Installing a video distribution amplifier inside a PRO battery module to prevent signal feedback and ghosting from simultaneous recorder inputs and outputs

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2007Video Assist and Video Accessories forum

19 years old. Gear and prices may have changed since.

A video distribution amplifier can be mounted inside the battery module between the recorder and transmitter connector to isolate recorder outputs from inputs, eliminating ghosting caused by signal feedback.
The VAC model 11-011-504 fits in the available space inside the battery module and can be attached with velcro.
Replacing the recorder/playback switch with a DPDT version enables proper switching between recording and playback modes when using an internal distribution amplifier.
Powering the recorder from the camera battery instead of the video battery reduces electrical noise in the system, as simultaneous operation of the XCS electronic level and PDR-100 on the same battery causes interference.
A video transmitter mounted on the bottom of the sled works reliably with this modification.
The distribution amplifier approach is more elegant than using an external distribution amplifier with a separate switch.

The modification was tested with specific equipment: TB-6 system, PDR100-H recorder, CIT antenna with Sony tuner, and XCS electronic level.
Long-term reliability of the PDR recorder was still being evaluated at the time of posting.
The specific switch part requires ordering from a supplier rather than using readily available alternatives due to thread pitch requirements.
Noise reduction strategy may vary depending on power source configuration and specific equipment combinations.