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Old 10-01-2022, 06:53 PM
rld-tv01's Avatar
rld-tv01 rld-tv01 is offline
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jhalphen,

Both Dave A and I built Camera / Receiver kits which worked 15 years ago. Mine sat in Storage for 8 years after I moved from Virginia to California. Dave also hasn't used his. I pulled my kit out of storage since Dave was having problems with his. It now seems both his and mine aren't functioning properly. I don't have access to the light I used 15 years ago which was a generic Home Depot aluminum shield clamp work light. I have two 85 watt effective 700 watt photographic lights in storage. I have to go fetch one or both in the future for another test of mine.
What Peter's instructions need is a trouble shooting section. Both Dave's and my kits are fully built and worked fine 15 years ago. I was probably lucky at the time. Two weeks ago I made the mistake taking off the camera disk and putting it back on with the rubber gromlet washer holding the disk too close to the hub behind it. Reading Peter's instructions again I saw it states the disk must float freely on the spindle. Peters instructions shows everything you need to build the camera / receiver but very little on how to trouble shoot (a little bit on page 9 only).

Last edited by rld-tv01; 10-01-2022 at 07:12 PM.
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Old 10-01-2022, 11:06 PM
Notimetolooz's Avatar
Notimetolooz Notimetolooz is offline
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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.

Last edited by Notimetolooz; 10-02-2022 at 10:58 AM.
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