The radio station has noise 100 at the time of lightning

EMI (Electromagnetic Interference) is interference that occurs when an electronic device is operated in the vicinity of an electromagnetic field within the radio frequency spectrum (RF) generated by another electronic device. The internal circuitry of a personal computer generates an electromagnetic field within the RF spectrum. In addition, cathode ray tube displays also generate an electromagnetic field with a wide frequency band.

These transmitters can interfere with the work of sensitive radio receivers in the vicinity. If you have any type of radio receiver and use it while you are operating your personal computer, you may hear radio frequency noise generated by the PC system inside the receiver. Medium or high energy radio transmitters can generate electromagnetic fields strong enough to disrupt the normal operation of nearby electronic equipment.

If you live near a radio station or within the urban area of a large city, you may have experienced electromagnetic interference from radio or television transmitters. In areas with strong RF levels, cordless**, home entertainment systems, computers, and certain ** devices may all stop working. Problems caused by electronic interference can be minimized by ensuring that all electronic equipment is operated on a good electronic ground system.

In addition, peripherals connected by ropes or cables in electronic devices or computer systems should, if possible, be shielded to prevent unwanted RF energy from entering or leaving. Specialized components such as line filters, capacitors, and inductors can be installed on high-energy wires and interconnects to reduce the electromagnetic interference magnetization coefficient of some systems. Before making any modifications to the device, contact the manufacturer for technical advice.

This is particularly important if the amendment is made that could invalidate the existing warranty and is necessary when amending the medical device. name=electromagnetic pulsecname=electromagnetic pulsesite=category=general computing termsdef=

An electromagnetic pulse (EMP) is a sudden, violent burst of electromagnetic (EM) energy, accompanied by a massive increase in particles, usually electrons. EMP can include most of the energy components of the EM spectrum, from low-frequency broadcasts to ultraviolet wavelengths. Lightning can produce localized EMPs, which will generate a strong current in nearby lines.

A single electrical shock can destroy sensitive hardware, such as computers and peripherals. All electronic and communication systems should have some safeguards in place to prevent the effects of EMP. Transient suppressors, also known as shock protection, AC outlets, and modem sockets, provide EMP protection during limited thunderstorms.

The best way to protect yourself is to unplug the AC wires and your computer's modem wires when not in use. A high-energy hydrogen bomb** will produce a powerful EMP over a large geographical area. This will result in the destruction of electrical currents within wireless antennas, ** wires, and other useful wires.

Strategic nuclear weapons are used in these areas for the purpose of destroying communications and/or electronic infrastructure, which is known as electromagnetic bombs.

Question 1: This phenomenon is so normal that you can ignore it, and it seems that grounding doesn't play a big role.

The second question: not the lightning rod is higher than the antenna to avoid lightning, the lightning rod can protect the needle tip as the apex, the needle body as one side of the 45 ° angle range, higher than the 45 ° angle on the other side of the object is not protected, and can only avoid lightning directly hit the antenna, induction lightning can not be avoided, it is difficult to ensure safety. Therefore, try to avoid using the radio station in thunderstorming weather, especially when the thunderstorm clouds are very low and very close to yourself, you must turn off the power and unplug the power, and connect the outdoor antenna to the ground.

Normally, cloud discharges produce electromagnetic waves. Whereas, a lightning strike requires a direct discharge of electricity to an object.

Normally, the cloud discharge interferes with the radio waves, so the antenna should be grounded???

Attention should be paid to the use of walkie-talkies, and whenever the phone is turned on, it should be checked whether the channel used is correct to avoid unnecessary mistakes.

When using the walkie-talkie to talk, the walkie-talkie should be kept vertical, and the microphone should be 3-5 cm away from the mouth.

When using the walkie-talkie, the action should be light, do not use the antenna part of the walkie-talkie, which is likely to cause damage to the antenna and affect the call. It consumes a lot of power when it transmits, it consumes little power when it is answered, and it is necessary to save power when waiting. When charging, it is best to charge for more than 8 hours for the first time, otherwise it will affect the charging efficiency and battery life in the future.

Do not turn the computer on and off multiple times during the use of the procedure, and adjust the volume to a position that suits your hearing.

