Quote:
Originally Posted by elgemcdlf
No my thinking is at the dish and as you stated receiver corrects. So you need to trap enough signal first before you can do anything. If that signal contains primarily clean data and less error correction then the bulk of your signal coming in would be actual signal. Thinking of signal like a container of water. The 8.5' dish catches 3 cups of water and the 1 meter dish catches 1. Let's pretend I only need to drink 3/4 a cup of water to survive. On the 8.5' dish I can afford to give up 2 1/4 cups of volumn for water purification but on the 1 meter I can only afford to give up 1/4 cup for purification.
In any case that was my line of thought. Right or wrong it was my line of thought.
|
However, using this unusual
analogy, I think the thing is, that regardless of whether your signal has high FEC or low FEC ratio, they are still sending the same cup of water. It's just that with the low FEC ratio, they are sending extra water in case you lose some of that water, so with low FEC, you have a better chance of getting your 3/4 cup needed to survive. Ie don't get stuck in a desert with a high FEC canteen.
The reason they use high FEC is to be able to squeeze that cup of water into a smaller canteen, ie with no need to include the extra water (ie signals intended for commercial dishes don't have to worry about so many errors).