Common knowledge about walkie-talkies:
How far is the communication distance of a walkie-talkie? The communication distance of conventional walkie-talkies can reach up to 8 to 10 kilometers in open areas, and up to 3 to 5 kilometers in urban areas. When there are tall buildings or mountains blocking the communication distance, the communication distance will be relatively short. When supported by the network, the call range of the walkie-talkie can reach dozens of kilometers. Networking uses repeaters (also called base stations or repeaters) to automatically receive signals transmitted from walkie-talkies and amplify and forward them. The network can extend the communication coverage of the walkie-talkie and extend the call distance. It can reach 10-20 kilometers (hand-held walkie-talkies) or even 30-50 kilometers (car-mounted walkie-talkies) in open areas. It can cover basements, underground parking lots, fire escapes, etc. in buildings that are severely shielded. , an area usually called a blind spot.
Can mass consumers buy walkie-talkies? Mass consumers can also buy walkie-talkies, but in the past, to purchase and use walkie-talkies, they had to apply to the local Radio Regulatory Commission ("WRC" for short), obtain a radio station license and pay frequency occupancy fees. Starting from December 6, 2001, my country has opened up the civilian walkie-talkie market. The use of civilian walkie-talkies with a transmission power of 400MHz and less than 0.5 watts does not require any formalities.
Can the walkie-talkie make calls? With network support, the walkie-talkie can be used to make calls. But if it is just a regular call between stand-alone phones, the phone call function cannot be realized.
Common sense when using walkie-talkies:
Precautions for using antennas 1. When using, do not pick up the antenna with your hands.
2. The walkie-talkie antenna cannot be unscrewed, otherwise the power tube will be easily burned out during transmission.
3. Do not use damaged antennas. If a damaged antenna comes into contact with your skin while transmitting, it may cause minor burns.
Battery usage precautions 1. Original or approved batteries should be used.
2. All batteries may cause damage or personal injury if metal conductors such as jewelry, keys or beads touch the exposed electrodes of the battery. Please handle a charged battery with caution, especially when placing it in a pocket, wallet, or other metal container.
3. Charging should be carried out in an environment of 5 to 40 degrees. If the temperature exceeds this range, the battery life will be affected and the battery may not be fully charged to the rated capacity.
Electromagnetic interference/electromagnetic compatibility To avoid problems caused by electromagnetic interference and/or electromagnetic compatibility, the intercom should be turned off in places with a "Turn off intercom" sign. For example, hospitals or other places where health care equipment is used. When traveling on an airplane, intercoms should also be turned off as required.
Notes on walkie-talkie operation:
When the walkie-talkie is transmitting, keep the walkie-talkie in a vertical position and keep the distance between the microphone and the mouth 2.5-5 cm. When transmitting, keep the radio at least 2.5 cm away from your head or body. If the handheld walkie-talkie is carried on the body, the antenna should be at least 2.5 cm away from the body when transmitting.
2. Do not turn on and off multiple times during use, and adjust the volume to a volume that suits your hearing.
Safety precautions for using walkie-talkies 1. In a car with an airbag, do not place the walkie-talkie within the range that may be involved when the airbag is deployed. If the intercom is in the area that may be involved when the air bag deploys, once the air bag deploys rapidly, the intercom may injure people in the car with great impact.
2. In potentially explosive atmospheres or situations, the intercom must be turned off unless it has passed special certification. In potentially explosive atmospheres, electrical sparks can cause explosions or fires.
3. Do not replace or charge the battery in a potentially explosive atmosphere. Installation and removal of the battery may cause contact sparks and cause an explosion.
4. The walkie-talkie must be turned off before approaching the blasting area and the area where the detonator is located to avoid possible explosions.