Only use original or approved antennas from Eurocom, as unapproved or modified antennas may damage the radio or violate the regulations of the Radio Regulatory Commission of the Information Industry.

The walkie-talkie wireless can not be unscrewed for use, otherwise its power tube will be easily damaged when transmitting. Do not use a damaged antenna, which may cause minor burns if it comes into contact with ** while transmitting.

The battery must be an original Eurocom battery or an approved battery, and should be charged in an environment of 5-40 degrees Celsius, if the temperature range is exceeded, the service life of the battery will be affected, and it may not be able to charge the rated capacity.

After the walkie-talkie is used for a long time, the key control knob and the case are easy to get dirty, please remove the control knob from the walkie-talkie, and clean the case with neutral lotion and a damp cloth. The use of chemicals such as stain removers, alcohol, aerosols, etc., can cause damage to the surface and housing of the radio.

Generally speaking, it's that frequency that's faulty, and the frequency of your walkie-talkie is being interfered with. You change the frequency and see if it will be. Otherwise, the numbers of your frequency are not exactly the same.

If there is a noise on the intercom, it may be that there is signal interference nearby, or it may be too far away.

It is an electromagnetic wave that is not part of the signal you want to receive. Because the sun and moon emit electromagnetic waves all the time (note that light is also a kind of electromagnetic wave), if you receive these unuseful electromagnetic wave signals, it will interfere with the signals you receive.

Radio waves that are close to or the same band as the radio wave you want to receive, but do not contain the information you need, are also received when you receive the desired radio wave, and after the receiver modulation and demodulation, this part will be interpreted as some sound being heard in the headphones.

Electromagnetic waves of a certain frequency, interference with electromagnetic waves in the corresponding frequency band.

Mainly from the sun, of course, when you are at home, there may be a stronger interference from electromagnetic waves emitted by a certain electrical appliance.

The noise here is not the noise of life.

It refers to the interference of electromagnetic waves of a certain frequency to the electromagnetic waves of the corresponding frequency band.

Let's say you want to accept a 77 Hz radio, and 88 Hz is noise.

Causes of noise on the radio:

1. Radio interference.

Generators, elevators, electric bells, electric welding, trams, automobiles, fluorescent lamps, electric fans, blowers, hair dryers and other electrical equipment will spark when in use, generating radio waves. If it is a noise generated by the above equipment, as long as you avoid using it with these devices at the same time, or away from these devices, the noise will naturally disappear.

2. Skypower interference.

The noise coming from the sky, which is caused by the discharge of electricity in the atmosphere, is called celestial electrical interference. On rainy days, when positively charged clouds and negatively charged clouds meet in the sky, thunder and discharge, and when the wind blows, it also causes electricity to be released into the atmosphere. When the electricity is discharged, there is a spark, and at the same time, radio waves are generated, which are transmitted to the radio, and a noise occurs.

The noise of the radio caused by the heavenly electricity is more common in spring and summer than in winter, and it is more severe in wet places than in dry places. Changes in the weather can not only cause noise and interference, but also damage the parts. Therefore, when a thunderstorm occurs, it is best not to listen for a while.

3. Internal failure of the radio.

If it is an internal fault of the radio, it should be further checked to see if the contact between the power plug and the power socket is compact; whether the power plug is rusty; Whether there is dirt in the tube socket, potentiometric switch, etc. In addition, components such as capacitors and vacuum tubes that are of poor quality or damaged can also cause noise, which must be sent to the repair department for inspection and repair, or the replacement of the components.

There will be noise when there is no signal, and there will be no noise when the signal is received.

Because the frequency modulation mode frequency discrimination circuit is in an irregular state when there is no signal, resulting in noise, there is a signal after the regular output of sound signal.

How to reduce the noise of the radio:

1.Listen near the outdoors, such as by the window, balcony, etc.

2.When listening indoors, household appliances such as computers, TVs, and fluorescent lamps will have an impact on reception, so turn off as much as possible if you don't need them.

3.Use a short-wave external antenna to enhance the reception effect.

4.If you are located in the downtown area of a large city surrounded by high-rise buildings, this also has a great impact on reception, and the use of short-wave external antennas may not be useful.

