you can't. you have to have a switch or run a seperate line off the dish's lnbI have a 622 hooked up and I tried adding a 501 DVR by installing a Philips 2300 mhz two-way splitter ahead of the direct coax connection to the 622 receiver. Everything works great when only one of the two receivers is turned on. My problem is when the 501 is on, the 622 gets no signal. What else can I add to this splitter to boost the power enough so that both receivers can function at the same time?