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VLF ground wave telephone equipment

A kind of telephone equipment, very low frequency technology, applied in the field of communication, can solve the problems of heavy maintenance and repair tasks, many external line faults, interactive interference, etc., and achieve the effect of easy installation and use, avoiding interactive interference, and stable and reliable signals

Inactive Publication Date: 2004-02-18
重庆新大地电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of wired telephone network construction consumes a lot of manpower, material resources, and financial resources. It costs hundreds of thousands of yuan to build a telephone network in a township. After the network is built, it is easily damaged by natural forces and man-made damage. There are many external line failures and heavy maintenance tasks.
Although wireless telephone equipment does not need poles and wires, it must build tall transmitting antenna towers, which are transmitted directly by air waves, which are easily blocked by mountains and deep valleys, with many blind spots, low coverage in mountainous areas, and crowded air radio frequency channels. severe interference

Method used

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  • VLF ground wave telephone equipment
  • VLF ground wave telephone equipment
  • VLF ground wave telephone equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] Example: see figure 1 , very low frequency ground wave telephone equipment, the (local) individual user telephone A picks up the phone to dial, and the signal is sent to the power amplifier transmitter of the ground wave telephone through the switchboard, and the high-power signal output by the power amplifier transmitter is fed back The wire is connected to the ground and coupled to the transmission network to radiate and propagate, and the signal is sent to the (other party) switching machine in the form of ground waves, and transferred to the other party's individual user phone B, and the signal from the party is demodulated by the receiving circuit and restored to voice , the other party's individual phone B picks up the hook, and returns the voice signal to the local party in the same way as above, and realizes a duplex intercom call between the individual user phones of both parties.

[0027] Individual user telephone circuit see figure 2Shown: The output of the...

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PUM

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Abstract

A VLF ground wave telephone equipment in VLF band (20-300 KHz) is composed of user extensions, switch, ground wave telephone power amplifier-transmitter, ground coupled transmitting network and power supply. Said user extensions consist of emitter, receiver and dialing circuit. Said ground coupled transmitting network is composed of feed back line, impedance converter, transmitting antennas, high-voltage (10KV) power transmission line, and grounding electrode networks. Its advantages are developing new frequency resource, high anti-interference power, stable and reliable signals, no blind region in transmission, low cost and high security and compatibility.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a very low frequency ground wave telephone device. Background technique [0002] At present, my country's rural communication mainly uses wired telephone equipment and wireless telephone equipment. Wired telephone equipment needs to set up dedicated poles and dedicated lines to send telephone signals to users. This kind of wired telephone network construction consumes a lot of manpower, material resources, and financial resources. It costs hundreds of thousands of yuan to build a telephone network in a township. After the network is built, it is easily damaged by natural forces and man-made damage. There are many external line failures and heavy maintenance tasks. . Although wireless telephone equipment does not need poles and wires, it must build tall transmitting antenna towers, which are transmitted directly by air waves, which are easily blocked by mountai...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04B13/02H04M1/00
Inventor 邹定武谢真华张安海潘德余
Owner 重庆新大地电子有限公司
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