You can't hook up the 622 where the 301 was. You will need 2 cables from the dish to the 622. If you had a 301 and a 508 you more than likely had a Dish Pro Twin LNB on your dish. That won't work with a separator you need a Dish Pro Plus Twin LNB to use the separator. You also need a dish pointed at 61.5 or 129 to get the HD channels you will have to subscribe to. In your post about adding another dish 500 didn't you post that you had ordered a 222 because you didn't use a DVR.?