17th October 2019

diffen

15

Is AM or FM Better?

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In FM, a radio wave known as the "carrier" or "carrier wave" is modulated in frequency by the signal that is to be transmitted. FM is less prone to interference than AM. However, FM signals are impacted by physical barriers. FM has better sound quality due to higher bandwidth.

Hereof, what is AM radio mean?

AM stands for amplitude modulation, which means the amplitude of the radio signal is used to encode information. FM denotes frequency modulation, which uses a change in frequency to encode information.

What is AM radio frequency?

The Amplitude Modulated (AM radio) carrier frequencies are in the frequency range 535-1605 kHz. Carrier frequencies of 540 to 1600 kHz are assigned at 10 kHz intervals. The FM radio band is from 88 to 108 MHz between VHF television Channels 6 and 7.

Why do AM waves travel farther than FM?

Low frequencies travel farther mostly because they propagate along the surface of the earth. High frequency FM signals are basically line of sight. Under the right conditions, AM signals will bounce off of the ionosphere and can travel around the globe. This is not possible with high frequency signals.

1

What is the need for modulation?

Modulation. Modulation is an important step of communication system. Modulation is defined as the process whereby some characteristic (line amplitude, frequency, phase of a high frequency signal wave (carrier wave) is varied in accordance with instantaneous value intensity of low frequency signal wave (modulating wave.

2

What is the bandwidth of FM?

The frequency band for FM radio is about 88 to 108 MHz. The information signal is music and voice which falls in the audio spectrum. The full audio spectrum ranges form 20 to 20,000 Hz, but FM radio limits the upper modulating frequency to 15 kHz (cf.

3

How are radio waves used in television?

Radio waves have lower frequencies and longer wavelengths than microwaves. They are used to transmit television and radio programmes. Television uses higher frequencies than radio. A radio programme receiver does not need to be directly in view of the transmitter to receive programme signals.

4

What is the meaning of modulation index?

The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme. See: Amplitude modulation index. Frequency modulation index.

5

What is Los communication?

Line of sight (LoS) is a type of propagation that can transmit and receive data only where transmit and receive stations are in view of each other without any sort of an obstacle between them. FM radio, microwave and satellite transmission are examples of line-of-sight communication.

6

What is phase modulation in communication?

Phase modulation (PM) is a method of impressing data onto an alternating-current (AC) waveform by varying the instantaneous phase of the wave. Thisscheme can be used with analog or digital data. In analog PM, the phase of the AC signalwave, also called the carrier, varies in a continuous manner.

7

What is an FM radio station?

FM broadcasting is a method of radio broadcasting using frequency modulation (FM) technology. FM broadcasting is capable of better sound quality than AM broadcasting, the chief competing radio broadcasting technology, so it is used for most music broadcasts. FM radio stations use the VHF frequencies.

8

What technologies use radio waves and microwaves for communication?

Both have communication uses. Radio waves are used to transmit television and radio programmes, while microwaves are used for mobile phones and Wi-Fi. However, they have different properties: Radio waves have longer wavelengths and are reflected by the ionosphere (part of the Earth's atmosphere).

9

How do we use radio waves to communicate?

Electromagnetic radiation can be used for wireless communications.

Radio waves. Radio waves are used to transmit television and radio programmes.
Microwaves. Microwave radiation can be used to transmit signals such as mobile phone calls.
Infrared.
Visible light.

10

What kind of waves do cell phones use to transmit and receive signals?

Cellular (cell) phones operate with radio frequencies, a form of electromagnetic energy located on the electromagnetic spectrum between FM radio waves and the waves used in microwave ovens, radar, and satellite stations. Cell phones do not emit ionizing radiation, the type that damages DNA.

11

Do cell phones use radio waves or microwaves?

Cellular (cell) phones operate with radio frequencies, a form of electromagnetic energy located on the electromagnetic spectrum between FM radio waves and the waves used in microwave ovens, radar, and satellite stations. Cell phones do not emit ionizing radiation, the type that damages DNA.

12

What kind of waves do cell phones emit?

There are three main reasons why people are concerned that cell phones (also known as “mobile” or “wireless” telephones) might have the potential to cause certain types of cancer or other health problems: Cell phones emit radiofrequency energy (radio waves), a form of non-ionizing radiation, from their antennas.

13

Can you get eye cancer from cell phone?

The eyes also have cells that produce melanin. Melanoma of the eye is rare. The issue of whether long-term use of cell phones can cause cancer, in particular brain tumors, has been a hot topic, but most studies examining the matter have found no such association.

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Can cell phones cause brain cancer?

(Something that causes cancer or helps cancer grow is called a carcinogen.) The IARC has classified RF fields as “possibly carcinogenic to humans,” based on limited evidence of a possible increase in risk for brain tumors among cell phone users, and inadequate evidence for other types of cancer.

15

Can you get cancer from WIFI?

There still aren't any good explanations for how mobile phones could cause cancer. The radiofrequency electromagnetic radiation they transmit and receive is very weak. This radiation does not have enough energy to damage DNA, and cannot directly cause cancer.

16

Do cellphones cause brain tumors?

After evaluating several studies on the possibility of a connection between cellphones and glioma and a noncancerous brain tumor known as acoustic neuroma, members of the International Agency for Research on Cancer — part of the World Health Organization — agreed that there's limited evidence that cellphone radiation

17

Can you get breast cancer by putting your phone in your bra?

Keep That Cell Phone Out of Your Bra. The ways some people are using their phones today could increase their risk of developing breast cancer and other diseases tomorrow. Cell phone's microwave radiation seeps directly into soft fatty tissue of the breast.

18

How can I protect myself from cell phone radiation?

15 Ways To Protect Yourself From Your Cell Phone

Keep your distance. Do not keep your cell phone next to your body or in your bra.
Talk on speaker. Holding a cell phone to your ear also exposes your salivary glands to EMFs.
Turn your phone off more often. No radiation is emitted when the device is off.
Consider alternatives.

19

What materials can block radiation?

The high density of lead (11.34 grams per cm³) makes it a useful shield against X-ray and gamma-ray radiation. Lead, in its pure form, is brittle and cannot be worn as apparel. To transform pure lead into a wearable radiation shielding material it's mixed with binders and additives to make a flexible lead vinyl sheet.

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How can I protect my phone from falls?

Steps

Pay attention as to where you place your phone.
Be careful where you use the phone.
Stay off the toilet when using your phone.
Put a durable and non-slip cover over the phone.
Train yourself to get into the good habit of putting the phone back after each call.
Recharge the phone in a safe and secure spot.

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