a side view of the host shell of the utility model;
FIG. 5 is a schematic diagram of the main frame of the present invention;
FIG. 6 is a block diagram of the internal structure of the host of the present invention;
fig. 7 is a schematic structural view of the handheld mobile communication device of the present invention;
fig. 8 is a block diagram of a handheld mobile communication device in accordance with the present invention;
fig. 9(a) is a front view of a housing of the handheld mobile communication device of the present invention; (b) is the side view of the shell of the hand-held mobile communication machine of the utility model; (c) the back view of the shell of the handheld mobile communication machine of the utility model is shown;
fig. 10 is a schematic circuit diagram of the cpu of the present invention;
fig. 11 is a schematic circuit diagram of the audio encoding and decoding module of the present invention;
fig. 12 is a schematic circuit diagram of the audio power supply module of the present invention;
fig. 13 is a schematic circuit diagram of an LED module according to the present invention;
fig. 14 is a schematic circuit diagram of the key module of the present invention;
fig. 15(a) is a schematic diagram of a charging interface circuit of the power module of the present invention;
fig. 15(b) is a schematic diagram of a transmission data interface circuit of the power module of the present invention;
fig. 15(c) is a schematic diagram of a controller circuit of the power module of the present invention;
fig. 15(d) is a schematic diagram of a battery circuit of the power module of the present invention.
In the figure: 1. a host, 2, a handheld mobile communication device, 3, a host power supply, 4, a computer, 5, a VHF/DSC host for ship, 6, a microphone handle, 7, an RX/DSC antenna, 8, an RX/TX antenna I, 9, a shell I, 10, an RX/TX antenna II, 11, an LAN interface I, 12, an LAN interface II, 13, a CAN interface, 14, a power supply interface, 15, a power supply switch, 16, a shell II, 17, a screen brightness adjusting button, 18, a PTT transmitting button, 19, an upturning button, 20, a down button, 21, a high/low power transmitting switching button, 22, a buzzer, 23, a VHF16 channel shortcut button, 24, a VHF channel scanning button, 25, a mute button, 26, a screen, 27, a switch/volume adjusting button, 28, a transceiving antenna, 29, a buckle, 30, a rechargeable battery, 31, a power supply shell, 32, a power supply input interface, 33. a power output interface; 100. central processing unit I, 101, power module I, 102, audio coding and decoding module I, 103, audio power module I, 104, LED lamp module I, 105, interface module I, 106, button module I, 107, central processing unit II, 108, power module II, 109, audio coding and decoding module II, 110, audio power module II, 111, LED lamp module II, 112, interface module II, 113, power amplifier module, 114, button module II, 115, CAN bus changes UART module.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the drawings in the embodiments of the present invention:
fig. 1 is a schematic structural view of the present invention; FIG. 2 is a schematic connection diagram of the present invention; an extended mobile communication device based on a VHF/DSC very high frequency system for a ship comprises a host 1, a plurality of handheld mobile communication devices 2 and a host power supply 3;
the host 1 is in wired connection with a VHF/DSC host 5 for a ship through a standard interface, and the information interaction types comprise a PTT (push-to-talk) emission instruction, AUD/SPK (autonomous Underwater vehicle/digital link) voice and other control instructions and state information;
the host 1 is in wireless connection with the handheld mobile communication devices 2 to carry out voice and data interaction; the handheld mobile communication machine 2 sends the voice information, the transmission control instruction, the VHF channel instruction and other information to the host machine 1 through a wireless channel; after being processed by the host 1, the data are sent to the host 1 of the VHF/DSC VHF communication system for the ship in a wired connection mode and are transmitted by a transmitter of the VHF communication system for the ship; the handheld mobile communication machine 2 realizes the functions of equipment registration, VHF channel selection/management, PTT transmission, AUD/SPK voice, voice playback and the like; the voice information received by the VHF/DSC VHF communication equipment for the ship is transmitted to the host 1 in a wired mode; after being processed by the host 1, the data is sent to the handheld mobile communication machine 2 through a wireless channel; if the input interface of the operation terminal of the VHF/DSC VHF system for the ship is not consistent with the interface standard of the host computer of the expanded mobile communication equipment, the interface adapter box can be connected to convert required signals and data to be connected to the interface of the host computer of the expanded mobile communication equipment.
