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Provide a list and brief description of the five frequency bands which are used by satellites to transmit and receive signals?

L-band--1.5-2.7 GHz S-band--2.7-3.5 GHz C-band--3.4-6.7 GHz Ku-band--12-18 GHz Ka-band--18-40 GHz


Why channel spacing is 200khz in gsm?

Simply because of the band-width required to transmit and receive calls. If the channel spacing was narrower - they'd need to reduce the band-width - which would reduce the amount of data they could transmit.


What does LNB stand for on a satellite system?

Answer: A satellite dish is a parabolic antenna designed to receive microwave signals from communications satellites, which transmit data transmissions or broadcasts, such as satellite television. In home based systems, the parabolic shape of a dish reflects these signals to the dish's focal point. Mounted on brackets at the dish's focal point is a device called a feedhorn. The feedhorn is essentially the front-end of a waveguide that gathers the signals at or near the focal point and 'conducts' them to a low-noise blockdown converter or LNB. The LNB converts the signals from electromagnetic or radio waves to electrical signals and shifts the signals from the downlinked C-band (older generation of satellite signals requiring 10 to 12 foot dish diameters) or Ku-band (current generation of satellite signals requiring 10 to 12 inch dish diameters) to the L-band range. Direct broadcast satellite dishes use an LNBF, which integrates the feedhorn with the LNB.


Why signal loss happens to dth during rain?

the transponders present in satellites which transmit signals towards earth uses frequencies within Ku band. Ku band is a special set of frequencies ranging between 10-15 GHz. The main advantage of using this band is that the antena size can be very small and the recieving equipments are relatively cheaper. These signals are of small wavelength due to which they are more prone to atenuation due to water droplets in the atmosphere. In fact there wont be any solution for this problem too..:(


What are up link and down link frequencyof gps?

GPS satellites transmit on two primary frequencies; band L1 is 1.57542 GHz, and band L2 is 1.22760 GHz. The uplink frequency is restricted and/or classified information.


What is the new IBOC broadcast system?

The IBOC Broadcast System stands for the In-band on-channel system. In-band on-channel incorporates both digital and analog radio signals which transmit together on the same frequency.


Difference bitween active and passive satellite?

In passive satellite system the ground transmitting system power at the reflector. The receiving ground system received a function of the power that has been intercepted by the reflector. In active satellite received the function of the energy band toward it by the ground transmitter system and the received power is active amplitude by active electronic means.


What is a broad band on computers?

Broadband is tehnology that uses one physical media to transmit many types of signals such as internet, video, telecomunications etc... check this link http://en.wikipedia.org/wiki/Broadband


Advantages and disadvantages of WDM?

One of the advantages of WDM is fewer wires or channels are needed to transmit and receive data. One disadvantage is that complex transmitters and receivers must be wide-band.


Difference between inband and out of band signaling?

In in- bandsignalling , the control and management signals travles along with the data signals where as in out of band signalling the data and control signals travels in different channels


Who is the lead singer of the band satellites and sirens?

The lead singer in the band Satellites & Sirens is Geoff Hunker. I met him at a fuge camp(church camp), in Tennessee. He is really nice, and really cute too!!


When considering a portable shortwave radio if it only has one band width which is better wide or narrow?

You will want a wide band, if you are limited to only one. This allows for a greater breadth of signals you can receive on your shortwave radio, particularly since it will be a smaller portable unit.