Magnetic field strength next to the communication base station battery

The owner of a mobile telephone is exposed to radiation from both the mobile telephone and base stations. They are often installed on the roofs of residential buildings. The article deals with electromagnetic. [pdf]

FAQS about Magnetic field strength next to the communication base station battery

What is the density of electromagnetic field generated by mobile communication base stations?

The density of flux from electromagnetic field generated by mobile communication base stations is 1.2–1.4 μW/cm 2. This is nearly 10 times below the level authorised in our country.

What is the maximum field strength of electromagnetic radiation?

In accordance with the European Commission’s Recommendation adopted on 12 July 1999, the maximum field strength of electromagnetic radiation (0–300 GHz) is required to be established to supply information about population exposure to electromagnetic fields and measures taken to reduce it.

What is the relation of electric to magnetic field strength?

During investigations, the ratio of electric to magnetic field strength became equal to 377 at a distance of 18 m from mobile communication. This ratio did not change with increasing distance from the antenna, indicating that the formed electromagnetic wave continued spreading.

What is the authorized value for electromagnetic field density?

The values of the density of flux from electromagnetic field at up to 20 m distance range from 0.01 μW/cm 2 to 0.1 μW/cm 2 and are by 100–1000 times below the authorised value. Therefore, concerns about health safety near the base station tower are ungrounded.

What is the density of electromagnetic field energy flux under a base station?

The values of the density of electromagnetic field energy flux density under the base station antenna are very low. At up to 20 m distance, they range from 0.01 μW/cm² to 0.1 μW/cm² and are 100–1000 times below the authorised value.

What is the electric to magnetic field strength ratio at 18m?

During investigations, the electric to magnetic field strength ratio became equal to 377 at a distance of 18 m from mobile communication. For air Zb = 120 π Ω = 377. As the performed investigations have shown, when a distance from the mobile communication antenna grows, the relation of electrical and magnetic field with the antenna becomes weaker.

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Why do base stations all use 48V power

Products basically use -48V power supply system, and the actual measured voltage is generally –53.5V. This is because for reliability reasons, communication equipment is equipped with a backup battery (-48V). [pdf]

FAQS about Why do base stations all use 48V power

Why do we use 48V power supply?

The choice of 48V was to maximize the distance between the user and the end office under the conditions at the time (36V is a safe voltage, and it is unsafe to exceed too much). Later, in order to be compatible with early equipment and reduce costs, the central office communication equipment still used -48V power supply.

Can a 48 volt DC power supply save a data center?

(Fig. 5) As shown in this example, when the power per rack exceeds 10 kW, the power distribution loss generated by traditional 12-V DC power is said to reach an intolerable level, but a 48-V DC power supply significantly contributes to power saving for a data center.

Why is 48 a good system voltage?

Back in the day, when Telephony equipment was being developed, 48 was the chosen system voltage because it’s considered safe “low voltage”, and reduced amperage requirement of equipment powered at this voltage.

What is the operating voltage range for -48V system equipment?

For -48V system equipment, the required operating voltage range is -38.4V ~ 57.6V, but in fact we generally require the operating range -36V ~ -72V. The main consideration is that -48V system equipment must be compatible with –60V power supply system, which requires –48~-72V.

Can a 48-V DC converter be used with a 12-V DC power supply?

When a 48-V DC power feeding is adopted, the power configuration of the DC/DC converter needs to be changed from the 12-V DC power supply. Briefly described, two methods are used. The single-stage method reduces the 48-V power source to the load voltage by using a single power supply.

Why did Bell choose -48VDC?

In the late 1800’s, most homes of were not yet wired for electricity; in fact, communications beat power to the home in much of the United States. The reason Bell selected -48VDC is because it provides enough in power to support a signal, but not enough to be dangerous.