The host 1 is connected with the host power supply 3;
fig. 3(a) is a front view of the main power supply housing of the present invention; fig. 3(b) is a side view of the power supply housing of the host of the present invention;
the host power supply 3 comprises a host power supply shell 31, a host power supply input interface 32 and a host power supply output interface 33;
fig. 4(a) is a rear view of the main body housing of the present invention; fig. 4(b) is a side view of the main body case of the present invention;
the host 1 comprises a shell I9, an RX/TX antenna II 10 is arranged at the upper part of the outer part of the shell I9, and a LAN interface I11, a LAN interface II 12, a CAN interface 13, a power supply interface 14 and a power supply switch 15 are arranged at the lower part of the outer part of the shell I9;
FIG. 5 is a schematic diagram of the main frame of the present invention; FIG. 6 is a block diagram of the internal structure of the host of the present invention; the shell I9 is internally provided with a central processing unit I100, a power supply module I101, an audio coding and decoding module I102, an audio power supply module I103, an LED lamp module I104 and an interface module I105;
a key module I106 is arranged outside the shell I9;
the central processing unit I100 is electrically connected with the power supply module I101, the audio coding and decoding module I102, the LED lamp module I104, the key module I106 and the interface module I105 respectively;
the audio coding and decoding module I102 is electrically connected with the audio power supply module I103;
the power supply module I101 is electrically connected with the audio encoding and decoding module I102, the audio power supply module I103, the LED lamp module I104, the key module I106 and the interface module I105 respectively;
fig. 7 is a block diagram of the internal structure of the host handheld mobile communication device of the present invention; fig. 8 is a block diagram of the internal structure of the handheld mobile communication device of the present invention;
the handheld mobile communicator 2 includes a housing ii 16,
the central processing unit II 107, the power supply module II 108, the audio coding and decoding module II 109, the audio power supply module II 110, the LED lamp module II 111, the interface module II 112 and the power amplifier module 113 are arranged in the shell II 16;
a key module II 114 is arranged inside the shell II 16;
the central processing unit II 107 is electrically connected with the power supply module II 108, the audio coding and decoding module II 109, the audio power supply module II 110, the LED lamp module II 111, the key module II 114, the interface module II 112 and the power amplifier module 113 respectively;
the audio encoding and decoding module II 109 is electrically connected with the power amplifier module 113 and the audio power supply module II 110 respectively;
the power module II 108 is electrically connected with the audio encoding and decoding module II 109, the audio power supply module II 110, the LED lamp module II 111, the key module II 114, the interface module II 112 and the power amplifier module 113 respectively.
Furthermore, a CAN bus-to-UART module 115 is arranged in the shell I9; the CAN bus-to-UART module 115 is electrically connected with the central processing unit I100.
Fig. 9(a) is a front view of a housing of the handheld mobile communication device of the present invention; fig. 9(b) is a side view of the housing of the handheld mobile communication device of the present invention; fig. 9(c) is a rear view of the housing of the handheld mobile communication device of the present invention; the key module II 114 comprises a screen brightness adjusting key 17, a PTT transmitting key 18, an up-turning key 19, a down-turning key 20, a high/low power transmitting and switching key 21, a buzzer 22, a VHF16 channel shortcut key 23, a VHF channel scanning key 24, a mute key 25 and an on-off/volume adjusting knob 27;
the screen brightness adjusting key 17 and the PTT transmitting key 18 are arranged on the side face of the shell II 16;
the up-down key 19, the down-down key 20, the high/low power transmission switching key 21, the VHF16 channel shortcut key 23, the VHF channel scanning key 24, and the mute key 25 are disposed at the center of the upper surface of the case ii 16;
the on-off/volume adjusting knob 27 is arranged at the top of the shell II 16;
the shell II 16 further comprises a transceiving antenna 28 and a buckle 29; a rechargeable battery 30 is also arranged inside the shell II 16;
further, fig. 10 is a schematic circuit diagram of the cpu according to the present invention; the central processing unit I100 and the central processing unit II 107 have the same structure, the chip type adopted by the central processing unit I100 is ESP32-WROVER, and a VDD _ SDIO pin of the ESP32-WROVER is connected with the ground through a capacitor C18 and a capacitor C24 respectively; the SENSOR _ VP pin of the ESP32-WROVER is connected with the SENSOR _ CAPP pin through a capacitor C16, and the SENSOR _ CAPN pin of the ESP32-WROVER is connected with the SENSOR _ VN pin through a capacitor C17; the ESP32-WROVER module integrates the functions of an antenna switch, an RF balun, a power amplifier, a receiving low noise amplifier, a filter, a power management module and the like. ESP32 may run applications as a standalone system or slave to the host MCU, providing Wi-Fi and Bluetooth capabilities through the SPI/SDIO or I2C/UART interfaces.
