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FJR Motorcycle Forums
Technical & Mechanical Problems
Autocom/ipod/noise help needed
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<blockquote data-quote="Fred H." data-source="post: 160306" data-attributes="member: 2059"><p>If your buzz goes away when you run the Ipod on batteries, then the problem is MOST DEFINETLY a ground loop that has formed between the power adapter, Ipod, and Autocom.</p><p></p><p>You mentioned something about a small amplifier, but don't say how it is hooked up or powered. This amplifier could also be the source of the ground loop. You may need two ground loop isolators, one between the Ipod and amp, and one between the amp and Autocom.</p><p></p><p>Ground loops will many times form when the ground of the audio amps in the source are physically connected to the same ground plane as the bikes alternator. This happens when you plug in a cig lighter power adapter to the Ipod, as now the Ipod is connected to the bikes ground through the adapter. This causes a ground loop that forms from the Ipod, through the audio cable, and back to the Autocom.</p><p></p><p>Some (very few) power adapters are isolated to prevent this, but most aren't. The easy solution is to transformer isolate the audio signal between the source and the Autocom. This is what the ground loop isolator does. It is not a filter, but simply a transformer that prevents a DC current ground loop from forming, as the transformer will only pass the audio (AC) signal and blocks all DC.</p><p></p><p>If you have any questions, contact me off-line, I would be glad to help in any way I can and I am very familiar with Autocom equipment and the Super Pro Avi unit you have.</p></blockquote><p></p>
[QUOTE="Fred H., post: 160306, member: 2059"] If your buzz goes away when you run the Ipod on batteries, then the problem is MOST DEFINETLY a ground loop that has formed between the power adapter, Ipod, and Autocom. You mentioned something about a small amplifier, but don't say how it is hooked up or powered. This amplifier could also be the source of the ground loop. You may need two ground loop isolators, one between the Ipod and amp, and one between the amp and Autocom. Ground loops will many times form when the ground of the audio amps in the source are physically connected to the same ground plane as the bikes alternator. This happens when you plug in a cig lighter power adapter to the Ipod, as now the Ipod is connected to the bikes ground through the adapter. This causes a ground loop that forms from the Ipod, through the audio cable, and back to the Autocom. Some (very few) power adapters are isolated to prevent this, but most aren't. The easy solution is to transformer isolate the audio signal between the source and the Autocom. This is what the ground loop isolator does. It is not a filter, but simply a transformer that prevents a DC current ground loop from forming, as the transformer will only pass the audio (AC) signal and blocks all DC. If you have any questions, contact me off-line, I would be glad to help in any way I can and I am very familiar with Autocom equipment and the Super Pro Avi unit you have. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Autocom/ipod/noise help needed
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