Routine maintenance of the walkie-talkie:
After long-term use of the walkie-talkie, the buttons, control knobs and casing can easily become dirty. Please remove the control knob from the walkie-talkie and clean it with a mild detergent. Clean the case with a solvent (do not use strong corrosive chemicals) and a damp cloth. The use of chemicals such as stain removers, alcohol, sprays or petroleum preparations may cause damage to the surface and casing of the radio. 2. Handle the walkie-talkie with care, and do not move the walkie-talkie with the antenna. 3. When accessories are not available, please cover them with dust-proof covers (if equipped).
Intercom Technical Assistant:
Can’t talk to other team members in the group?
First confirm whether the frequency and sub-audio signal you are using are the same as those of other members of the group; if there is no problem, please confirm whether other members of the group are within the service area.
The voices of other team members appear in 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 for a frequency change.
How long will the battery last after being charged correctly? The battery life has expired, please update the battery. (The normal number of charge and discharge times for nickel-metal hydride batteries is generally 500 times, and for lithium batteries is 1,000 times)
The walkie-talkie does not scan? When programming the walkie-talkie, the channel is not included in the scan (professional setting) or the scanning function of the entire machine is turned off.
Full-band noise after programming? The intercom was programmed with all squelches turned on. Non-professionals are advised not to adjust functional parameters.
A regular beeping sound appears after programming? Radio programming error. The programmed frequency exceeds the specified frequency range of the intercom or the selected model and machine are not valid.
No sound after using headphones for a period of time? The earphone socket of the intercom is broken. Send it to a repair station for repair.
The sensitivity becomes worse as the call distance becomes closer? Check whether the antenna is intact and whether the antenna base is loose or damaged (if so, please send it to a repair station for repair).
The walkie-talkie can receive the other party's speech but cannot transmit? Check the PTT button. Send it to a repair station for repair.
Can’t turn on or power outages frequently? Check whether the battery contacts of the walkie-talkie are deformed or broken.
The intercom with LCD has no display or an error display? The walkie-talkie has been dropped or used improperly, resulting in broken LCD or poor conductive rubber contact (send it to a repair station for repair).
The other party’s receiving sound is low or the voice is intermittent? Check whether the small hole in the MIC transmitting area of ??the walkie-talkie is blocked (if not, please send it to a service station for repair).
Reception is intermittent with loud noise? The communication distance of the walkie-talkie has been reached or there is a tall building blocking it in the basement (otherwise, please send it to a repair station for repair).
How to deal with water in the machine? First disassemble the machine and disassemble all external parts one by one (such as buttons, PTT glue, light guide pillars, etc.), carefully clean and dry the circuit board with absolute alcohol or special washing water, and use small tools to clean the circuit. stains on the board; then soak it in anhydrous alcohol, and use an ultrasonic cleaner to clean it if possible; then take it out and blow it dry with a hair dryer (note that the temperature should not be too high), and check whether the circuit board is damaged and if there is any disconnection Use thin enameled wires for connection, and use a three-purpose meter to measure the resistance of the positive and negative terminals of the power supply of the board. There should be no short circuit or open circuit (power on and check the current, which is normally about 40MA and not less than 1000MA when transmitting); finally, check the wireless port Check whether it is dirty. If it is dirty, clean it together. If there are other faults, perform regular maintenance. Water-infused machines with serious circuit corrosion generally cannot be repaired, so the machine should be disposed of promptly after water intrusion.
How to deal with common problems during test operation 1. Frequency interference: During use, there is often cross-frequency or noise from other radio stations, which interferes with the normal use of the walkie-talkie. There are three solutions: ① Change the frequency. ②Gaya audio or DTMF, etc. ③Reduce the squelch level (applicable when individual machines receive 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 machine power and squelch level can be adjusted to accomplish. If the problem still cannot be improved after adjustment, consider installing a repeater to solve the problem.
3. Intermittent sound: Intermittent phenomena are often found in intercom communication at critical distances. At this time, you can adjust the squelch level or cancel the sub-audio reception to test the effect.
4. Howling: Howling will occur when two walkie-talkies communicate with each other when the distance is only a few meters or closer. This is a normal phenomenon and can be solved by turning down the sound to an appropriate volume.