"Pearl River Radio"PR-1312 AM/FMTwo-band portable radio
Pearl River RadioExtraordinary qualityFrom professional	Introduction to the machine
2Band portable AC and DC radio. FM/Two bands of amplitude modulation High sensitivity,High letter to noise ratio 4Inch loudspeaker,Beautiful tone. Portable handle design AC and DC power supply Three batteries Popular design/Elegant and beautiful Adopt advanced integrated circuits Use whip antenna. Knob tuning/Turn up the volume/switch	Zhujiang brand radio has been manufactured for decades, popular old brand, traditional style, as always classic and original, focused on professionalism, simple and elegant, and easy to operate, providing more and better quality products for the majority of broadcasters
	Frequency Range
	Product specifications: FM:88-108 AM:525-1605
	Output Power
	maximum:450mW Rated:200mW
	Power supply
	power supply:DC4.5V1Battery3Section AC220VPower consumption:0.5W
	Specification, weight
	size:245X135X84Xmm weight:930g
easy to use/High sensitivity/Elegant and beautiful/Loud volume Native support for communication220Vor3Save large electric power supply, send to the elders\Choice for leisure and entertainment.

Common problems and solutions of Zhujiang Radio:

1: Televisions, computers, cameras, induction cookers, fluorescent lamps, silicon dimming desk lamps, car engines, electric motors and other electrical equipment have strong radiation interference to the radio''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s medium wave and short wave. When using the radio, please keep it with the above appliances A certain distance to avoid interference.

2: The interior of the steel-reinforced building and the high-rise buildings around the listening location have a certain shielding effect on the broadcast signal. Using the radio near the window can improve the receiving effect.

3: The mobile transmitter tower signal near the listening location will seriously interfere with the listening of shortwave and TV sound. Try to shorten the length of the whip antenna and adjust the angle, and at the same time, change the different listening positions to improve the receiving effect.

4: The easiest way to improve the shortwave reception capability is to add a simple external antenna to the radio, that is, use a 3-4 meter long wire with one end wrapped around the whip antenna and the other end hanging outside the window. The higher the effect, the better.

5: Listening advice: When buying a radio, be sure to pay attention to your geographic location

a: There are many FM radio stations in the city, you can buy FM stereo radio

b: In mountainous areas and rural areas far away from cities, due to distance, it is often impossible to listen to FM, FM stereo and TV audio programs, so buy a radio with high sensitivity for medium wave and short wave

Special warning: Never install an outdoor external antenna in a thunderous area!

How to care for the radio?

1. How does the radio prevent dust?

  Dust can enter the machine through the small hole on the radio speaker. After a long time, it will inevitably affect the sound effect of the speaker, especially in public places with a lot of dust. This problem is particularly serious, so it is necessary to talk about this problem:

1. Try to listen in a clean place as much as possible. If you are at home, don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t put the radio in the living room or near the window or door.（The antenna can be made longer）When you don’t listen, it’s best to put it in a cabinet or other closed things, and then take it out when you listen. If you find it too troublesome, you can cover it with a paper box（It’s more troublesome to use something like a TV cover, and it’s easy to wear the case）, Or just put it in a paper box, the dust will never invade（Note that the boxes should not be placed randomly, it is better to put them in a clean place）. But it is best to put it in the cabinet when cleaning the house.
2. When you take it out to listen, it’s best to add a leather case, put it in your pocket and listen with headphones, so as to prevent the intrusion of dust.（Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t be stingy with your holster, drill a small hole）.
3. If there is a sudden rise, it depends on watching and rubbing, then make sure that the surrounding environment is very clean, and it is best to clean it with a small brush after finishing.（Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t break the circuit）.

How does the radio prevent wear and tear?

1. Do not frequently pack it in the original box and the original plastic packaging. These things are relatively tight and easily scratch the case. If it is a dust-proof box, it should be looser. Do not choose and A box about the same size as the machine, a bigger one is better.
2. Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t frequently put in and out in the leather case, unless you are going out（Of course R101 can be listened normally in the leather case）.
3. The radio should be placed on a flat, smooth but not too slippery surface（You can put a piece of paper or something on the table first, and put it on the paper, or other softer things.）, The hard surface will wear down the bottom of the radio（Who can say that he is holding it with both hands and placing it on a table or something at an angle completely perpendicular to the horizontal, so it is best to keep the contact surface not very hard.
4. When holding it, don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t hold it too tightly, as this will compress the case, and don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t be too loose. Sliding will also cause wear. It is best to place it flat in your hand.

