Hi Dave:
The small size of the Ku-band TV dish and that it's surface is covered with a "flat" type paint means there's little or
no thermal heating of the receiver or feed.
There were cases with the early C-band TVRO systems where they did melt the
receiver.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 9 Oct 2014 22:17, "Andrew Rodland" <[email protected]> wrote:
You pick up satellite TV with a parabolic dish that points at one spot
in the sky where the geostationary satellite lives. A sun outage
happens when the sun wanders into the focus and overloads the receiver
with noise that drowns out the satellite signal (at least, it raises
the noise floor enough that you can't receive the high bitrates needed
for a TV picture).
You pick up GPS with a whole-sky antenna that receives signals from
the constantly-moving swarm of GPS satellites. It undoubtedly receives
some noise from the sun, but the only factor in how much of that you
get is the sun's elevation above the horizon. It's not really relevant
whether the sun is "aligned with a satellite" or not. Even if it was,
the satellite would be somewhere else a minute later. :)
Andrew
Also the much higher gain of the satellite antenna means if the Sun is in
its beamwidth, a much larger increase in noise will occur.
I would actually be concerned about the Sun heating (melting ??) the
receiver, like I expect we have all done with a magnifying glass. The
capture area of a dish is a lot more than any "normal" magnifying glass.
Dave
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