I believe the OP is not asking just,
'Are nodes and hubs interchangable'.
I believe he is also wanting to understand how the node and hub differently affect/change the input signal from the lnb to the signal coming out of the node or hub.
Thus explaining the technical difference between the signal processing of the Legacy and Hybrid.
What is Legacy doing to the signal to allow 3 tuners?
and
What is Hybrid doing differently to the signal to allow 16 tuners?
How are the different non-compatible technologies electro-mechanically 'working' the same satelite signal?
As opposed to meerly stating which components are compatible to which system.
He's asking for electro-mechanical-radio engineering explaination.
just devil advocating here.
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