Ok,but what mystifies me is that both hoppers are getting the same signal,off of the same coax.Which ever hopper is turned on first,"grabs"" the signal,and will not let it pass thru the splitter.Well, it really does not prevent the signal from passing through,but the 2nd Hopper will not get any satellite signals.
The signal will pass through the splitter if #2 hopper is turned on first,instead of number 1 hopper.That is why I thought there might be some addressing going on in the duo node.
The signal level on the splitter remains the same on both ports no matter which one is switched on.Swapping the outputs on the splitter makes no difference.The input from the duo node is on the in/out/dc port of the splitter,all ports pass dc for powering up the node,etc.
I used to install the old C Band systems, and I am familiar with the older systems of polarizer servo for even/odd channels,and the original VSO requiring an LNA (Before LNB's were invented.)The down converter was on the mast,and a channel was selected by a voltage sent from the receiver.The down converter was a Voltage Switched Oscillator.
Then came LNB's which made 12 channels available at the receiver.The LNB did the down converting from 3.2 Ghz to 950-1450 Ghz.(which contained all 12 channels.), A band spread of 500 Mhz.,which I see they still maintain.But everything else has changed...a lot.
Much better picture quality,much smaller dish,simpler installation,and simpler operator operation.
I just like to know the nuts and bolts of a system to satisfy my curiosity.I know a schematic is proprietary,so I know that is out of the question,however a detailed functional block diagram would be helpful.
Thanks
