On Sun, 22 Sep 2013 00:47:41 GMT, Windmill wrote:

There could be some form of signal strength feedback to "peak the
alignment" when about in the right place but that couldn't be used
to
keep the dish aligned as it doesn't provide information about
which way
to move the dish.

Mmmm - couldn't you do that by moving one way a small amount until the
signal falls a little, then the other way until it rises then falls to
the same amount as before, and then split the difference?

How do you know that the signal fall, or rise, is due to the movement
and not some other external factor, heavy rain, dish icing, sun
outage, bird perched on LNB...

Pointing to a TV satellite has to be fairly precise, but pointing to an
internet satellite has to be super-precise - a 3 watt transmitted
signal has to reach up 22,400 miles to the satellite.

3 W ERP or 3 W of RF into a 20 dB gain dish? (350+ W ERP...)

--
Cheers
Dave.