I have a Dish with LNB SL3S4NR2-01, if I purchase the HR24-500 HD DVR, will that be compatible? I notice there is only 1 coax line running out of the dish but the receiver has 2. Do I need to purchase anything additional? Also, if it works, what will the capability be of recording vs watching a different channel, etc? Thank you in advance for for all your help!!