am radio noisy on new radio install

G

Gregory Kleverlaan

Just replaced the stereo in my car (Subaru Liberty GX 1994) with a pioneer
DEH-P4650MP (mp3/wma/cd/tuner) whilst everything works fine. I find that the
AM radio is very crackly and noisy when the engine is turned on. If the
ignition is in the Accessories position AM radio is fine.

I've also replaced the car areal with an oem replacement.

What I need to know is how to eliminate the crackling and noise from the AM
radio that appears as soon as the engine is turned on.?


p.s. never had this problem with the old deck which was an OEM clarion
AM/FM/Casette unit.
 
Let me know if you find a solution. Both my OEM and now my Alpine units get
bad RFI from the engine, wiper motors, and fluid sprayers. Radiosmack sells
an RFI filter, but that assumes the RFI comes in through the power....
LT
 
Gregory Kleverlaan wrote & <(e-mail address removed)> Jan 20, 2005 at
05:29 PM

Just replaced the stereo in my car (Subaru Liberty GX 1994) with a pioneer

DEH-P4650MP (mp3/wma/cd/tuner) whilst everything works fine. I find that
the
AM radio is very crackly and noisy when the engine is turned on. If the
ignition is in the Accessories position AM radio is fine.
I've also replaced the car areal with an oem replacement.
What I need to know is how to eliminate the crackling and noise from the
AM
radio that appears as soon as the engine is turned on.?

p.s. never had this problem with the old deck which was an OEM clarion
AM/FM/Casette unit.

Guessing you're in Oz with a Liberty. Suggest maybe some sort of
suppression problem on the ignition side else the aerial could use some
attention &/or tuning in. Whereabouts are you?Any decent car audio guys
near you who are good with troubleshooting am? Cheers
 
Are you using shielded cable from the antenna to radio? Is the shield
grounded at both ends?
 
Gregory Kleverlaan said:
Just replaced the stereo in my car (Subaru Liberty GX 1994) with a pioneer
DEH-P4650MP (mp3/wma/cd/tuner) whilst everything works fine. I find that the
AM radio is very crackly and noisy when the engine is turned on. If the
ignition is in the Accessories position AM radio is fine.

I've also replaced the car areal with an oem replacement.

What I need to know is how to eliminate the crackling and noise from the AM
radio that appears as soon as the engine is turned on.?


p.s. never had this problem with the old deck which was an OEM clarion
AM/FM/Casette unit.
Run a large bonding strap from the chassis of the receiver to the METAL
firewall. Make it about 1/2 inch wide. The negitive lead from the head unit
is NOT a "RF" ground.
Make sure the metal under the antenna mount is clean, most important.
 
Edward Hayes said:
Are you using shielded cable from the antenna to radio? Is the shield
grounded at both ends?

I am still using the existing OEM cable running from the Antenna/motor to
the radio head unit. It was just the antenna mast with wip cord that was
replaced. Not the actual cable and motor which didn't need replacing.
 
----- Original Message -----
From: "Dr. Rastis Fafoofnik" <(e-mail address removed)>
Newsgroups: alt.autos.subaru,rec.audio.car
Sent: Friday, January 21, 2005 6:35 AM
Subject: Re: am radio noisy on new radio install

Run a large bonding strap from the chassis of the receiver to the METAL
firewall. Make it about 1/2 inch wide. The negitive lead from the head
unit
is NOT a "RF" ground.
Make sure the metal under the antenna mount is clean, most important.


Looks like I've worked out what the problem is. Just a matter of working out
a solution.

Seems to be a poor connection on the connection where the areal cable that
runs from the back of the Head Unit and plugs into the antenna motor unit.
Although the connection is seemss solid and tight. I can jiggle the
connection and hold the cable in particular position and the signal is ok.
But as soon as I let the cable go the
interference noise is back, Maybe the cable has iintermittent break or
something at the socket end?
 
the AM portion of all modern car stereos is just an after thought.
They put about $1 worth of IC chip in the stereo and that is the entire AM
portion of the stereo.
It doesn't matter if its Kraco, Pioneer or Alpine
 
Dr said:
Run a large bonding strap from the chassis of the receiver to the METAL
firewall. Make it about 1/2 inch wide. The negitive lead from the head
unit
is NOT a "RF" ground.
Make sure the metal under the antenna mount is clean, most important.

In the interests of fairness, let me thank you for your informative and
probably accurate post.
Cheers
 

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