Jianwu car walkie-talkie can't receive the other party's signal and can't send it out. How to debug?

Speakers are mainly divided into three categories: 1, civil interphone (below 0.5W); 2. Conventional interphone (2w ~ 5w); 3. Relay intercom (below 3W); Second, according to the purpose, it can be divided into three categories: 1, walkie-talkie (0.5w ~ 5w); 2. Car intercom (25W ~ 75W); 3. The turntable in the base; Third, the walkie-talkie is divided into 1 and vlow (136-150) according to frequency; 2.v height (150-174); 3. V. Police (340-390); 4, U low (400-430)5, U amateur (440-450)6, U high (450-470); Other frequency bands are not allowed. VHF is characterized by good diffraction and strong penetration, and is suitable for field and offshore operation units. Ultra-high frequency is characterized by poor diffraction and strong penetration, which is suitable for large and medium-sized cities with many tall buildings. You must go to a specialty store to buy a walkie-talkie with after-sales service guarantee and professional maintenance ability. Most importantly, when buying professional walkie-talkies, you must choose the walkie-talkie with the Type Approval Certificate of Radio Transmitting Equipment issued by the Ministry of Information Industry. In addition, the use of walkie-talkies must also have a legal public frequency approved by the local "radio management department". (except for civil walkie-talkies) to prevent interference with other communication equipment. Otherwise, the indiscriminate use of frequency will violate the "radio regulations", and the local "radio management department" will confiscate the illegally used walkie-talkies, and severe cases will be fined. At present, there are several kinds of civil walkie-talkies sold in the market, such as business, family, sports and leisure. People can choose walkie-talkies with different power, different performance and different shapes according to their needs. For example, managers of hotels and entertainment places can choose business walkie-talkies, which allow managers to talk to the foreman and other related employees while answering customers' calls; Equipment installation and construction enterprises can choose walkie-talkies with noise filtering function to remotely control on-site command; Tour guides of travel agencies can choose high-power and multi-channel walkie-talkies to contact scenic spots, restaurants and drivers in time. For another example, when people go shopping and participate in community activities, they can always get in touch with their families by walkie-talkie, especially when a family of three goes shopping, they can visit their own places of interest without wasting time, but at home, they can also talk to each other in the kitchen, bathroom, bedroom and garden, sun room, balcony and other places without shouting for help. Friends and relatives can use walkie-talkies for self-help travel, which can not only keep in touch, but also save a lot of mobile roaming fees. Moreover, the advantages of walkie-talkies are more obvious in the deep mountains and forests or the desert Gobi where the communication network signal is not good. Here I would like to introduce the brands and models of walkie-talkies in some common places, hoping to provide some reference for you. Construction site, property, building and workshop: Jianwu Jianwu 3 107/3207, generally using MOTOROLAGP88 and GP88S, GP3688 and Vitex vx-7R. Outdoor, tourism and sports: generally, north winds BF5 1 18, BF518A, HTC HD-K4AT donkey kong, HD-K45AT Jaguar, Motorola T5428, T5628 are used. Shopping, leisure, shopping, dormitory intercom: Motorola T4508, T5428, watch intercom 008,820. I hope you are satisfied with the above introduction!

Jianwu car walkie-talkie can't receive the other party's signal and can't send it out. How to debug?