ku-
The XM Radio satellites use S-band frequencies from 2,332.50 through 2,345.00 MHz.
GPS Satellites use two frequencies 1.57542 GHz and 1.2276 GHz. AIS operates in the Marine VHF band using channels 87B, 161.975 MHz and channel 88B, 162.025 MHz
The moderator band, also known as the septomarginal trabecula, is located in the right ventricle of the heart. It extends from the interventricular septum to the base of the anterior papillary muscle. Its main function is to conduct electrical signals in the heart to coordinate contractions.
Bluetooth is a wireless interface standard for exchanging data over short distances (using UHF radio waves in the ISM band from 2.4 GHz to 2.485 GHz) from fixed and mobile devices, and building personal area networks (PANs). It can transmit many kinds of data: digitized audio, text, mouse pointer movements, etc.
Satellite orbital spacing refers to the distance between different satellites in orbit around the Earth. This spacing is carefully planned to prevent collisions and to optimize coverage, communication, and other functions of the satellite network. Satellite operators coordinate with each other and regulatory bodies to ensure safe and efficient use of orbital space.
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
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.
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.
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..:(
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.
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.
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.
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
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.
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
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!!
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.