I have a standard old setup, Dish 300 pointed at 119 with a dual LNB. I currently have 2 receivers hooked up I am looking to connect to a 3rd. The receivers are a 301, 3700, and a 3900. If I understand the 2 4 digits are older legacy receivers. Can I run one line from the dish and split it to the 3 receivers using a 34 switch. Thanks B