got my 921 current equip -dish 500 (119 & 110) dish 300-61.5,sw64, 2-6000 & 2-3800. will disconnect 1-6000 & 1-3800 to put in 921. my ? is my coax is old- marked "2200MHz" manual calls for 950-2150MHz or 2150 Mhz swept. can I use what i got, or need new ??