QUANZHOU HENGLIDA TEL-EQUIPMENT CO.,LTD.
Common problem
Technical support: 
    Basic knowledge 
1. How far is the intercom? 
    Routine intercom communication distance can be up to 8-10 kilometers in open space and 3-5 kilometers in urban area. In the case of tall buildings or high mountains, the communication distance will be relatively short. When there is network support, the range of intercom calls can reach tens of kilometers. Networking is the use of relay stations (also known as base stations or relay stations) to automatically receive signals from walkie-talkies and amplify and forward them. Networking can extend the communication coverage of walkie-talkies and extend the distance of calls. Open space can reach 10-20 km (handheld walkie-talkies) or even 30-50 km (car walkie-talkies). Building can cover basement, underground parking lot, fire passage and other areas with serious shielding, which are usually called dead corners. 

2. Can mass consumers buy walkie-talkies? 
    Consumers can also buy walkie-talkies, but before buying and using walkie-talkies, they must apply to the local radio management committee (hereinafter referred to as "no commission") for a radio license and pay a frequency occupation fee. Since December 6, 2001, China has opened the civil walkie-talkie market, using 400 MHz and transmitting power less than 0.5 W, without any formalities. 

3. Can the walkie-talkie make a phone call? 
    With network support, walkie-talkies can be used to make calls. But if it is only a routine call between single computers, it can not achieve the function of calling.
Use common sense 
  A: Antenna use matters needing attention 
1. when in use, use the hand to hold the antenna not. 
2. walkie talkie antenna can not twist, otherwise easily when transmitting the power tube burn. 
3. do not use damaged antenna. At launch, if the antenna contact with skin damage, may cause Please minor burns. 
  
  B: The battery use matters needing attention 
1.we should use the original or approved batteries.
2. if the metal conductors such as jewelry, key or beads reach the bare battery electrodes, all batteries Are likely to cause damage or personal injury. Please be careful with already charged battery, especially when it into Pocket, wallet or other metal containers, need special attention. 
3. the charge should be in 5~40 degrees in the environment. If more than this temperature range, the battery life is At the same time effect, may filled rated capacity. 

  C: EMI / EMC 
 To avoid electromagnetic interference and / or electromagnetic compatibility problems caused by, with "off intercom" standard General occasions should close the walkie talkie. For example, a hospital or other health care medical equipment use occasions. In flight According to the requirements, should also be off intercom. 

  D. walkie talkie operating considerations 
1.when the walkie talkie was launched, talkie in a vertical position to maintain and keep the microphone and mouth 2.5-5Cm distance. The launch, walkie talkies from the head or the body of at least 2.5 cm. If the handheld interphone Machine to carry on the body, the launch, the antenna from the body of at least 2.5 cm. 
2. do not use in the course of many on-off action, while the volume was adjusted to fit your listening Feel the volume. 

  E. walkie talkie to use safety precautions 
1. with airbags in cars, walkie talkie on the balloon will not be involved at the start of the fan Wai. If the walkie talkie in regional scope may involve the deployment of the airbag, airbag deployed rapidly once, Walkie talkies may be as great impact injuries to the officers inside. 
2. in a potentially explosive atmosphere or the occasion, unless special certification through the walkie talkie, otherwise To close down walkie talkie. In potentially explosive atmosphere, electric spark can cause an explosion or fire. 
3. not a potentially explosive atmosphere under the replacement battery or batteries. Installing and removing the battery May cause contact EDM and cause an explosion. 
4. near blasting area and detonator region before, must first close the walkie talkie, to avoid a possible explosion Fried. 

