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What is LNB?
The LNB (Low Noise Block Down-Converter) is part of the receive chain of yourVSAT. Located on the feed horn, the LNB converts the satellite signal that was reflected off of the satellite antenna’s reflector fromC-Bandinto anL-Band signal. The L-Band signal is in the frequency range of 950 to 1750 MHz and is considered more manageable. This is partially due to the fact that the transmission of the lower frequency signal can be more reliable when using a coaxial cable than is the case when higher frequency C-Band signals are transmitted of on this type of cable. Virtually all new satellite routers today use L-Band inputs. An LNB can be identified by its F-type output connector.BY AUQIB KHAN
Which is used for longer distances amplitude modulation or frequency modulation?
Long-distance radio communication Amplitude Modulation (AM) is the answer, because Frequency Modulation (FM) works at frequencies greater than from 50 MHz and can only be used for line-of-site communication, although it can be used to communicate for long distances into space. For long-distance communication, AM and Single-sideband (SSB) modulation can be used in the high-frequency (HF) range in the region of 30 MHz, but the distance is limited to about 30 to 100 kilometers. If ionospheric conditions are good, however, communicating with someone at the opposite side of the globe is possible, because radio signals bounce off the ionosphere back to the Earth and then back to the ionosphere. This phenomenon is called "skip." If you desire continuous long-distance communication, you need to use the lower band of the RF spectrum: long-wave, medium-wave or short-wave signals. With AM, these frequency ranges are not affected by obstacles like mountains or buildings and are called ground waves, because they follow the contour of the Earth. Hence, with enough power and a good directional antenna, it is possible to communicate around the Earth. The only problem is Static-interference (QRM) on the received signal that can make clear communication next to impossible. Sunspots and other sun activities can also affect this type of communication and can even blank out communication totally, a phenomenon known as "radio silence."
On a Motorola portable radio what is the difference between channel and frequency?
Not only on Motorola Portable radio, but in all radio communications: Frequency is number of cycles (full change circles) per second. When radio device operates on some frequency it requires band of adjacent frequencies to be able to transmit modulation (information) too. To avoid mixing, next transmitter must take some "distance" (higher or lower frequency) far enough from frequency of the first one. According to regulations basic frequencies are "named". Channel number is the name of its frequency given by communication regulations. For example, TV UHF channel 21 takes all frequencies from 512 to 518 MHz (megahertz), channel 22 from 518 to 524 MHz, and so on... CB Radio channels 21 and 22 occupy frequencies from CB band, not from TV band. Tables of channel frequencies within various bands can be easily found by search engines.
How old do you have to be to sign up for American Idol?
The eligible age-range for contestants is currently 15 to 28 years old. The initial age limit was 16 to 24 in the first three seasons, but the upper limit was raised to 28 in season four, and the lower limit was reduced to 15 in season ten. See related link
What is ture of the relationship between frequency and wavelength?
Wavelength lambda and frequency f are connected by the speed c of the medium. c can be air = 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s. c can be light waves or electromagnetic waves = 299 792 458 m/s. The formulas are: c = lambda x f f = c / lambda lambda = c / f
What is up converter in satellite communication?
Every information sent and received through satellite communication has to have an address to enable the communication process of signal delivery and reception. This naming of the signal is made in the form of a specific frequency. For example each TV channel operates on a unique frequency of it's own. When that frequency is called (tuned technically) out of a spectrum in that band, the chosen frequency gets selected. Since satellite transponders operate at very high frequency, modulation of the signal on to the carrier is difficult. Hence modulation is carried out at a much lower frequency. Such modulated signal is raised to the required frequency( name or address as stated above) that supports the satellite band and the transponder. The equipment used to elevate the frequency of the low frequency carrier (known as Intermediate Frequency) to the satellite transponder frequency is UP CONVERTER C.K.Vasudeva Bangalore
What is signal bandwidth?
Every line has an upper limit and a lower limit on the frequency of signals it can carry. This limited range is called the bandwidth. The signals ranging within the upper limit & lower limit are called bandwidth signals.
What is microwave satellite communication?
It is communication with a satellite orbiting the planet using microwaves, a type of electromagnetic wave of lower frequency than light but higher frequency than radio waves. Microwaves are often used in this way as they can penetrate the earth's atmosphere, but can travel a long enough distance to reach the satellites, unlike x ray waves.
What are infrasound?
Just like "infrared" is light that we can't see because its frequency is lower than the frequency of red light, "infrasound" is vibration or waves in air that we don't hear, because its frequency is lower that the lower limit of human sound perception.
What is the correct terms when describing the frequency range of 3 kHz to 300 GHz?
Electromagnetic Frequency (EMF) & Radio Frequency (RF)
In electronic communication system describe the upper side frequency and the lower side frequency?
errrrrrrrrr electrictiy, doesnt that come from the wall?????
When do you have an ultra sound?
Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. This frequency varies from person to person, it is approximately 20 kilohertz (20,000 hertz). This is the lower limit in describing ultrasound.
What is the mode of grouped data?
To calculate the mode.. Add the lower limit and upper liit of the class interval with the most frequency. :)))
How the capacitor set lower cutoff frequency limit?
A capacitor totally blocks DC current (it's an open circuit to it). The higher the frequency, the less resistance (impedance) the capacitor has.
What is the lowest natural frequency of sound is?
The lowest natural frequency of sound is around 20 Hz, which is the lower limit of human hearing. Frequencies below this threshold are considered infrasound.
What is the relation between pitch and frequency?
the lower the frequency the lower the pitch; higher pitch lower frequency
What waves have lower frequency?
Radio waves have lower frequency compared to visible light, ultraviolet light, and X-rays. This makes them suitable for long-distance communication because they can travel through obstacles and the atmosphere with less attenuation.