5.There is no need to make an external antenna, you still need to pay attention to the surrounding environment.

There are two main reasons for the noise of the radio: one is caused by external interference, such as lightning, electrical appliances, etc.; The other is caused by the internal failure of the radio, such as some parts are damaged or not soldered properly, and the current flow is affected.

Magnets produce magnetic fields. When it is close to the radio, it will affect the resonant frequency of the radio's frequency conversion coil, so that the local oscillation frequency of the radio will deviate, and the radio will change the channel by changing the local oscillation frequency. When the frequency of the local oscillator changes, the receiving frequency also changes, and the speaker produces noise.

1.The strength of the received signal is not enough or the signal amplification of the radio is not enough, and then the receiving antenna is desoldered or the antenna is not good enough;

2.There is an offset in the reception frequency of the radio, which may be a problem with the quality of production.

Hope it helps!

1.You've approached it with a magnet.

2.The membrane of the vocal pore is broken.

3.The signal is not good.

It seems to be related to the cosmic microwave background radiation.

Take your phone aside and remove electromagnetic interference or replace the radio line.

1. The main reason why there is sometimes noise on the car radio:

1. The channel is not adjusted well, resulting in a weak signal.

2. The radio antenna joint is loose and the contact is poor.

3. There is a film on the rear window of the car, and the antenna is damaged when the film is attached.

4. The sensitivity of the antenna itself is not high, and the receiving signal is not good, you can try to add an antenna signal amplifier.

5. The mobile phone is placed near the radio and interferes with it.

6. Interference of the engine ignition system, such as spark plugs and ignition coils.

7. Spark interference generated by generator commutators.

8. When other electrical equipment is working, it may interfere with the signal received by the radio, so there is noise.

9. The magnetic core of the inductance coil on the circuit board is loose, generally the power lead wire comes in series and has an inductance coil, usually almost all the power falls on this inductance coil when the machine is sleeping, if the core is loose, it is easy to produce noise.

10. Noise caused by electrostatic interference.

11. The quality of the lossless wiring harness is not good.

12. If there is a problem with the potentiometer to adjust the volume, you can try wiping the potentiometer with alcohol.

13. The tuner inside the radio was vibrated and loosened.

Second, the car radio sometimes has a murmur solution:

1. First see if there is a mobile phone next to the radio, and if there is, remove it.

2. Whether there is a film on the rear window recently.

3. Make sure that it is not a problem of your own frequency modulation.

4. Make sure that the radio line connector connection is solid and undamaged.

5. Remove static electricity: connect a grounding wire at the back of the car to see how the effect is.

6. Install a signal amplifier.

7. Replace the antenna.

8. Replace the wiring harness with good shielding effect.

At first, because the engine did not produce static electricity, and after a while of starting, static electricity was generated, and the whole car had static electricity, and when listening to the radio, static electricity would be generated, and the radio would have interference noise. So, if you want to solve the interference noise, first connect a ground wire behind the car and see how it works.

There are also times when adjusting the volume because the quality of the car radio is generally subpar, and this is because the potentiometer that adjusts the volume is a bit problematic. You just need to wipe the potentiometer with alcohol.

Check the replaced spark plugs, the cheap ones are easy to break down, and they have an effect on the current, so they will cause noise on the radio.

First of all, see if there is wireless interference around (such as wireless transmitting and receiving devices such as wireless walkie-talkies or *** transmitters plugged into cigarette lighters). See if the system current is too large, and some large currents will also produce noise.

If the current is too high, buy a rectifier.

Install the installation instructions on the items at both ends of the battery.

4. Someone is soldering electrical components with an electric soldering iron, and there is no change in current, so there is no electromagnetic wave generation, so 4 is in line with the topic

2. There is a change in the current when lightning occurs during a thunderstorm, so there are electromagnetic waves generated, which are received by the radio, so 2 does not conform to the topic

c. There is a changing current at the moment when the lamp is turned on, so there are electromagnetic waves generated, which are received by the radio, so Xiaomin is bored C does not meet the topic

d. There is a change in the current of the nearby welding machine in the bending work, so there is an electromagnetic wave generated, which is received by the radio, so D does not meet the topic

Therefore, choose 4