carryout, dish 211K problem not fixed

Thanks for all the help. I took the 311 receiver out of the garage and hooked it up to my Carryout . I connected it directly to main 25" RCA crt tv and the picture was perfect. I then decided to hook it through the switcher and again the picture was perfect on both the frt and rear tvs. I then unhooked the cable from the Dish to the back of the receiver and plugged it into the cable in port of the mh and then connected a coax between the cable in port of the switchbox and the Dish 311 receiver and all the pictures on the tvs were perfect. I have done the same trial with 2 different 211k receivers and both produced snowy (noisy) pictures even when bypassing the cable in port and the switchbox. So why don't I just use a 311 receiver? one reason is you cant add a hard drive and record, another reason is I would like to be able to used my hi def tv outside when camping and most importantly is I have spent a lot of time on this and I want to know why the 211k wont work,