Static and HIDs
01-10-2009, 03:13 PM
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Static and HIDs
A few months back i bought some plug and play hids from the Movement HID guy. There good and work just fine. Ive got an old jvc cd deck in my car and its worked fine forever. I used to get static when my antenna plug would get loose and unplug itself, so i thought that was why i had been experiencing static. A few weeks ago i realized that when i turn my HID's off my static disappears. Im guessing that there is some interference or something happening with the hids, but i honestly dont know what to do. has anyone else had this problem? if so how did you fix it?
summary: i only get static on my radio when i have my HID's on.Why? is there a way to fix it?
summary: i only get static on my radio when i have my HID's on.Why? is there a way to fix it?
01-11-2009, 07:19 AM
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01-11-2009, 11:11 AM
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Re: Static and HIDs
That's probably not the problem. The problem is that the ballast radiates electrical noise like an antenna. It's got a (switchmode) power supply in it that takes the battery voltage, switches it at some high frequency with FETs into a square wave, and steps the voltage up through a transformer. That's how the high voltage for the HIDs is created. The problem is that the transformer acts like an antenna, the FETs give off wideband EMF, and the whole process introduces switching noise on the power and ground wires.
A metal case for the ballasts can't stop EMF over the whole frequency range that is produced, so some can get coupled into the radio as either EMF or ground noise.
I can't say what exactly is causing the noise, but I'm going to assume that part of it is a poor quality radio receiver, part of it is probably a poor ground to the radio, and part of it is a poor quality power supply section in the radio.
This is really something that has to be dealt with through experimentation. Try changing where the ground on the radio is, make it as short as possible, and you could try isolating the ballasts with an insulating material (like double sided tape). It's a hard thing to troubleshoot without knowing what type of noise is actually causing the problem.
A metal case for the ballasts can't stop EMF over the whole frequency range that is produced, so some can get coupled into the radio as either EMF or ground noise.
I can't say what exactly is causing the noise, but I'm going to assume that part of it is a poor quality radio receiver, part of it is probably a poor ground to the radio, and part of it is a poor quality power supply section in the radio.
This is really something that has to be dealt with through experimentation. Try changing where the ground on the radio is, make it as short as possible, and you could try isolating the ballasts with an insulating material (like double sided tape). It's a hard thing to troubleshoot without knowing what type of noise is actually causing the problem.
01-13-2009, 05:27 AM
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Re: Static and HIDs
That's probably not the problem. The problem is that the ballast radiates electrical noise like an antenna. It's got a (switchmode) power supply in it that takes the battery voltage, switches it at some high frequency with FETs into a square wave, and steps the voltage up through a transformer. That's how the high voltage for the HIDs is created. The problem is that the transformer acts like an antenna, the FETs give off wideband EMF, and the whole process introduces switching noise on the power and ground wires.
A metal case for the ballasts can't stop EMF over the whole frequency range that is produced, so some can get coupled into the radio as either EMF or ground noise.
I can't say what exactly is causing the noise, but I'm going to assume that part of it is a poor quality radio receiver, part of it is probably a poor ground to the radio, and part of it is a poor quality power supply section in the radio.
This is really something that has to be dealt with through experimentation. Try changing where the ground on the radio is, make it as short as possible, and you could try isolating the ballasts with an insulating material (like double sided tape). It's a hard thing to troubleshoot without knowing what type of noise is actually causing the problem.
A metal case for the ballasts can't stop EMF over the whole frequency range that is produced, so some can get coupled into the radio as either EMF or ground noise.
I can't say what exactly is causing the noise, but I'm going to assume that part of it is a poor quality radio receiver, part of it is probably a poor ground to the radio, and part of it is a poor quality power supply section in the radio.
This is really something that has to be dealt with through experimentation. Try changing where the ground on the radio is, make it as short as possible, and you could try isolating the ballasts with an insulating material (like double sided tape). It's a hard thing to troubleshoot without knowing what type of noise is actually causing the problem.
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