Fig. 11 is a schematic circuit diagram of the audio encoding and decoding module of the present invention; the audio coding and decoding module I102 and the audio coding and decoding module II 109 have the same structure, the chip type adopted by the audio coding and decoding module I102 is ES8388, and the ES8388 is connected with an audio input interface through a LIN2 pin and a RIN2 pin; the ES8388 is connected to ground through a PGND pin.
Fig. 12 is a schematic circuit diagram of the audio power supply module of the present invention; the audio power supply module I103 and the audio power supply module II 110 are identical in structure, a chip adopted by the audio power supply module I103 is LP2985A-33DBV1, a BYPASS pin of the LP2985A-33DBV1 is connected with the ground through a capacitor C189, and a VOUT pin of the LP2985A-33DBV1 is connected with the ground and a 3.3N power supply through parallel capacitors C204 and C192.
Fig. 13 is a schematic circuit diagram of an LED module according to the present invention; the LED module I104 and the LED module II 111 are identical in structure.
Fig. 14 is a schematic circuit diagram of the key module of the present invention; the structure of the key module I106 is the same as that of the key module II 114, and the chip model number adopted by the key module I106 is KE: DSHP08 TSGER.
Fig. 15(a) is a schematic diagram of a charging interface circuit of the power module of the present invention, fig. 15(b) is a schematic diagram of a data transmission interface circuit of the power module of the present invention, fig. 15(c) is a schematic diagram of a controller circuit of the power module of the present invention, fig. 15(d) is a schematic diagram of a battery circuit of the power module of the present invention, and the power module i 101 and the power module ii 108 have the same structure; the power supply module I101 comprises a charging interface circuit, a data transmission interface circuit, a controller circuit and a battery circuit, wherein the controller circuit adopts a chip model of CP2102N-A01-GQFN 28.
In addition, the main machine 1 is connected to an interface corresponding to the marine VHF/DSC main machine 5 communication equipment through the LAN interface 11 or the CAN interface 13, and as the interfaces of the marine VHF/DSC communication equipment of different brands are possibly different, only one corresponding matched interface is needed to be selected for connection, and the marine VHF/DSC main machine 5 is also provided with a marine VHF/DSC main machine speech handle 6, an RX/DSC antenna 7 and an RX/TX antenna 8;
after the connection is completed, the handheld mobile communication device 2 and the host 1 are registered, and one host can register a plurality of handheld mobile communication devices.
After the portable VHF/DSC host computer 5 is started, when the portable mobile communication machine 2 is used for communication, the corresponding VHF channel number is selected by adjusting the VHF channel adjusting knob 29, at the moment, a VHF channel selecting instruction is sent to the host computer 1 by the portable mobile communication machine 2 through a wireless communication link, and the channel selection of the marine VHF/DSC host computer 5 is completed through the data interface of the host computer and the marine VHF/DSC host computer 5. Similarly, when the VHF/DSC host 5 for the ship selects the VHF channel, the handheld mobile communication device 2 completes the channel synchronization at the same time.
When the PTT transmit button 18 is pressed on the handheld mobile communicator 2, a transmit instruction is sent from the handheld mobile communicator 2 to the host 1 via the wireless communication link, and the marine VHF/DSC host 5 is adjusted to a transmit state through the data interface with the marine VHF/DSC host 5. The voice data of the hand-held mobile communication machine 2 is sent to the VHF/DSC host 5 for transmitting through the communication link.
When the VHF/DSC host 5 receives the voice message, the voice message is played in the handheld mobile communication machine 2 through the communication link.
When the system is started up, remote control instruction operations such as squelch, multi-channel watch, high-power/low-power emission and the like of the marine VHF/DSC host machine 5 can be completed by the handheld mobile communication machine 2, the marine VHF/DSC host machine 5 receives the control instruction, after the specified operation is completed, the state information is fed back to the handheld mobile communication machine terminal, and the communication process is consistent with the content.
