Switch 21-x instalation help!!!!

[COMODO]

I'm using 3 seperate dishes aimed @ 110,119 and @ 148. The problem I have is that when I put 110 and 119 at switch 21 and 148 at switch 21-x
then do the CHECK SWITCH ,my reciever is detecting only 110 and 148 and after I
put the cable on switch 21 the other way then I get only 119 and 148.
Is this the switch problem or the operator!!!!
Guys thanks in advance!!!!

[jpw]

You need a sw41 switch. It will allow you to add up to 4 sats.I could never get the sw21x to work properly. I'm running 119, 110 and 121 on a sw41.
Jeff.