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en:hf_tx_subsys [2017/12/03 15:42]
writer
en:hf_tx_subsys [2019/09/16 15:43]
golikov
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 Virtual [[power_subsys|consumption]] - 6100 mA Virtual [[power_subsys|consumption]] - 6100 mA
  
-{{ ru:hf-transmitter.jpg?direct&​200|}} +{{ :ru:вч_канал.png?400ВЧ канал}}
-The radio communication system is one of the key service of on-board systems. However, like many engineering systems it does not have an ideal solution. Designing each device you need to search for a balance between the data transfer rate and the [[power_subsys|power consumption]] of the on-board radio equipment as well as between the width of the antenna directional pattern and its efficiency. Each new satellite project requires special approaches to solve the problem of data exchange between the board and the Earth.+
  
-The standard solution ​is to install low-speed communications equipment on the satellite ​to [[uhf_tx_subsystransmit telemetry]] via the "​board-to-Earth"​ line and control commands to the satellite via the "​Earth-to-board" line. As a rulein this case the satellite is equipped with either an omnidirectional antenna or a system ​of spot beam antennasSuch a system allows communication with the spacecraft irrespective ​of its orientation and rotation speed; it consumes low power but also provides small data transfer speed (about 9600 bps).+The radio communication system ​is one of the key services of the on-board systems. However, like many engineering systems it does not have an ideal solution. When designing each device, you need to search for a balance between the data transfer rate and the [[power_subsys|power consumption]] of the on-board ​radio equipmentas well as between ​the width of the antenna directional pattern and its efficiencyEach new satellite project requires special approaches to solve the problem ​of data exchange between the board and the Earth.
  
-Another option ​is to use a high-frequency high-speed ​transmitter with a spot beam antenna ​to transmit payload information to the  ​[[sim_earth|Earth]] on the "​board-to-Earth"​ line. The data transfer speeds in this way are tens and hundreds of megabits per second. Howeversuch equipment consumes more power and requires precise orientation of the on-board antenna (and hence of the entire ​satellite) relative to the Earth in order to get the directivity diagram of the on-board antenna ​to the ground receiving station.+The standard solution ​is to install low-speed ​communications equipment on the satellite ​to [[uhf_tx_subsystransmit telemetry]] via the "​board-to-Earth"​ line, as well as control commands to the satellite ​via the "Earth-to-board" line. As a rule, in this case the satellite is equipped with either an omnidirectional ​antenna ​or a system of spot beam antennas. Such a system allows for communication with the spacecraft irrespective of its orientation and rotation speed; it consumes low power, but also provides a low data transfer speed (about 9600 bps).
  
-High-frequency ​(HF) high-speed transmitter ​is implemented as a separate module in the construction set including a simple LED that flashes ​with a specified frequency and a certain sequence. At the moment when the light from this "​transmitter"​ gets on the high-frequency receiver ​to [[sim_earth|the Earth]], it is considered that the communication channel is opened and it is possible ​to transmit the data of photos from the satellite to the ground (in reality ​via WiFi network)+Another option is to use a high-frequencyhigh-speed transmitter with a spot beam antenna ​to transmit payload information to the  ​[[sim_earth|Earth]] ​via the "​board-to-Earth"​ line. The data transfer speeds using this option are tens and hundreds of megabits per second. However, such equipment consumes more power and requires precise orientation ​of the on-board antenna (and hence, the entire ​satellite) relative ​to the Earth in order to get the directional pattern of the on-board antenna to the ground receiving station.
  
-The high-frequency transmitter is one of the main consumers of electricity on board the satellite. It is highly discouraged to keep it permanently ​on if there is no special need for it: too much load on the power supply system will lead to a quick accumulator slump and emergency deactivation of the "board".+The high-frequency ​(HF), high-speed transmitter is implemented as a separate module in the construction set, and includes a simple LED that flashes with a specified frequency and a certain sequence. At the moment when the light from this "​transmitter"​ is received by the high-frequency receiver on [[sim_earth|the Earth]], it is considered that the communication channel is open and it is then possible to transmit the data (photos) from the satellite to the ground (in reality - via WiFi network).  
 + 
 +The HF transmitter is one of the main consumers of electricity on board the satellite. It is highly discouraged to keep it on permanently ​if there is no special need for it. Too much load on the power supply system will lead to a quick battery drainage ​and an emergency deactivation of the "​board."
en/hf_tx_subsys.txt · Last modified: 2019/09/16 15:43 by golikov