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c0rnelius
1060
Mar 17, 2018
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This is slightly off topic and definitely a neophyte question, but it has to do with wiring and electromagnetic intereference (EMI). I have a lamp on the same table as my stereo receiver. They are plugged into separate outlets and the wiring doesn't cross. When the lamp is on, I get static and buzzing when tuned to radio. When the lamp is off, it's clear. I'm wondering a) why? b) how can I fix this? c) does that mean there is interference on the phono input too? I just might be missing it playing mostly on low volume on speakers. Thanks!
Bob-B
3
Mar 17, 2018
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c0rneliusEvery electric/electronic device emits RFI when it's powered. Designers go to great lengths to shield their equipment to isolate it from outside interference. But sometimes, due to either similar frequency range or pure signal strength, the interference occurs anyway. Sounds like that's the situation with the lamp. You don't mention whether you are listening to AM or FM, but I can tell you for sure that AM is very susceptible to power line interference . The EMI travels not only through wires, but through the air too. It's likely the EMI radiation from the lamp is bombarding the receiver, or you're listening to AM and it's being picked up by the AM antenna. Solutions: 1. easiest, move the lamp. 2. make sure the outlet that the receiver is plugged into is properly grounded. You can buy a $10 or $20 tester at that orange store that will confirm that the receptacle is both properly wired and properly grounded. Grounded equipment is much more resistant to EMI than ungrounded. 3. if you really need the lamp there, you can try inserting a grounded metal object between the lamp and the receiver. (I'm thinking maybe a painted baking sheet with a wire running to the outlet cover screw). Doe the lamp dim? Dimmers are notoriously noisy from an EMI perspective.
Your final question: EMI is always there, the trick is to effectively shield it. Note that your audio cables are round. This is for a reason. They are two-conductor. The center conductor carries the actual audio signal. The other is a braided shield wrapped around the center conductor. The shield is connected to ground on both ends, and is very effective at blocking EMI. So it's likely that the cables do a good job isolating your phono from noise. However, this isn't possible at the phono cartridge, which is designed to pick up magnetic 'noise', and if you hold the lamp close to the cartridge you will certainly pick up noise. It's always best to keep your audio equipment isolated from all other electrics - both on their own circuit and physically away too. Note that many people use RFI and EMI interchangeably. RFI is radio-frequency interference, typically caused by and effecting radio transmitters and receivers. But in radio, you're always concerned about harmonics, which often dip down into a range that interferes with audio. Hope this helps, and yes, this was the wrong place to ask and I'm equally guilty for answering here...
Your final question: EMI is always there, the trick is to effectively shield it. Note that your audio cables are round. This is for a reason. They are two-conductor. The center conductor carries the actual audio signal. The other is a braided shield wrapped around the center conductor. The shield is connected to ground on both ends, and is very effective at blocking EMI. So it's likely that the cables do a good job isolating your phono from noise. However, this isn't possible at the phono cartridge, which is designed to pick up magnetic 'noise', and if you hold the lamp close to the cartridge you will certainly pick up noise. It's always best to keep your audio equipment isolated from all other electrics - both on their own circuit and physically away too. Note that many people use RFI and EMI interchangeably. RFI is radio-frequency interference, typically caused by and effecting radio transmitters and receivers. But in radio, you're always concerned about harmonics, which often dip down into a range that interferes with audio. Hope this helps, and yes, this was the wrong place to ask and I'm equally guilty for answering here...
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