How the radio is shock-proof

This question is relatively simple. Just one word is "light". How light is it? Just a little lighter than your own glasses. When holding and releasing, the movement should be light, and it should be placed in a relatively stable place without vibration.（First stabilize the bottom of the furniture.）. Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t run to listen（No matter how good the quality of the radio is, it’s better not to be like this）, It’s best not to listen when riding, not only for the radio, but more importantly for safety.

Four other issues
1. Don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t put it in a room with direct sunlight, especially in summer, where the temperature is very high, and don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t place it in a humid room with poor air circulation. The parts are easy to rust in an environment with high humidity for a long time.
2. For the maintenance of the antenna, if there is an external antenna, connect it directly to the whip antenna. If the whip antenna can be used less, use it less. When the screw of your radio whip antenna is loose, you can use your hand to support it. Know the correctness of doing so.
3. For the maintenance of the earphones, don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t overwhelm the earphone cable arbitrarily, make sure the cable is stretched and smooth, don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t pull it, if you want to put it away（For example, if you are going on a business trip for 1 month, you don’t need this headset）, Should be gently folded along the original crease, not too strong, and finally use the original small Dongdong who strapped the earphones（iron wire?）Gently pull it, don’t pull it too tight, just make sure it won’t break away by itself, actually just make a circle, there is no need to tighten it too much. Also, if the headphone cord is often in contact with hands or skin that is not too clean, especially sweat, the headphone cord will easily become dirty and hard. My earplugs have been used like this for two years, and the cords are still as soft as ever, indicating that this is still somewhat useful.
4. For some maintenance of the external antenna, it is best to install it close to the wall to prevent rain as much as possible. For safety, a lightning protection device should be installed, and the fixing should be relatively firm to avoid the influence of wind.

Pay attention to the following when using the radio:
1. When using dry batteries, do not install the polarity reversely. After replacing the batteries, replace all the original batteries.
2. When rotating the switches and the rod antenna, do not move too hard to avoid twisting the switch and breaking the antenna.
3. When looking for a station, you can turn the tuning knob and move around the station until the sound is loudest and clearest.
4. The radio has a certain directionality. When the reception effect is not good, you can rotate the body or change the position to get the best reception effect.
5. When a radio with stereo function is receiving a stereo program, it should be adjusted until the stereo indicator light turns on to hear a satisfactory stereo effect.
6. When connecting speakers or earphones, pay attention to impedance matching, so as not to affect the listening effect and damage the radio.
The radio should be noted in the usual maintenance:
1. The radio should be placed in a dry and ventilated place, and cannot be dropped or touched. Be dust-proof and avoid direct sunlight.
2. After the radio is inadvertently flooded with moisture, it must be put in a ventilated place and dried thoroughly before it can be energized. It should not be exposed to sunlight or dried.
3. When not in use for a long time, the battery should be taken out to prevent the battery from leaking and corroding the parts. It is best to be energized and used once regularly.
4. The radio should be cleaned regularly. Wipe gently with a dry cloth when cleaning, and do not wash with water.
5. Do not change the position of the adjustable components in the radio at will.

Which band of radio waves are used for radio broadcasting and television? How are they spread?

At present, AM radio broadcasting is divided into three large wave bands: long wave, medium wave and short wave, and the signals are respectively transmitted by radio waves in the corresponding bands. my country has only two large-band radio broadcasts, medium wave and short wave. The frequency band used by medium wave broadcasting is roughly 550kHz1600kHz, which mainly relies on ground wave propagation, accompanied by some sky waves; the frequency band used by shortwave broadcasting is about 2MHz-24MHz, which mainly relies on sky waves to propagate, and is accompanied by ground waves at close range. FM radio broadcasts mostly use ultrashort wave (VHF) radio waves to transmit signals, using frequencies of about 88MHz-108MHz, mainly relying on space waves to transmit signals. At present, terrestrial broadcast and television are divided into two frequency bands: VHF (VHF or Meter Wave) and UHF (Ultra High Frequency or Decimeter Wave). In my country, the frequency range used by VHF band TV is 48.5MHz-3MHz, divided into channels 1-12, and the frequency range used by UHF band is 470MHz-956MHz, divided into channels 3-68. They basically rely on space waves to propagate. There are 6 frequency bands for satellite broadcasting and television in the international regulations, the main frequency band is 12kMHz, which is also propagated by space waves.

【AM/FM introduction】What is an amplitude modulation wave? What is FM wave?

The modulation method that changes the carrier amplitude according to the modulation signal is called amplitude modulation. The amplitude-modulated radio waves are called amplitude-modulated waves. It maintains the frequency characteristics of the high-frequency carrier, but the shape of the envelope is similar to the signal waveform. The amplitude of the amplitude modulation wave is determined by the intensity of the modulation signal. The amplitude modulation wave is represented by the English letter AM. The modulation method that changes the carrier frequency according to the modulation signal is called frequency modulation. The magnitude of the frequency change of the modulated wave is determined by the size of the modulation signal, and the period of the change is determined by the frequency of the modulation signal. The amplitude of the modulated wave remains unchanged. The waveform of the FM wave is like a spring that is compressed unevenly. The FM wave is represented by the English letter FM.

