2006Video Assist and Video Accessories forum
Preventing unwanted video signal feedback from a camcorder with shared input/output connector on a Steadicam rig
20 years old. Gear and prices may have changed since.
What the thread found
- A camcorder with a shared input/output connector defaults to transmit mode on startup, causing the camcorder signal to interfere with the camera signal on the video line until manually switched to record mode
- Using a diode to block reverse signal flow introduces problems such as preventing playback monitoring on the Steadicam monitor
- A dedicated switch cutting the recorder signal from the main video line offers better control than attempting passive diode blocking
- The ideal solution would be a recorder that remembers its last operating mode and boots into input mode by default
- Similar signal interference problems occur with recorders that have separate input and output connectors but leave the output continuously active
Depends on
- The proposed zener diode solution was tested as an experimental low-cost approach but long-term results were not confirmed in the thread
- The specific camcorder model was not identified in the discussion
- No definitive solution was reached that worked reliably for operators unfamiliar with manual mode switching
- The problem also affects other recorder models like the Supacam, suggesting it is a broader design issue