[Notimetolooz]

What I was driving at was that 15 years or so ago LED lights, etc. were not as common as now.
The frame rate is 30 per second, i.e., 30 Hz. With 24 lines the line rate is 720Hz.
The highest video frequency would be difficult to know, however the image is approximately square so if it could resolve along each line at the resolution of the vertical scan (24 "dots") that would give a upper video frequency of 17,280Hz. That would be a video bandwidth of 30 Hz to 17KHz, all within the audio range. That range includes the 120Hz flicker rate.
Anyway it was just a suggestion for the source of the problem.

The camera kit instructions don't go into details about the receiver as far as I saw.

EDIT: As my head hit the pillow last night I realized I made a calculation mistake. The upper video frequency to give a 24 "dot" resolution on the lines is half what I wrote, 8,640Hz not 17,280. It doesn't matter for the problem here however.