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Why there is an difference in uplink and downlink frequencies in satellites?
Wiki User
∙ 12y ago
It is much easier to build a satellite transponder using different frequencies for the two directions (frequency division duplex, FDD). A single frequency (time division duplex, TDD) satellite link is possible, but then all earth terminal must be carefully synchronized. The satellite transponder and the earth terminals would be more expensive, the whole network would be more complex and less reliable. There is also a historical reason. Frequency bands were allocated decades ago and changing them would be very difficult. FDD and TDD terminals cannot coexist in the same geographical area.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoBecause most satellite communication is in Duplex mode (ie transmitting and receiving at the same time) If the satellite only had one uplink & downlink frequency, it would have to send information in 'blocks' and wait for a reply to each block before sending the next one. Duplex transmissions send on one frequency, and receive on another - to enable full two-way communication to take place.
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What is uplink and downlink?
Uplink and downlink are frequencies Communication from earth station to satellite in uplink and communication from satellite to earth station is downlink Always uplink freq.>downlink freq.
How satellite communication is different from communication relay?
For communication satellites the range is much higher than that of communication relay. Communication Satellite can cover up to several thousands of kilometers. For communication relay, the uplink and the downlink frequency is the same. But for communication satellites the uplink and the downlink frequencies are different in order to avoid interference.
Why must a satellite have distinct uplink and downlink frequencies?
To avoid interference
What is duplex spacing?
Duplex distance/spacing is the distance between the uplink and downlink frequencies
What is gsm uplink?
Hi, For every GSM band there are Uplink and downlink frequencies. Example: GSM 900 TX: 880 MHz to 915 MHz is an uplink frequency range GSM 900 RX: 925 MHz to 960 MHz is a downlink frequency range Aloha, Maverick
Schematic diagram of uplink and downlink?
uplink frequency-1710-1785MHz downlink frequency-1805-1880
What is upink frequecy in GSM?
It varies - according to which system is in use. The related link to Wikipedia lists the uplink & downlink frequencies.
What is the Uplink and downlink frequency for GSM900?
Uplink --> 890 MHz - 915 MHz Downlink --> 935 MHz - 960 MHz
What is an uplink an downlink in mobile coommunication?
Uplink is from MS to BS Downlink is from BS to MS P.S: BS=Base Station, MS=Mobile Station e.g cell phone
What is uplink frequency?
Uplink frequency is a frequency that goes from the ground to the satellite. Downlink frequency goes from the satellite to the ground.
What is the radio frequency numbers for the ISS station?
Worldwide downlink for voice - 145.80Worldwide packet uplink/downlink - 145.825Region 1 voice uplink - 145.20Region 2 and 3 voice uplink - 144.49Worldwide uplink for cross band voice repeater - 437.80Worldwide SSTV downlink - 145.800For more information, visit the NASA ISS Amateur Radio page at http://spaceflight.nasa.gov/station/reference/radio/
Why downlink is greter than uplink?
The downlink is greater than the uplink on most internet connects due to overall demand for bandwidth. Downloading takes up a majority of internet usage and connections are optimized for it.
