cell phone static?!?!?!

[ryjay7887 10+ year member]

I just recently switched out my amp and relocated it to the back wall. Before this setup I had a kicker 600 watt mono amp under the rear seat. now Im running a 1200 watt pioneer mono and its mounted on the back wall. when I have my cell phone in the truck, I get that weird static interference. I only hear it when the volume is turned down on the h/u and it is not extremely loud but it defiantly is VERY noticeable. I never had it before on the old amp and the only thing i changed was I added a fuse-able distribution block to extend the power wire I already had, and I now have relocated the ground to the seat mounting bolts. My ground is very good. Besides those two things, nothing has changed. I feel that the problem is at the amp and not the head unit because when I hold the phone to more of the rear of the cab, the static gets worse. I have not yet determined if most of the static noise is coming from the subs or door speakers. any suggestions? I'm lost. thanks for anyone's help!

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[bw_audio 10+ year member]

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[ryjay7887 10+ year member]

so you dont think there is any way to avoid this problem? maby better grounding or....idk. just trying to eliminate this issue. there must be a way around it because what happens when those people who are loaded and get their custom sound system installed that costs thousands of dollars and this happens to them? there's got to be a fix. let me know if you hear anything. thanks

 

[shellfish 10+ year member]

I'm pretty sure its your speaker ire acting like an antenna

this is different from a ground loop, its an RFI problem

meh, that's my .02, look up Radio Frequency Interference it could be that maybe not i dunno/

 

[Tone415 10+ year member]

My sidekick doesnt do that..

 

[Sarthos 10+ year member]

My Samsung doesn't do that. Try using an old brick phone though, that'll give off major interference lol. What kind/gauge of wire are you running?

 

[shellfish 10+ year member]

Oh it might be your RCAs , are they shielded?

if i remember correctly, the idea is that if a wire if certain length it will pickup frequencys of that length

so ether shield the problem we of shorten it...

who knew being a HAM would pay off in car audio

ps if you moved the amp wouldn't you make all the wires longer...power, speaker, rca?

 

[Sarthos 10+ year member]

Well if a wire picks up frequencies of that length, I doubt that either the amp under his seat or the amp in his trunk would pick up frequencies that way because if its a 4 meter or a 5 meter or 6 meter or whatever long cable, it's gonna pick up frequencies of less than 1 hz isn't it? 1 Hz=1 meter wavelength IIRC so a 5 meter cable would pick up a frequency of .2 Hz which is several octaves below hearing range.

 

[ryjay7887 10+ year member]

yes, i moved my amp and I had to make the power wire longer..about 3 feet. Im driving a 2006 f150 extended cab so my wire has quite a way to go. Im running 4ga but where I had to add wire, I put in a fused distribution block (no splicing). and the ground wire is MAYBE 1ft. Also, my cell phone is a t-mobile G1. I get the static when I receive or send out anything (phone calls, text, internet...) Where I live, service is kind of sketchy so i look for signal quite often when driving. **** MAINE! my wire runs may be a little loose and spread out, should I zip tie them all close together in a bunch? Im not sure if this is kind of like coax cable (looping it in a tight circle so no interference)

 

[shellfish 10+ year member]

My girlfriends dvd player rca cables pick up my blackberry signal and only

my phone, however the only way you can fix it that i can think of is make

the wire shorter. How short? I don't know. Sarthos seems to know more

in this subject then i do (i only know the basics) so consult with him.

and nice phone btw //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif

 

[kappout 10+ year member]

general rule of thumb. things that transmit signal over the airwaves will get picked up by wires.

 

[JimJ 5,000+ posts]

Well if a wire picks up frequencies of that length, I doubt that either the amp under his seat or the amp in his trunk would pick up frequencies that way because if its a 4 meter or a 5 meter or 6 meter or whatever long cable, it's gonna pick up frequencies of less than 1 hz isn't it? 1 Hz=1 meter wavelength IIRC so a 5 meter cable would pick up a frequency of .2 Hz which is several octaves below hearing range.

Not at all correct.

One hertz is one complete cycle of the wave per second. It's a measure of frequency. Wavelength and frequency are inversely related - as you go down in frequency, wavelength increases.

Ferrite beads or toroids on the speaker wires may solve the problem, but the wires are already several wavelengths long at typical cell phone frequencies.

 

[ryjay7887 10+ year member]

So when ur refering to legthening or shortening wires...are you referring to speaker wire or ground/power wire

 

[shellfish 10+ year member]

i cant see the power/ground having anything to do with it.

rcas and speaker wires. Also like mentioned above you can try Ferrite beads to filter out the unwanted signal

 

[91Chevy 10+ year member]

Radio Waves may cause interference. I know that both my cellphone as well as my girlfriend's cause my computer speakers to freak out, but it depends on the frequency of the waves being transmitted.