The cameras are designed to only broadcast
one camera at a time. If the receiver
receives more than one image it combines
them to a jumbled mess.
That is why the remotes first turn off the
camera that is on before turning on the new
one selected.
Also, the software that shows four screens
at once takes single frames in fast
succession by turning on one camera at a
time in rotation.
We have more than 10 cameras and they all
work fine as long as you only set one on at
a time.
If you have only 4 cameras make sure you
keep the IDs (1 through 4) or (5 through
, unless you bought the director remote
that goes beyond the 4 camera limit.