  F. walkie talkie routine maintenance 
1. walkie talkie after long-term use, by the health, the control knob and the casing is easy to dirty, please from the walkie talkie Control knob removed, and use neutral detergent (do not use strong corrosive chemicals) and a damp cloth to clean the cabinet. The use of such as detergents, alcohol, spray or oil preparation and other chemicals may cause the walkie talkie surface and Casing damage. 
2. gently walkie talkie, not portable antenna for mobile interphone. 
3. do not apply to the attachment, please cover dust-proof cover (if equipped).
Technical assistance 
1. Can't you talk to other members of the group?
    First, make sure that the frequency and sub-audio signals you use are the same as the other members of the group; if you have no questions, make sure that the other members of the group are in the service area. 
2. The voices of other members on the channel? 
    Please change the sub-audio signal tone. At the same time, you must change the signal tone of all walkie-talkies in the group, or apply to change the frequency point. 
3. How long will the battery not last after it is properly charged? 
    Battery life is up. Please update the battery. (The number of charges and discharges normally used for Ni-MH batteries is 500, and that for lithium batteries is 1000) 
4. Interphone does not scan? 
   When programming the walkie-talkie, the channel is not included in the scanning (professional settings) or the scanning function of the whole machine is turned off. 
5. Complete frequency noise after programming? 
    The silence is turned on when programming the walkie-talkie. Non-professionals recommend not to adjust functional parameters. 
6. Regular beeping after programming? 
    Interphone programming error. The frequency written is beyond the frequency range specified by the walkie-talkie or the selected model. 
7. Silence after using headphones for a period of time? 
    The earplug socket of the walkie-talkie is broken. Send it to maintenance station for repair. 
8. Poor sensitivity of closer call distance? 
    Check whether the antenna is in good condition and whether the antenna pedestal is loose or damaged (please send it to the maintenance station for repair). 
9. Interphone receives the speaker's speech but cannot transmit it? 
    Check PTT buttons. Send it to maintenance station for repair. 
10. Can't you turn on the computer or power off frequently? 
    Check whether the battery contacts of intercom are deformed or broken. 
11. Interphone with LCD without display or error display? 
    LCD failure or poor contact of conductive rubber caused by intercom fall or improper use (sent to maintenance station for maintenance). 
12. Does the other party receive a low or intermittent voice? 
    Check whether the small hole in MIC transmitter of intercom is blocked (please send it to maintenance station for repair). 
13. Intermittent reception with high noise? 
    When the limit communication distance of the walkie-talkie is reached or the tall building is blocked in the basement, etc. (Please send it to the maintenance station for repair). 
14. How to deal with the machine after it enters the water? 
    First, the machine is disassembled, and all external parts are disassembled one by one (such as buttons, PTT glue light guide pillars, etc.). The circuit board is carefully cleaned and dried with anhydrous alcohol or special washboard water, and the stains on the circuit board are cleaned with small tools. Then, the circuit board is soaked in anhydrous alcohol, and can be cleaned with an ultrasonic cleaner conditionally. Secondly, the circuit board is removed and dried with a hairdryer (pay attention to the temperature is not high). Can be too high), and check whether the circuit board is damaged, if there is a break, use thin enameled wire to connect, use a three-meter to measure the positive and negative extreme resistance of the power supply of the board, can not be short-circuit or open (power on, check the current, normal 40 MA, launch not less than 1000MA); Finally, check whether the wireless port is dirty, such as dirty and clean up, and if there are other faults, then as usual. Rules are inspected and repaired. 
    Generally, water intake machines with serious circuit corrosion can not be repaired, so they should be disposed of in time after water intake. 
15. Processing methods of common problems in test run 
   1) Frequency point interference: In use, there are often series frequency or noise from other radio stations, which interfere with the normal use of walkie-talkies. There are three methods to deal with: 1. Frequency conversion. (2) Gaya audio or DTMF, etc. (3) Reducing the noise level (suitable for individual computers receiving interference under the same conditions) 
   2) Close Distance: When the communication distance of the walkie-talkie is several meters different from the actual need, the power and noise level of the machine can be adjusted to achieve. When the adjustment is still unable to improve, we should consider installing a turntable to solve the problem. 
   3) Sound discontinuity: Interphone communication often finds discontinuity at critical distance. At this time, the noise level can be adjusted or the sub-audio reception can be cancelled to test the effect. 
   4) Screaming: Two walkie-talkies will scream when they are only a few meters or closer. This is a normal phenomenon, which can be solved by turning off the sound to the appropriate size.