output stream limit

Hello

im having a small problem with streaming more than 7 channels at once ( in 770Mhz frequency there are 10 channels )

when i try to stream one more channel i get an error:

is this a software problem or an hardware limitation ?

Thanks

hi

screenshots:

1 - 2249-screenshot-7-png

2 - 2247-screenshot-4-png

3 - 2248-screenshot-5-png