KVH Industries TracVision 6 - Manual (Page 32)

Programming DSS Plus IRDs
If you are using multiple DSS Plus IRDs and intend to shift from
one satellite to another, only one of the IRDs can be configured as
a two-satellite receiver. All other IRDs must be configured as one-
satellite receivers. The two-satellite IRD will determine which
satellite the antenna is tracking while the other receivers can
watch any channels available via that satellite. Refer to your IRD
owner’s manual for complete details on this process.
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TracVision 6 Technical Manual
If you use an active multiswitch to
connect three or more IRDs, the
multiswitch will interfere with the
22 KHz tone sent by DIRECTV
DSS Plus
™ IRDs to the antenna. As
a result, the antenna will not
receive the signal to change
satellites when you change
channels using your DIRECTV DSS
Plus remote.