First, industry background

Sanshaoxing Fengqiao College is located in Fengqiao Town, the birthplace of "Fengqiao Experience", with a total investment of 7.500 million yuan, covers an area of about 310 acres, building area of about 6.50,000 square meters。The total construction area of the teaching and research area is about 2.70,000 square meters, composed of Liji Building, Mingde Building, Zhishan Building, Zhengxin building, cultural and sports center, library and landmark building - Xiusong Lecture Hall, can meet the annual training of about 300 shifts, 1.Training needs of 50,000 people。

Second, demand analysis

Based on the existing problems of Fengqiao College New Century Mingting Hotel:

(1) The Party school cannot communicate with the basement of the hotel;

(2) The communication between the control room and the stadium track is occasionally unclear;

(3) The basement of the Party school can not achieve stable communication with the hotel door。

Beifeng Communications further considered，In all kinds of noise, radio wave interference increasingly serious communication environment，How to solve the problems of unstable long-distance communication signals, inconvenient carrying of wired phones, poor confidentiality and so on，It is urgent to build a flexible communication management system for security, work and training personnel inside and outside the hotel，The personnel in the area can stabilize the call demand at any time and any place。

Third, the solution

The construction area of the renovation project and the outdoor park area are large, the scientific research area and the landmark buildings are scattered, the single-storey area is large, in order to achieve the ideal communication effect, it is necessary to choose more cost-effective products。According to the communication command requirements of Kaiyuan Mingting Hotel of Fengqiao University, a set of Beifeng DMR digital system was built, which was composed of two sets of BF-TR7500 repeater stations, combined circuit and branch circuit, trunk amplifier and antenna feed system:

1, the whole system to achieve security, cleaning, front desk, leadership independent calls do not affect each other。The scheme covers the indoor and outdoor areas of the hotel in a full range, and the system can form an overall platform for business communication。

2. Clear voice without noise can be realized by calling the Party school meeting site from the control room, the stadium track from the control room, the Party school meeting basement from the hotel gate, and the Party school meeting basement from the hotel to meet the full coverage of the entire college above and below ground。The system can greatly save communication expenses for users, effectively improve work efficiency, improve scheduling management, and truly realize the purpose of one-time investment and lifelong benefit。

Fourth, functional application

1.All walkie-talkies and fixed stations can be divided into multiple groups for calls, and a senior management group (or leadership group) can be set up to speak and monitor the work of the relevant personnel。

2.Each group makes its own internal calls without interfering with each other。

3.The call of the senior management group (or leader group) has priority. Even when all channels are busy, other groups that are talking can be forcibly removed to ensure that the communication of the group is smooth。

5. Networking principle

The communication of a single walkie-talkie is to call another walkie-talkie directly through the transmitting power of the walkie-talkie。Due to the low power of the walkie-talkie (generally 2-4W), the communication distance is limited when single-machine communication。In order to solve the above problems, the rotary table is placed in the area center (control room) that needs to be covered, and the receiving and transmitting antennas of the rotary table are distributed in every corner of the pre-covered area through the equipment such as the joint and branch circuit, trunk amplifier and antenna feed system。When the intercom initiates a call，No longer rely on the local power of the walkie-talkie to directly call another walkie-talkie，It is the receiving antenna closest to the intercom，The turntable receives the call signal from the antenna，Control all transmitting antennas to automatically forward the call signal，这样，Regardless of the location of the radio being called，Can receive the call signal。