The TRX-1520 is an analog receiver and there is not much left to watch that is still analog.
You could use it to move a BUD, or to change polarity on an LNBF with a servo-controlled feed, but that's about it. If you don't have a BUD it's basically useless to you.
Also, those old analog receivers typically sell for slightly above the price of shipping on eScamBay, I bought a TRX-1820 a few months ago for $1.12 + $15 shipping.