When the system is powered on, it can be connected to the PC4 through the LAN interface 12 of the host 1, and the basic configuration of the host 1 is paired with the PC 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. An extended mobile communication device based on VHF/DSC VHF system for ship, characterized in that: comprises a host (1), a plurality of handheld mobile communicators (2) and a host power supply (3);
the host (1) is wirelessly connected with a plurality of handheld mobile communicators (2);
the host (1) is connected with the host power supply (3);
the host (1) comprises a shell I (9), wherein a central processing unit I (100), a power supply module I (101), an audio coding and decoding module I (102), an audio power supply module I (103), an LED lamp module I (104) and an interface module I (105) are arranged in the shell I (9);
a key module I (106) is arranged outside the shell I (9);
the central processing unit I (100) is electrically connected with the power supply module I (101), the audio coding and decoding module I (102), the LED lamp module I (104), the key module I (106) and the interface module I (105) respectively;
the audio coding and decoding module I (102) is electrically connected with the audio power supply module I (103);
the power supply module I (101) is electrically connected with the audio coding and decoding module I (102), the audio power supply module I (103), the LED lamp module I (104), the key module I (106) and the interface module I (105) respectively;
the handheld mobile communication machine (2) comprises a shell II (16), wherein a central processing unit II (107), a power supply module II (108), an audio coding and decoding module II (109), an audio power supply module II (110), an LED lamp module II (111), an interface module II (112) and a power amplifier module (113) are arranged in the shell II (16);
a key module II (114) is arranged in the shell II (16);
the central processing unit II (107) is electrically connected with the power supply module II (108), the audio coding and decoding module II (109), the audio power supply module II (110), the LED lamp module II (111), the key module II (114), the interface module II (112) and the power amplifier module (113) respectively;
the audio coding and decoding module II (109) is electrically connected with the power amplifier module (113) and the audio power supply module II (110) respectively;
the power module II (108) is electrically connected with the audio coding and decoding module II (109), the audio power supply module II (110), the LED lamp module II (111), the key module II (114), the interface module II (112) and the power amplifier module (113) respectively.
2. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: a CAN bus-to-UART module (115) is further arranged in the shell I (9); the CAN bus-to-UART module (115) is electrically connected with the central processing unit I (100).
3. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: the central processing unit I (100) and the central processing unit II (107) are identical in structure, the chip type adopted by the central processing unit I (100) is ESP32-WROVER, a 3V3 pin of the ESP32-WROVER is connected with the ground through a series resistor R1 and a capacitor C3, and is connected with the ground and VDD33 through a parallel capacitor C1 and a capacitor C2.
4. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: the audio encoding and decoding module I (102) and the audio encoding and decoding module II (109) have the same structure, the chip type adopted by the audio encoding and decoding module I (102) is ES8388, and the ES8388 is connected with an audio input interface through a LIN2 pin and a RIN2 pin; the ES8388 is connected to ground through a PGND pin.
5. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: an RX/TX antenna II (10) is arranged on the upper portion of the outer portion of the shell I (9), and a LAN interface I (11), a LAN interface II (12), a CAN interface (13), a power supply interface (14) and a power supply switch (15) are arranged on the lower portion of the outer portion of the shell I (9).
6. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: the key module II (114) comprises a screen brightness adjusting key (17), a PTT transmitting key (18), an up-turning key (19), a down-turning key (20), a high/low power transmitting switching key (21), a buzzer (22), a VHF16 channel shortcut key (23), a VHF channel scanning key (24), a squelch key (25) and an on-off/volume adjusting knob (27);
the screen brightness adjusting key (17) and the PTT transmitting key (18) are arranged on the side surface of the shell II (16);
the up-down key (19), the up-down key (20), the high/low power transmission switching key (21), the VHF16 channel shortcut key (23), the VHF channel scanning key (24), and the mute key (25) are disposed at the center of the upper surface of the housing ii (16);
the on-off/volume adjusting knob (27) is arranged at the top of the shell II (16).
7. An extended mobile communication device based on VHF/DSC VHF system for ship according to claim 1, characterized in that: the audio power supply module I (103) and the audio power supply module II (110) are identical in structure, a chip adopted by the audio power supply module I (103) is LP2985A-33DBV1, a BYPASS pin of the LP2985A-33DBV1 is connected with the ground through a capacitor C189, and a VOUT pin of the LP2985A-33DBV1 is connected with the ground and a 3.3N power supply through parallel capacitors C204 and C192.
CN202021486201.4U 2020-07-24 2020-07-24 Extended mobile communication equipment based on VHF/DSC VHF system for ship Active CN212543767U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021486201.4U CN212543767U (en) 2020-07-24 2020-07-24 Extended mobile communication equipment based on VHF/DSC VHF system for ship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021486201.4U CN212543767U (en) 2020-07-24 2020-07-24 Extended mobile communication equipment based on VHF/DSC VHF system for ship

Publications (1)

Publication Number Publication Date
CN212543767U true CN212543767U (en) 2021-02-12

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