i was helping a friend that bought the gm1518 to take on camping trips. he is planning on using his 3900 model dishnetwork receiver that he subs with at home. everything was working fine when i started, i unhooked his receiver that was hooked up to a dish 500 with a leagsy dual lnb with a sw21 switch, i unhooked the lnb wire and done the check switch and cleared the receiver out for the carryout dish. i got the carryout dish working fine. when i tryed to hook his receiver back to his dish 500 it went crazy. when doing a check switch it will sometimes find sat 119 odd and even and 110 only odd. wont play all channels. did the gm1518 dish GEEK up the prosser in this receiver? any help would be greatly appericated.
otis

