These are frequencies used for satellite communications.
Usually in the Gigahertz bands.
Uplink is on a differenct channel to downlink, to avoid interferece.
The Uplink, is the signal sent to the satellite, via a dish antenna, which focuses the signal in the direction of the satellite.
On board the satellite, this signal is changed and re-transmitted, on a different frequency (Downlink), and beamed back to earth.
This way huge distances can be covered on earth, despite the curvature and with minimal power.
Graphically you'd draw a stylised satellite (in orbit) and satellite dish (on the ground), with a dashed line between the two. If the dish is both transmitter and receiver, use arrowheads in both directions. If it is a receiver only, arrowheads should point from the satellite to the dish.
No such thing as a galvanized iron roof. They are galvanized steel. The sound is distinct and as I cannot post audio it is impossible to describe the sound. But if you will click the link you can hear it.
Fiber optics is quicker and has higher bandwidth but for long distances requires more infrastructure (but it is on the planet so is more easily repaired).Satellite communications is slower with lower bandwidth and noticeable delays, the long range capability is greater but parts of the infrastructure (the satellites) are very expensive to replace and repair.
That is called a chained selection. See related link for an example.
It is microwaves that are used for radar. They are high frequency, short wavelength electromagnetic waves, and a number of different frequency ranges of these microwaves are used depending on the application. A link is provided to the Wikipedia article on radar and the different bands or ranges of frequencies that are used and their applications.
In satellite communication, up link refers to the signal traveling up to the satellite while down link refers to the signal coming from the satellite down to earth.
a. avoid interference from terrestrial microwave links
This is done to avoid crosstalk. If, for example the up and down -links were on the same frequency, it would work much like a walkie-talkie, meaning only one person could send, and one receive, at any given point in time. By giving each direction its own carrier wave, it allows both deviced to send and receive simultaneously, which greatly speeds communication.
In up-link the portion of a communications link used for the transmission of signals from an earth terminal to a satellite platform.. a down link is the link from a satellite to a ground station..
== == http://en.wikipedia.org/wiki/GPS#Navigation_signals That might help
The uplink frequency is higher than the downlink frequency in satellite communication because higher frequencies can carry more information and are less affected by interference and noise. This setup allows for efficient communication between ground stations and satellites, ensuring a reliable transmission of data.
A crosslink is when satellites communicate directly with eachother, instead of communicating with a ground station which, in turn, communicates with other satellites. Frequencies that are quickly attenutated in the atmosphere are commonly used, making the link undetectable and unjamable from the ground.
A crosslink is when satellites communicate directly with eachother, instead of communicating with a ground station which, in turn, communicates with other satellites. Frequencies that are quickly attenutated in the atmosphere are commonly used, making the link undetectable and unjamable from the ground.
The downlink frequency to Earth, in the context of communication satellites or spacecraft, refers to the frequency at which data is transmitted from the satellite to Earth. The specific frequency used can vary depending on the satellite system and the communication protocol being employed. Generally, downlink frequencies for satellite communication are in the microwave frequency range, typically between 1 to 50 GHz. The choice of downlink frequency is influenced by factors such as transmission range, atmospheric absorption, and regulatory requirements.
Click on the link below for more information.looking for frequencies for venange county pa
Many ocean going vessels operate on HF bands and use satellite radios, none of which are accessible by most scanners. There are standard VHF frequencies/channels used by many boaters and ships though, and you can follow the link below for a complete list of them: http://www.navcen.uscg.gov/marcomms/vhf.htm
Satellite A11 Click the link below for an article about it.