Satellite Frequency Bands Uplink And Downlink

800 2150 mhz.

Satellite frequency bands uplink and downlink.

Satellite vsat communication is split up in to four radio frequency rf bands that commercial communication and military satellites operate within. So uplink frequency is different from downlink frequency. Frequency band separation allows the same antenna to be used for both receiving and transmitting simplifying the satellite hardware. 70 150 mhz.

Uplinks on both 435 mhz and 1 2 ghz linking to 145 mhz and 10 ghz downlinks would be called mode ulvx but shut would still mean system switched off. Satellite is in a low inclination low earth orbit and not visible north of about 30 degrees north or south of 30. The most popular frequency bands available on satellite are l band s band c band x band ku band k band and ka bands. Now as would have thought separate frequency bands are always allocated for uplink and downlink signals often separated by a gap maybe for future allocation since the span of guard bands.

For real time updates about which mode the satellite is in see the amsat live oscar satellite status page. Here are the band designators the first letter stands for the uplink the second letter for the downlink. These different frequency bands have separate uplink tx and downlink rx frequencies require different rf components lnb and buc and are suited to different applications. Io 86 lapan a2 uplink fm 88 5 hz ctcss downlink fm.

The rf unit called upconverter is used to convert baseband frequency to rf frequency for transmissions in the uplink side. In europe ku band downlink is used from 10 7 ghz to 12 75 ghz for direct broadcast satellite services such as astra. Mode b would be called mode uv. Ka band 26 40 ghz communications satellites uplink in either the 27 5 ghz and 31 ghz bands and high resolution close range targeting radars on military aircraft.

System activation was first observed at 01 02 utc on september 2. Satellite frequencies ghz band. Io 86 lapan a2 145 880 mhz. Initial operation of the new radio system is in fm cross band repeater mode using an uplink frequency of 145 990 mhz with an access tone ctcss of 67 hz and a downlink frequency of 437 800 mhz.

In gsm frequency range from 935 mhz to 960 mhz is used as downlink frequency range.