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weird interference on AM radio #4717429
04/05/18 05:30 PM
04/05/18 05:30 PM
Joined: Apr 2018
Posts: 3
USA
JamMan Offline OP
JamMan  Offline OP
Joined: Apr 2018
Posts: 3
USA
Hello! I have a Chevy 2013 Malibu. Nobody has been able to find the following problem, not the dealer, not my own mechanic, nor a car audio guy I know....

I am a big sports radio fan and enjoy AM radio. For some reason when running the A/C I get a whistle whiny sound and to make it worse, while charging my phone, I get a hiss/static noise. This doesnt happen on FM or it is very minimal while listening to FM. When I run the A/C full blast the whiny whistling sound pitches higher then finally goes away....Also when I unlock and lock the doors, you can here a quick noise of static through the speakers while the AM radio is running.

The radio sounds fine with no phone charging and no a/c running....Any suggestions? Thanks!

Re: weird interference on AM radio [Re: JamMan] #4717433
04/05/18 05:38 PM
04/05/18 05:38 PM
Joined: Dec 2011
Posts: 743
US
clarkflower Offline
clarkflower  Offline
Joined: Dec 2011
Posts: 743
US
I get that too in NC (on the coast)

Last edited by clarkflower; 04/05/18 05:38 PM.
Re: weird interference on AM radio [Re: JamMan] #4717435
04/05/18 05:42 PM
04/05/18 05:42 PM
Joined: Jun 2014
Posts: 1,968
IL
Vern_in_IL Offline
Vern_in_IL  Offline
Joined: Jun 2014
Posts: 1,968
IL
Oh man this will be [censored]. Modern cars put out all sorts of harmonics. Even from passing cars I can get the whrilllllll from their engines on the radio.


https://www.popularmechanics.com/cars/how-to/a84/1272491/

Quote:
Now that you've pinpointed the noise, what can be done about it? It depends on whether your RFI source is broadcasting or cabling the noise to your radio. This matters because the cure is different. Try pulling your radio's antenna lead out. If the noise goes away or is substantially quieter, it's coming in through the antenna. If the noise stays the same or gets louder, it's coming in along the 12-volt power cables.



Quote:
A cheap AM radio makes a good Geiger counter-style device for hunting down RFI. Here, we're looking for an alternator with a bad diode. Mind your fingers.

Last edited by Vern_in_IL; 04/05/18 05:43 PM.
Re: weird interference on AM radio [Re: JamMan] #4717485
04/05/18 06:40 PM
04/05/18 06:40 PM
Joined: Jun 2003
Posts: 17,354
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,354
Deplorable in apple valley, ca
My dad told me about this decades ago. He said that 99% of people dont listen to AM radio. And that the AM receiver in newer cars was built poorly and that the FM was built much better for this reason. Am is more susceptible to noise from outside sources, throw in poorly made noise filters or none at all and you get poor AM reception.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: weird interference on AM radio [Re: JamMan] #4717501
04/05/18 06:47 PM
04/05/18 06:47 PM
Joined: Dec 2017
Posts: 1,037
US
JLTD Offline
JLTD  Offline
Joined: Dec 2017
Posts: 1,037
US
Welcome to AM. You can try shielding, filtering, improving the stereo but the frequency coming over the airwaves is still going to be corrupted at times.

I recall when I first started driving, at a certain time at night I'd get an AM station from somewhere in California. I lived on the East Coast at the time.


I'm a thickie; but a 20 has its place.

I use AMSOIL

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 41k, OE 5w20/Wix

Re: weird interference on AM radio [Re: JLTD] #4717571
04/05/18 07:29 PM
04/05/18 07:29 PM
Joined: Apr 2012
Posts: 5,156
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,156
MA
Originally Posted By: JLTD
Welcome to AM. You can try shielding, filtering, improving the stereo but the frequency coming over the airwaves is still going to be corrupted at times.

I recall when I first started driving, at a certain time at night I'd get an AM station from somewhere in California. I lived on the East Coast at the time.


AM is amplitude modulation and is more susceptible to noise than FM. That's why they used to have resistored spark plugs otherwise you'd pick up noise from the engine. Not much you can probably do about it. You could try a different type of charger, it's probably the circuity in the charger that's putting out that noise. Try wrapping it in aluminum foil.

Also AM is almost like short wave, travels further in the ionosphere at night, in daylight the sun tends to kill the signal.

Re: weird interference on AM radio [Re: JamMan] #4717686
04/05/18 08:58 PM
04/05/18 08:58 PM
Joined: Aug 2004
Posts: 1,467
San Antonio, Texas
sasilverbullet Offline
sasilverbullet  Offline
Joined: Aug 2004
Posts: 1,467
San Antonio, Texas
If you love AM so much find an old AM/FM radio from a early 70's Lincoln or Cadillac. They were built much better back then.


