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Interferance & Static

philta

By philta,
in Car Audio & Electrical

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philta Community Regular

philta

Posted
Posted (edited)

ok, its getting quite annoying now, because i cant seem to diagnose the problem.

prob: right channel has static (not radio static like but LARGE burst to cracking noise)

i only had 1 acessories line out, so i join them both to the enable amp and auto attenna.

i then tried to seperate the amp/e and auto attena. (amp to acc so when the deck is on the amp is on)

but it still does it!

maybe the pre out are labled wrong? because im running the rca of rear L/R. have yet to try other RCA but i doubt that the prob.

maybe line in is mixed up with one of them.

just now i relise even when its not on radio the auto attenna line give off 12v when the deck is on. ( it should only do this when radio function is selected)

its on of those shitting china dvd deck that i got for my parents, other than that im quite happy with it, play avi too.

any1 might have an idea of what i should try, already open it up and check most of the components seems to be fine in working order.

so far im just running 1 speaker of right front, with no other connection and it works fine. any1 might have an idea of what might be interfering with each other?

thanks in advance

Edited by philta
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RANDY Veteran

RANDY

Posted
Posted

Umm.. for a start. The antenna doesn't give off 12v. Your "accessories line out" (remote) gives it power. That wire is only supposed to be for telling the amp to turn on. (via the amps "remote" wire). Hooking it up to the antenna control wire will make it go up whenever the headunit is on. (not just on radio)

If the headunit doesn't have a power antenna out wire, you might want to just hook up the antenna wire to a switch and do it manually. It sounds like you've tried to fix that when you were testing.

That out of the way, i'm assuming that your amp runs the speakers and not a sub? If so, swap the RCA input L and R from the amp and see if the noise swaps sides. If it doesn't, then you might have a speaker problem. If it does switch sides, then it could be the RCA cable or headunit.

Swap the speaker outputs on the amp from left to right also... that should test that the amp isn't doing it... and so on.

OH man.. re-reading this... you're using the REAR RCA outputs on the headunit to the amp... and then what? Running FOUR speakers from the amp? If so, use the front RCA output and see if the noise is still there. That will rule the headunit out too!

Trav33 Mentor

Trav33

Posted
Posted
If the headunit doesn't have a power antenna out wire, you might want to just hook up the antenna wire to a switch and do it manually.

The R33's have a switch on the dash for the antenna already. From memory (its been a while since i had audio in my skyline), if you turn your deck on, and are listening to an antenna, you can flick the switch which leaves the antenna down. Correct me if im wrong?!

RANDY Veteran

RANDY

Posted
Posted

I'm afraid you're mistaken =-]

The switch on the dash will give you either full-height or half-height when the antenna is already triggered to go up. Pressing "down" on the switch when the antenna is up will only bring it half-down.

It won't do squat when the antenna isn't triggered to move.

philta Community Regular

philta

Posted
  • Author
Posted

ahha ur just as confused as i am randy. LOL

switch is only for full or half lift of the attenna.

ok heres the f**ked updated.

speaker is fine, havent swapped the rca for left to right so wouldnt know. im powering a sub not speakers.

all my speakers run of the deck while the sub is off the amp.

so far ive tested with out the amp and its fine. (in that in mean with an external 12v batt without any rca connections or amp)

ill chuck in my old deck and see how that goes, just pisses me off how i dont know what the prob is.

RANDY Veteran

RANDY

Posted
Posted

ah ok... static... there's plenty of threads on this, and no "one" answer to solve them all (as far as i've ever seen).

Someone like Chris Rogers can probably fix it within a day if you put it in his hands, but diagnosing it yourself isn't easy without spares. =-[

I got the same kind of thing through my speakers, and I tried just about EVERYTHING (seriously!) So I changed my plans and just ran my sub from the amp, which is fine.. the alternator whine noise was too high-pitch for the crossover setting i'm using on the amp for my sub.

I got it ONLY on one pair of RCA's (I have two sets for output) If I switched them around, the sound would follow. Swapped cables, swapped amps, repaired burnt-out grounding track on the PCB of my headunit... all didn't help. I think my HU is still bad, but I don't have another one to test it with.

It could be anything from a headunit or amp dead ground (internally) or the RCA cables are faulty. For RCA, this can be a broken grounding somewhere along the way, crappy grounding which introduces noise past the battery or some ECU wiring behind the dash... you name it. =-/

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