How far can a 9db antenna reach?

How far can a 9db antenna reach?

The U.S. Robotics 9dBi Directional Panel Antenna was designed to deliver a broad, focused signal for 802.11b and 802.11g wireless access points, bridges and routers. It is outdoor-rated so it can support applications outside of buildings. This 9dBi high- gain antenna can deliver links of up to one kilometer.

What is RF in antenna?

(Radio Frequency in) Refers to coaxial sockets on the back of older TVs, VCRs and DVDs that accepted analog video signals. The “RF in” socket is typically receiving VHF/UHF signals from an antenna.

How long is a 900 MHz antenna?

approximately 16.6cm

In the 900 MHz range, this equals approximately 16.6cm (a full wavelength is 33.3cm). Resonance within the dipole antenna occurs at the length where there is no electrical reactance.

How does frequency affect antenna size?

The length of the antenna is inversely proportional to the frequency and directly proportional to the wavelength. The higher the frequency and the shorter the wavelength, the shorter the antenna can be made.

How far can 12dBi antenna reach?

It provides a high-gain, 120-degree sector coverage that can reach up to 1.86 miles, and can be combined with additional antennas for a full 360-degree covered network. The antenna’s u-bracket can tilt up to ten degrees for direct line of sight coverage or to reduce interference.

How far will a 8dbi antenna reach?

Antenna Basics

What is the range of RF antenna?

Radio frequency (RF) is a measurement representing the oscillation rate of electromagnetic radiation spectrum, or electromagnetic radio waves, from frequencies ranging from 300 gigahertz (GHz) to as low as 9 kilohertz (kHz).

How far can RF travel?

Thus the typical ranges with around 400 MHz frequency range with 1 W transmitter power are up to ~30 kilometers and up to ~80 kilometers with 10 W transmitter power. See sample picture of a RF link functional factors at the end of this document.

What band is 900 MHz?

The 900 MHz band (896-901/935-940 MHz) encompasses 10 MHz of spectrum that is used by many utilities, refiners, railroads and other critical infrastructure operators in the United States, primarily for two-way voice communications.

Will a 2.4 GHz antenna work for 900mhz?

1 Answer. The wavelength, and hence the antenna design for 2.4 GHz is ~12.5 cm, but the wavelength for 900 MHz is ~33 cm. There would be a number of issues, including poor impedance match and decreased radiation efficiency, with an unknown radiation pattern.

How do I choose an RF antenna?

5 Things You Need to Consider When Choosing a New RF Antenna

1. RF Antenna Technologies. Antennas communicate with each other using radio waves created by an electric current.
2. Gain and Losses.
3. Efficiency and Performance.
4. Voltage Standing Wave Ratio (VSWR)
5. Testing for Sensitivity.

What is the highest frequency antenna?

UHF television antenna on a residence. This type of antenna, called a Yagi-Uda antenna, is widely used at UHF frequencies.
…
Ultra high frequency.

Is higher antenna gain better?

On an open and flat highway, a high gain antenna will be better… 3 dB, 6 dB, etc. If your desired coverage area is hilly then a ¼ wave omnidirectional antenna will be better. The other type of gain is directional and is important for base stations.

How far will a 16dBi antenna reach?

16dBi Yagi: Long Distance (30-70km) or Flat Areas (hills > 15km away).

What is the range of 12dBi antenna?

Provides 12dBi directional operation for point-to-point, high performance and long range connections. Works with N Type female connector.
ANT-2412D1.

How far can a 15 dBi antenna reach?

Using a 15 dBi Omni-directional antenna, the high gain will project the WiFi signal way above the required 400 ft coverage, and will give better signal for people far outside the garden.

How far can 900 MHz reach?

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.

What RF frequencies are harmful to humans?

Despite the advent of numerous additional research studies on RF fields and health, the only established adverse health effects associated with RF field exposures in the frequency range from 3 kHz to 300 GHz relate to the occurrence of tissue heating and nerve stimulation (NS) from short-term (acute) exposures.

How far can 900 MHz travel?

Is 900 MHz unlicensed band?

For wide-area communications, the primary unlicensed bands used are 900 MHz (868 in Europe, 915 in the US) and 2.4 GHz. These unlicensed bands are free to use, but are subject to regulations and the potential interference of competing wireless signals.

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.

Can an antenna be too big?

A bigger antenna, properly designed, will always have more gain than a smaller one. And it will be the best kind of gain, much better than using a small antenna and simply overamplifying it, because a small antenna just won’t pull in truly weak signals like this gigantic one will.

Is a longer antenna better?

Longer antennas have lower frequencies and higher bandwidths. This means signals can travel over longer distances. Radio stations operate at lower frequencies and their signals can easily connect to longer antennas.

Which antenna gives highest gain?

Directional antennas provide increased performance over dipole antennas—or omnidirectional antennas in general—when greater concentration of radiation in a certain direction is desired.

What is the best gain for antenna?