How are you doing this? Is it an aftermarket deck? Is it rcas or a mini-plug?swel304 wrote: I am direct connecting to the line in on my in dash so its not the fm transmitter.
What kinds of installs have you done? Just curious.mikesolt wrote:I've done some stereo install in my day.....
what i'd do is get an in line filter....i'd also try another power source...as the interference is from power...not necessarilty the ground.
Also...check to see if yer wires are shielded. Shielded cables reduce interference and can help stop the interference.
let me know how things go
Terrence wrote:The direct connect input is still superior to the FM transmitter.
You could try buying a direct power line which runs off the battery instead of the lighter plug.
Filters will only mask the problem.
Ground is power fyi, it's part of the circuit...
And yes the ground on the cigarette lighter is more than likely is the problem, you can check this if you have a dmm, to see if your voltage is constant with other sources, and you could also check the resistance on your inputs to see if thats the problem, resistance should be under 1 ohm.(also, should show 00.00 not 0L)
If you decide to take out the adapter and hardwire, you can just cut the adapter off, and run it to your fuse box. But first, is your adapter wire and the signal output wire twisted, or close to each other?
Also if its not a plug and play, all the above still applies, but the antenna ground could be the problem too.
If you want to take the easy way out you can get one of these. But like I said, it's more of a band-aid than a fix.
How are you doing this? Is it an aftermarket deck? Is it rcas or a mini-plug?
I'm guessing the sirius is a plug & play module? Is the lighter plug adapter the only power source?
Have you tried using the fm transmitter instead of the aux, to check if it still whines, or plugged something else into the aux, to check?
Anakha wrote:Ground is power fyi, it's part of the circuit...
swel304 wrote:I actually have one of thos but thats not the kind of connections I need and I dont think that is going to filter out alternator noise as that is an audio ground loop isolator which would be in line after the alternator noise has already passed through the amplifier.
You can buy a mini-plug to rca adapter, if you already have the inline signal isolator.swel304 wrote:it is an aftermarket deck with an 1/8 stereo plug on the front for mp3 players ect..
Yes, I know, I was trying not to get to technical. I hope nobody would be looking at a DG forum for electricity lessons.garublador wrote:Anakha wrote:Ground is power fyi, it's part of the circuit...
*Engineer sense tingling*
I'm not trying to say you aren't right, I'm 100% sure you know more about automotive wiring than I do. However, I'm not sure I agree with this statement in general.
While you are probably right that the noise probably has something to do with power, when it comes to debugging it's generally a good idea to think of power and ground problems as different. Changing a power supply (alternator in this case) could fix a power supply problem (e.g. noisy 12V power), but wouldn't help if it was a ground problem (e.g. ground loops picking up noise). If things were't grounded correctly you could get noise even the cleanest power supply. I suspect that you already understand this, though, considering you're recommending a ground loop isolator instead of a filter for the power supply. I honestly wouldn't know which to try given the symptoms.
It's also true that electrons flow from negative to positive, but I'd advise against using that convention when talking about electircity in any sort of practical discussion. It's easier to think about a positive flow from the positive to ground when you're talking about electricity with others because, well, that's just how everyone does it. I understand this was just a little FYI, but I just wanted to say that to avoid confusion for anyone trying to learn about electricity on a disc golf message board.
With me around the chances of that are minimized.Anakha wrote:Yes, I know, I was trying not to get to technical.
Anakha wrote:What do you do, if you don't mind me asking?
Nice. I was going to go deep into EE and physics, but now, I've decided that I prefer to just go to work and not have to think about it at the end of the day.garublador wrote:Electrical engineer. I worked for 5 years at Unisys (enterprise level servers) up in MPLS in the PCB design group and now I work at as an EE for company that makes specailty equipment used in crop research, mostly planters and combines.
Anakha wrote:swel304 wrote:I actually have one of thos but thats not the kind of connections I need and I dont think that is going to filter out alternator noise as that is an audio ground loop isolator which would be in line after the alternator noise has already passed through the amplifier.
I don't understand what you're trying to say here, I thought you were having problems with the Sirius/power adapter, it would be before the amp, because you put the isolator(the one in the link) in the Sirius to receiver audio outs, which if the loop is caused from the power adapter on the Sirius, that would be the correct place.You can buy a mini-plug to rca adapter, if you already have the inline signal isolator.swel304 wrote:it is an aftermarket deck with an 1/8 stereo plug on the front for mp3 players ect..
Anyway, if this doesn't work, or you don't want to try it, you wouldn't have to rewire your car Just cut the lighter plug off the adapter, run the wire to your in-car fuse box, ground and pos. Simple.
Also I noticed you said you have a boss deck, could be the ground on the input. Do you have the whine using the input with anything else? Something battery powered?
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