| Noise on XM radio [message #225885] |
Wed, 16 October 2013 19:59  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Have an XM satellite radio. Lately, we haven't been able to hear it because of a spark plug noise...at least it is tied to RPM.
Any of you radio guys have any ideas on how to go after this?
I'm at the Dixielanders fall rally in Gadsden, Al
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: Noise on XM radio [message #225887 is a reply to message #225885] |
Wed, 16 October 2013 20:03  |
rickmike
Messages: 252
Registered: September 2011
Location: United States
Karma: 0
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Consider the noise suppression capacitor inside the alternator.
Rick M.
1974 26' Canyonlands
aka "The General"
Clinton, TN
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| Re: Noise on XM radio [message #225888 is a reply to message #225885] |
Wed, 16 October 2013 20:07 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Is the XM playing through the stock radio? Do you have Mag-core ignition wires? You need to determine if the noise is coming in on the DC or through the RF side.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Noise on XM radio [message #225889 is a reply to message #225888] |
Wed, 16 October 2013 20:27 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Any noise on your standard radio? Tune to a blank spot on the dial and listen for it. Really need to determine if the noise is riding in the 12v line or coming in on the antenna. Bad spark plug wires can create RF noise, spark system is a good broadband broadcaster. Noise that follows RPM points to ignition system as culprit.
Try changing the ground connection or cleaning the current spot. Dirty grounds can be crude rectifiers.
XM converter power connection could be suspect. Using the cigarette lighter as source?
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Noise on XM radio [message #225897 is a reply to message #225889] |
Wed, 16 October 2013 22:15 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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ground loops!
make sure everything is well grounded
I have sirius and it's excellent
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: Noise on XM radio [message #225910 is a reply to message #225885] |
Thu, 17 October 2013 01:37 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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You need to determine how the noise is getting into the radio.
What does it sound like? If it is popping, then suspect ignition noise. If it is more of a whine then suspect alternator or fan motor induced noise. I'm not familiar with XM but if you can disconnect the antenna at the radio, disconnect it and see if the noise goes away. I realize that you will also not hear any stations with the antenna disconnected but listen to any dead spot and turn up the volume.
You can also try temporarily disconnect the alternator or heater fan and see if the noise goes away.
If it uses a grounded body mounted antenna, suspect that the ground at the mounting as corroded or oxidized.
While we are on grounds suspect a ground loop. This why I tell people not to run two parallel ground paths. Most do not listen because they know better. How is the chassis of the radio grounded?
In the past on vehicles WITHOUT a wooden floor and fiberglass skins (like a GMC), I have had to do things like run braided ground straps to hoods, and doors, and exhaust pipes. This really does not apply in this case because so much of the GMC body is not metallic.
We really need more information on what it sounds like.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Noise on XM radio [message #225916 is a reply to message #225885] |
Thu, 17 October 2013 05:58 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Come see me. A-11, this eveningh.
--johnny
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On Thu, 10/17/13, Kerry Pinkerton <Pinkertonk@MCHSI.com> wrote:
Subject: [GMCnet] Noise on XM radio
To: gmclist@temp.gmcnet.org
Date: Thursday, October 17, 2013, 12:59 AM
Have an XM satellite radio. Lately, we haven't been
able to hear it because of a spark plug noise...at least it
is tied to RPM.
Any of you radio guys have any ideas on how to go after
this?
I'm at the Dixielanders fall rally in Gadsden, Al
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being
re-bodied as an Art Deco car hauler
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Noise on XM radio [message #225923 is a reply to message #225885] |
Thu, 17 October 2013 07:33 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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We'll be neighbors Johnny, I'm in A09. The XM is fed indirectly from the cigarette lighter from a multi-adapter setup (1 into 4 female lighter sockets). I have an aftermarket radio that had an input plug on the front panel and the XM plugs directly into that.
The noise is definitely tied to the engine rpm. It starts out as high frequency clicks and at speed is more of a constant whine. Impossible to listen to the radio.
