Users' questions

Who uses 900 MHz band?

Who uses 900 MHz band?

As the FCC explains in a press release, the 900 MHz band is “currently designated for narrowband land mobile radio communications and primarily used by land transportation, utility, manufacturing and petrochemical companies.”

What is the 900 MHz band used for?

The 33-centimeter or 900 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio on a secondary basis. It ranges from 902 to 928 MHz and is unique to ITU Region 2. It is primarily used for very local communications as opposed to bands lower in frequency.

Why UHF 900 MHz band is commonly used in cellular communication?

There are two reasons why 900 Mhz is superior to the 1800 Mhz band. The first is because laws of physics state that the higher you go on the frequency band, the lower will be the wavelength. Simply put signals sent out using higher frequency bands will travel lesser distance than signals sent on a lower frequency band.

Which is better 900 MHz or 2.4 Ghz?

The 900MHz radio system is at a lower frequency and will penetrate surfaces more easily. Tempest 2.4GHz systems are more reflective and tend to be affected more by bodies, foliage, or moisture that can attenuate the signal.

Is 900 MHz dangerous?

The Electromagnetic Fields (EMF) emitted by mobile phones has the potential to heat up human tissue in the head locale where the telephone is squeezed against. Studies have shown that, chronic prenatal exposure to 900 MHz EMF caused pyramidal cell loss in the hippocampus of new-born rats [7].

How far can 900 MHz travel?

The lower frequency radio waves of 900 MHz radios provide greater penetration through walls, trees and other obstacles, making it optimal for most non-line-of-sight applications. A typical AW900xTR Radio using high powered AW-15 15dbi antenna can go distances of up to 1500 feet with buildings and/or trees in the way.

Is 5 GHz faster than 2.4 GHz?

A 2.4 GHz connection travels farther at lower speeds, while 5 GHz frequencies provide faster speeds at shorter range. A lot of electronic devices and appliances use the 2.4 GHz frequency, including microwaves, baby monitors, and garage door openers.

Does 2.4GHz require line of sight?

Radio transmission requires a clear path between antennas known as radio line of sight. It is necessary to understand the requirements for radio line of sight when designing a network operating in the 2.4Ghz or 5.2/5.8Ghz ISM band. Line of sight is the direct free-space path that exists between two points.

How much MHz is safe?

The most restrictive limits on whole-body exposure are in the frequency range of 30-300 MHz where the human body absorbs RF energy most efficiently when the whole body is exposed.

What can block frequency?

Materials that Block Radio Waves

  • Wood.
  • Ceramic.
  • Paper.
  • Plastic.
  • Teflon.

Is 900 MHz a line of sight?

Are there other users in the 900 MHz band?

Taking a look at the 900 MHz band and it’s other users The largest concern with coordinating amateur systems on 900 MHz may be and potential of interference to primary and secondary users. Part 97.303. Frequency sharing requirements spells this out: (g) In the 33 cm band:

Is the 900 MHz band a secondary allocation?

900 MHz is a “new band” for a lot of folks, and many are unaware that amateur radio is a secondary allocation in that spectrum.

How much power can a 900 MHz base station transmit?

• Telefónica and Vodafone have also requested that we vary their 900 MHz Public Wireless Network licences so as to increase the maximum permitted base station transmit power by 3 decibels (3dB) for 3G use (the “power increase licence variation requests”).

What kind of radio can you use on 33 centimeter band?

Amateurs who use local repeaters on the 33 centimeter band use commercial handheld or mobile 900 MHz radios. As shown above, these radios can transmit between 896 and 902 MHz and receive between 935 and 941 MHz.

What kind of devices use the 900 MHz band?

Other ISM devices include; RF lighting systems, paint dryers, jewelry cleaners, industrial microwave ovens, and MRI equipment. Most ISM energy is centered at 915 MHz. The FCC opened the industrial, scientific and medical (ISM) bands to Part 15 radio users in 1985.

What are the band numbers for 700 MHz?

B13 (700) is Band 13 on 700 MHz. B17 (700) is Band 17, on 700 MHz. B18 (800) is Band 18 on 700 MHz. B19 (800) is Band 18 on 800 MHz.

900 MHz is a “new band” for a lot of folks, and many are unaware that amateur radio is a secondary allocation in that spectrum.

Are there any unlicensed radios in the 915 MHz band?

Radios operating in the 915-MHz ISM band are subjected to interference from other unlicensed devices in the same band which could significantly degrade the operating radio’s sensitivity.