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LNB Hacking? Answered

I recently came across a spare LNBF in my shop.  This is basically what you attach to a dish to receive your satellite TV.  I read up on them and I have a fair idea of how they work.  I was going to use this in some experiments and I found that you have to power it through the same coax that you receive the signals from.  I want to use this for a radio telescope.  I was wondering if anyone knew how to do this?