Earlier this year I drove down to Ken Hendersons and had the same problem. Plugged and unplugged everything and it went away. Since then, I have a new Paterson distributor with his wires also.
That solution no longer works.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] Noise on XM radio [message #225933 is a reply to message #225910] |
Thu, 17 October 2013 09:24 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Oct 17, 2013, at 2:37 AM, Ken Burton wrote:
> You need to determine how the noise is getting into the radio.
XM uses digital modulation therefore noise getting into the RF side of the radio (antenna, feedline, preamp) is most unlikely to make it through to the audio path in a recognizable form; if the noise is strong enough it will cause a complete muting of the output when the radio's decoder can no longer make sense of the incoming bit stream.
I'd suggest temporarily powering the XM radio from a 12V battery (lawn mower battery, 2 6V lantern batteries in series, or perhaps even a 9V battery will be enough) rather than the vehicle's DC system. If the noise goes away when on the temporary battery then you know the noise path is via conduction through the XM's power cord.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: Noise on XM radio [message #225954 is a reply to message #225885] |
Thu, 17 October 2013 12:01 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Right. Unlikely coming in on the digital side, but thought it might be on the receiving radio if FM. Is the cable between the 2 radios (most likely 1/8" TRS) shielded? There are thin speaker wire cables in that 1/8 format for computer type small speakers which would be unshielded.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Noise on XM radio [message #225992 is a reply to message #225923] |
Thu, 17 October 2013 19:54 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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per our conversation, have a look tonight and eliminate the ignition system - which being all new is not a prime candidate. 'Whine' points to alternator, cruise control transducer (!) and pretty much anything electric spinning wiyth the engine. I couldn't bring my swept analyzer, it's being used. But we can look and tinker till we find the culprit. Grounds and bypass components around the alternator are prime suspects.
--------------------------------------------
On Thu, 10/17/13, Kerry Pinkerton <Pinkertonk@MCHSI.com> wrote:
Subject: Re: [GMCnet] Noise on XM radio
To: gmclist@temp.gmcnet.org
Date: Thursday, October 17, 2013, 12:33 PM
We'll be neighbors Johnny, I'm in A09. The XM is fed
indirectly from the cigarette lighter from a multi-adapter
setup (1 into 4 female lighter sockets). I have an
aftermarket radio that had an input plug on the front panel
and the XM plugs directly into that.
The noise is definitely tied to the engine rpm. It
starts out as high frequency clicks and at speed is more of
a constant whine. Impossible to listen to the radio.
Earlier this year I drove down to Ken Hendersons and had the
same problem. Plugged and unplugged everything and it
went away. Since then, I have a new Paterson
distributor with his wires also.
That solution no longer works.
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being
re-bodied as an Art Deco car hauler
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Noise on XM radio [message #226012 is a reply to message #225885] |
Fri, 18 October 2013 00:14 |
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Jerry Sitzlar
Messages: 206
Registered: February 2013
Location: Lenoir City, TN
Karma: 4
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It's a common problem with sat radio that uses the aux jack for the receiver module and powered by the cig lighter. It is a DC power problem. A simple filter can be had from several sources, one is www.tssradio.com. Go to their site and search for the PIE 5 amp noise filter. Should do the trick. It's $9.95.
Jerry
Jerry Sitzlar..... 77 Eleganza II, Twin bed, dry bath...... Lenoir City, TN (near Knoxville)
[Updated on: Fri, 18 October 2013 00:16] Report message to a moderator |
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| Re: Noise on XM radio [message #226061 is a reply to message #226035] |
Fri, 18 October 2013 09:33 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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| rf_burns wrote on Fri, 18 October 2013 07:08 |
My vote is with the ground loop too. Radio is grounded in one place and cig. lighter is grounded at another.
Try running the XM off a stand-alone battery and see if the noise goes away. If it does then try running the XM off the power wires going into the radio.
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I also wonder if there is a bad diode in the alt. Radio whine through the power has to be pretty severe to show up as noise in the audio.
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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