@woland I do SDI and it is my preference, but I use a lot of CAT as well, but the cat based extension systems differ a lot, there is some cheap stuff and then real HDBaseT. The cheap stuff is not really worth using. The only problem with HDBaseT is that is re-encodes the video and gets rid of data. You will see that almost all HDBaseT is fixed at 4:2:0 colour compression. SDI conversions will not do any comprression, they just re-wrap the data, and if you send 422 or 444, that is what comes out at the other end. Cable is a bit more picky, although HDBaseT at 75m is also pretty picky and good tactical cat6 sftp (the sheilded kind) that has a good rubberized cover and does not kink will cost the same or more than the equivalent 3GSDI cable. The biggest advantage of the HDBaseT systems is the good ones (eg lightware) can be powered from either end and they can also carry a network connection so you can control the projector as well. Some projectors (late model panasonic) also have a direct HDBaseT input (but these models often have HDSDI as well), which also carries the network signal for control which is pretty cool, there are even HDBaseT matrixes. As a rule pretty although you can get functioning systems, HDMI or DVI should not go over 5m passively, active stuff is mostly consumer orientated and although some of it is good, with cat or SDI you can put a new tip on a cable in less than 5 mins, this is important for pros, and makes it worth investing in good cable.
