QUOTE(neb @ Feb 4 2012, 01:03 AM)
one of the USA sat TV operator is using Ka band, benefit is wider bandwidth, smaller dish size
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Was googling about Ka band and I came across this:
http://www.gilatnetworks.com/data/uploads/.../gilat-vsat.pdf"Ka frequencies (~30GHz uplink & ~20GHz downlink) are almost
twice the frequency used by Ku (~14GHz uplink and ~12GHz
downlink). When high frequencies are transmitted and received in a
heavy rain fall area, a noticeable signal degradation occurs and is
proportional to the amount of rain fall (commonly known as known
as “rain fade”). The higher frequency the more a signal is susceptible
to rain fade. A typical Ku-band rain fade rate is ~1dB/sec while the
fade rate in Ka-band is significantly higher at around 3-5dB/sec.
Most new Ka-band satellites implement spot-beam technology
to reuse the frequency band across the desired coverage area. As
opposed to wide beams that cover large territories (e.g. all of Europe),
spot beams cover much smaller territories (1/50 – 1/100 of the large territory)."
With the description above, would this new generation of Ka band improve or at least maintain at the current Ku band performance involving rain fade giving that this new Ka band is using higher frequencies, but using spot-beam technology instead?