I am getting ready to purchase an ATEM Television Studio and a few HDMI to SDI converters.
After reading other posts here on CC I understand that running HDMI to the ATEM TVS can be problematic at times,(which is why I'm converting to SDI). My question is, will I run into issues with HDMI cable lengths going from my cameras into the SDI converters? I want to have the HDMI to SDI adapter a short distance away from the cameras(~30 feet). Will I run into problems like the TVS? What is the longest HDMI cable you guys have run into these converters?
As a rule, we try to minimize the length of the HDMI cable because it's rather hard to nail down the quality of a particular cable with any objective criteria. Generally speaking, we locate the converter with the HDMI source and use a short cable, typically several feet.
Coaxial cable for SDI can cover far greater distances, and the performance is quite predictable. For example:
Belden 1694A is good for 1,339 feet at 270Mb/s (SD-SDI), 364 feet at 1.5Gb/s (HD-SDI), or 250 feet at 3Gb/s (1080p). Other smaller types like 1505A and 1855A have shorter distance limits. You can take a look at Belden's chart here.
Engineering Project Manager
Newport Television, Northeast