Underground and ground contact of the territory


Underground garage only elevator, emergency access and ventilation pipes connected with the ground, almost closed space. Radio waves can only be transmitted to the ground by penetrating the concrete layer.


High-rise buildings In order to be strong, the concrete layer is relatively thick, and there are reinforced mesh structure. Radio waves can not penetrate.


Parking management and security personnel in the use of walkie-talkie for underground and ground calls, either is not clear or can not call. The work had a great impact.

A solution to solve all the problems

Walkie talkie Two-way Repeater Box

Walkie talkie Two-way Repeater Box

Two-way of the radios can both transmit and receive in VHF/UHF/Digital/Analog band.

Relay box at both ends of the walkie-talkie as a signal source, the middle through the wired connection. Two signal sources can be arranged in different locations, expand the signal coverage area, reduce dead ends.

The antenna of the walkie-talkie is replaced by a high-gain antenna with a gain value of 6.0dB.

The gain antenna and the walker use feeder links, and the feeder can pass through the weak wells through the ground and the ground. Send the underground signal to the ground.

Installation of underground garage and ground communication equipment

A and B two walkie-talkie as a transit signal source, for the C and D from the transit bridging role.

A and B two sources are located in the ground and ground. So that the ground and underground in the A, B under the coverage of two signal sources.

C and D can not be communicated directly through. With the transfer of A and B, C and D can be communicated.

Underground garage and ground communication

Together to build a safe living environment.

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