03 Porsche 911 Liqui Moly Leichtlauf High Tech 5w-40 & Mahle filter
14 Honda Accord 4dr EX-L 4cyl-M1 0W-20 & WIX XP
02 Chevy 5.7L van-GTX HM 10W-40 & WIX filter
Re: weird interference on AM radio [Re: JamMan] #4717709
04/05/18 09:18 PM
04/05/18 09:18 PM
Joined: Sep 2015
Posts: 1,528
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,528
USA
The big difference in the 1970s was in the tall metal fender mounted antennas. Printed on the window or little stubs are not going to work well with the longer waves of AM.

Re: weird interference on AM radio [Re: JLTD] #4717774
04/05/18 10:24 PM
04/05/18 10:24 PM
Joined: Jun 2003
Posts: 17,354
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,354
Deplorable in apple valley, ca
Originally Posted By: JLTD
Welcome to AM. You can try shielding, filtering, improving the stereo but the frequency coming over the airwaves is still going to be corrupted at times.

I recall when I first started driving, at a certain time at night I'd get an AM station from somewhere in California. I lived on the East Coast at the time.
that's called skip. Am radio waves travel much farther at night.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: weird interference on AM radio [Re: JamMan] #4717823
04/05/18 11:19 PM
04/05/18 11:19 PM
Joined: Mar 2018
Posts: 216
Chicago
Jooksing Offline
Jooksing  Offline
Joined: Mar 2018
Posts: 216
Chicago
Try a better phone charger, cheap circuits gives off electronic noise. Also check the grounding on your radio. All else fsil. Look at in line filters. Ferrous filters..https://youtu.be/jbv9PUC0xPk

Re: weird interference on AM radio [Re: JamMan] #4717838
04/06/18 12:12 AM
04/06/18 12:12 AM
Joined: Feb 2014
Posts: 2,288
Kansan,1911 45ACP fan
Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,288
Kansan,1911 45ACP fan
Got a great stereo and the AM acts up in Kansas City around 11am. Its like it trying to interfere with my listening to my advanced conservative studies on the EIB network with Rush. I like XM Radio but its gotten really high in price.


15' Civic 179k.0w20 Redline/Archoil9100,Eibach,Yokohama/Borla Exhaust/Tein Suspension/Fu7317/Redline Si-1
Right to work state proud. Non union household
Re: weird interference on AM radio [Re: Marco620] #4717850
04/06/18 01:19 AM
04/06/18 01:19 AM
Joined: Apr 2012
Posts: 5,156
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,156
MA
Originally Posted By: Marco620
Got a great stereo and the AM acts up in Kansas City around 11am. Its like it trying to interfere with my listening to my advanced conservative studies on the EIB network with Rush. I like XM Radio but its gotten really high in price.


How much are you paying for Sirius? I normally call them and tell them I'm going to cancel unless they can give me $30 for 6 months. Been doing it for years. I think there's a thread about it around here.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4678001/Re:_Who_here_has_satellite_rad#Post4678001

Re: weird interference on AM radio [Re: JamMan] #4718035
04/06/18 07:51 AM
04/06/18 07:51 AM
Joined: Jun 2015
Posts: 4,225
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,225
New England
Avoiding interference in the AM band is a huge problem these days for electronics, many circuits will switch right in that range and that's not even thinking about harmonics. AM is a pretty crummy old technology when you get right down to it.
I would try an OEM charger if you're not using one already (assuming that your phone is a major brand) and also make sure your battery connection is rock solid, that's a nice big filter on the line in your car even when it's being charged by the alternator. A super cheapo charger from the dollar store is not likely to really meet the EMI standards it claims, one I bought at DG actually makes a fair amount of audible noise but I don't care in its application.

BTW, I use Sirius but it will get hosed up by power lines on my way to work and also drops out in patches when I drive up to ski...it's not totally reliable, either.

Last edited by Virtus_Probi; 04/06/18 07:52 AM.

2014 Forester XT, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: weird interference on AM radio [Re: Virtus_Probi] #4718280
04/06/18 11:46 AM
04/06/18 11:46 AM
Joined: Jun 2007
Posts: 439
Near Mobile
ffhdriver Offline
ffhdriver  Offline
Joined: Jun 2007
Posts: 439
Near Mobile
Years ago I had interference on an aftermarket AM radio from the blower motor for the HVAC. I reduced it to almost zero by putting a capacitor in line with the radio feed wire.

Re: weird interference on AM radio [Re: JamMan] #4722467
04/10/18 07:56 AM
04/10/18 07:56 AM
Joined: Dec 2006
Posts: 1,700
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,700
NY, NY
It's aliens talking to each other about us. Didn't anyone see Signs?

Last edited by NYEngineer; 04/10/18 07:56 AM.
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