Anatoly Mashanov wrote:1. Be sure that you power your camera and your monitor from separate batteries. Never economize on batteries.
This even creates power issues..
There will be potencial voltage differences between power sources.
Anatoly Mashanov wrote:2. As I understand, SDI is scrambled. So a small capacitor in serial and some TVI suppressor, for instance, Philips PESD in parallel, would suffice for protection of SDI. I wonder why it was not done before.
Every SDI input and output has a small capacitor directly behind the connector. A PESD will influence the SDI signal in the wrong way. Impendance of SDI comes very critical.
Anatoly Mashanov wrote:3. I have repaired lots of stuff killed with static. In half of cases there were Philips PESD which were burned and shorted the link. Maybe it's already a burned protector that shorts your output?
There is no PESD in there.. Small capacitor and some resistors to do 75 Ohm coupling. After that it goes directly into the driver or receiver for monitors and mixers..
SDI is +/- 400mv signal. So max 800/900mv peak..
If you have a power potential difference that is greater then 10V or so the capacitor will not protect you anymore.. Grounding people, grounding is everything!!