Video radio whine
Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=19601
Printed Date: July 26, 2025 at 7:24 PM
Topic: Video radio whine
Posted By: toyvet1
Subject: Video radio whine
Date Posted: October 02, 2003 at 8:59 PM
I just installed a Boss DVD, Pyramid monitors and a Fm modulator in my truck. I am getting a whining sound related to engine speed when I play a DVD. I don't seem to get the whine when I play a Cd through the dvd player. I stopped a Best Buy and picked up a "ground loop" that installed in the rca connections between the dvd unit and the Fm modulator. I still have the whine but not as bad. Any ideas what to check?
Replies:
Posted By: auex
Date Posted: October 02, 2003 at 9:59 PM
Make sure you have a clean ground. In my experience, if the fm mod is metal and it is touching any ground source it has had engine noise. Also make sure that there are no power wires running within 18 inches of the rca's that feed the fm modulator.
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Posted By: Nocturnal
Date Posted: October 03, 2003 at 4:19 AM
If you have the power hard wired, you may also want to check the source. I have found that some 12volt sources are not very clean when it comes to engine transients. If nothing else works, and your vehicle is large enough to hide an UPS, I have had luck with them also.
Posted By: asdf123
Date Posted: October 03, 2003 at 12:43 PM
Ive had the same issue with mine lately and I used a ground loop isolator that goes in line with the power/ground of the fm modulator. It seems to knock it down a lot. Much better than the RCA style ground loop isolator. I managed to find one at Radioshack, ran me about 15 bones I think. Also be sure like they said to isloate your power and rca's or you will get noise off of those as well. Another thing is if you can keep your ground sources to a minimum (use 1 ground source if possible) as well as keeping your ground short as possible will greatly reduce ground noise. Having several grounds (like a different ground for each monitor, dvd, etc) will give you lots of ground noise. Try not to use anything that has a coating on it such as a seat bolt or something like that. Usually they are galvanized or have some sort of dampening material on them to keep your vehicle nice and quiet :)
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Patrick
Apprentice Installer
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