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HelicopterAerial Photography and Video › Noise in video d/l - solutions?
05-05-2005 05:10 AM  12 years agoPost 1
iflybyu77

rrKey Veteran

Fort Wayne, IN

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I've got a bwav downlink system on my gasser that I've got a pretty serious issue with noise. The culprit seems to be the engine - as it's clear until the mount is near the heli. I'm using the stock cable to connect the camera to the transmitter, and it's about 1' or 1 1/2' too long (coiled up the remainder right near the transmitter) and it does appear to have a ferrite choke on it for noise suppression. It has lines that appear in the video horizontally, and they SEEM to vary with engine rpm's.

I'm using my Canon Powershot Pro 1 with this setup, and the video output is a 1/8" stereo style jack - should I perhaps just make my own shorter cable using shielded wire? Or maybe someone elses experience would save me some time. I've considered making the project box that holds my electronics/receiver/video transmitter connect to the mount via cat 5 cable - sharing a common for the servos ground and using one of the twisted pairs for video .. but after seeing the level of noise I'm dealing with, I'm wondering if that's a good idea. Thoughts are appreciated!

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05-05-2005 08:18 AM  12 years agoPost 2
CKY

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Sunshine Coast, BC, Canada

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I usually cut off the audio portion of the cord if it has two separated leads when I shorten the cord. Audio is not of much value. Solder a Deans plug to the ends, or a new RCA plug if needed. A foot and a half of extra length cannot be good.

Chris

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05-05-2005 05:03 PM  12 years agoPost 3
MPA

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Australia

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AV Tx doesnt like any vibration, it shows up as interference to the image.

Make sure it is well isolated, or isolate it some more by hanging it loose on a rubber band, if that cures it then thats the problem and can can isolate it accordingly.

.

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05-05-2005 05:31 PM  12 years agoPost 4
iflybyu77

rrKey Veteran

Fort Wayne, IN

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MPA..

Never thought of the vibration thing! Wonder how I can isolate it without having to modify my antenna hole... hmmm.. Good thought. I'm more likely to try that first since it's a "easier" fix..

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HelicopterAerial Photography and Video › Noise in video d/l - solutions?
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