BW Dual 4000 Installation Question

If you have two HX modems you need two transmit BUCs, each with its own antenna.  This is because a (Hughes) BUC is designed to work with a Hughes modem and transmit only one transmit carrier burst at any instant.

If you have two modems you have the possibility to transmit two bursts simultaneously and thus twice the total transmit traffic bit rate.  Having two modems, feeding BUCs on separate dishes, makes this possible. *

As far as spacing is concerned the dish in front must not block the beam from the one behind.  If the dishes are side by side and facing straight ahead, leave at least enough room so you can walk between them and work on one without interfering or blocking the beam from the other.   A wider spacing will give flexibility for the future e.g. such as working to different satellite, so close spacing should be avoided if you are mounting in non-moveable concrete.

I would suggest that you do not bind the two pairs of cables together, but route the pairs seperately, along with any heavy duty earth cables between the antenna bases and the indoor AC mains outlet point.  Avoid the possibility of LNB or BUC DC supply currents returning via the cables going to the other antenna.  A unknown open circuit in the sheath of one of the BUC cables could give you some weird symptoms and diagnostic problem.

Best regards, Eric.

* If anyone wonders how this might happen without the bursts colliding at the satellite, note that the HX hub has multiple return-link burst receivers and the hub will assign return link frequencies in real time so that  simultaneous bursts from remote sites are on different, but nearby, frequencies according to what hub receivers are available at that moment.