What is a TV-accompanying radio?

The TV sound (TV SOUND) uses the FM system, and the transmission method is the same as FM broadcasting, which is also short-distance transmission. TV audio is divided into two sections, VHF and UHF, among which: VHF: Channel 1-12 (subdivided into VHF-L 1-5 and VHF-H 6-12) UHF: Channel 13-56. The current TV-accompanying radios mainly receive VHF channels 1-5 and 6-12, and rarely receive radios above channel 13 (UHF).

What is campus radio?
Campus broadcasting is a kind of low-power FM broadcasting. Many colleges, universities, middle schools and even elementary schools have now adopted a large number of campus FM broadcasting methods to broadcast English programs or other programs. The frequency range is usually between 76-87MHz, which means that ordinary The TV-accompanying radio can be received. Now some FM radios directly extend the frequency to 76-108MHz, which can meet the needs of listening to campus radio.
What does the full band of the radio mean?

The full band is also three bands: FM fm, medium wave am（mw）, Shortwave sw. fm is generally 87-108mhz, with campus broadcasting can reach 64-108mhz; am is generally 520-1650khz; sw is generally 5-21mhz（Maximum 2-29mhz）For the convenience of use, this frequency band is often divided into several small frequency bands, and sw1, sw2, …… may appear on specific radios. So there is a so-called 9-band or 12-band radio（fm+am+n sw）.

What is Frequency Modulation (FM), Amplitude Modulation (AM), Short Wave (SW), Long Wave (LW)?

There are AM and FM bands on general radios or radio tape recorders. I believe you are already familiar with them. These two bands are used to listen to domestic broadcasts. If there is SW band on the radio, in addition to domestic shortwave radio stations , You can also listen to radio programs from all over the world. In order to give you a better understanding of the use of the radio, the following is a brief description of what are AM, FM, SW, and LW. In fact, AM and FM refer to two different modulation methods in radiology. AM: Amplitude Modulation is called amplitude modulation, and FM: Frequency Modulation is called frequency modulation. It''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s just that general medium wave broadcasting (MW: Medium Wave) uses amplitude modulation (AM). Unconsciously, MW and AM are equal. In fact, MW is just a kind of broadcast that uses AM modulation. For example, the modulation method used in high-frequency (3-30MHz) international shortwave broadcasting is also AM, and even higher frequency aviation navigation communications than FM broadcasting (116- 136MHz) is also the AM method, but the AM band we call daily refers to the medium wave broadcasting (MW）. What about FM? It is also similar to the fate of MW. We are used to using FM to refer to general FM radio（76-108MHz, 87.5-108MHz in my country, 76-90MHz in Japan）In fact, FM is also a modulation method, even in the shortwave range of 27-30MHz, as the band for amateur radio, space, satellite communication applications, FM is also used（FM）Way. And SW? In fact, it can be said to be a simple term for shortwave. The correct term should be high frequency (HF: High Frequency) which is more appropriate. And how did the name shortwave come from? In terms of wavelength, the medium wave (MW) is between 200-600 meters (meters), while the wavelength of HF is between 10-100 meters (meters). Compared with the above-mentioned wavelengths, HF The wavelength is indeed shorter, so HF is called short wave (SW: Short Wave）. Similarly, the frequency spectrum between 150KHz-284KHz, which is lower than the medium wave MW, is also used for broadcasting. In terms of wavelength, it is approximately between 1,000 and 2,000 meters (meters), and the MW is 200- Compared with 600 meters, it is obviously "longer", so the broadcasting of this frequency spectrum is called Long Wave (LW: Long Wave). In fact, no matter long wave (LW), medium wave (MW) or short wave (SW), AM modulation is adopted. For general radios (recording), the FM, MW, and LW bands are for you to listen to domestic broadcasts, but there is currently no LW radio station in my country, while the SW band is mainly for you to listen to domestic/international long-distance broadcasts.
.Band characteristics: Amplitude modulation (medium wave) to listen to local radio programs; FM (FM) to listen to local radio programs; FM stereo (FM STEREO) to listen to local FM stereo radio programs; shortwave (SW) to listen to domestic and international long-distance radio program.

Use of 3m or 5m extension cord: It is convenient to put the radio on the bedside, roof, terrace, garden, door, etc. where there is no socket, plug in the power cord to listen, distance is no longer a problem.