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Author Topic: Help on ignition noise.  (Read 437 times)
SIREX
Member

Posts: 52




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« on: July 23, 2004, 10:15:23 PM »

I have a 1998 Chevy 4 wheel drive 1/2 ton pickup with the 5.7 liter Vortec V8.  I have grounded everything you could ground even the exhaust.  I have 2 noises one when I hit the brake and the other is ignition noise. I know this because it increases as I accelerate.  This is my first mobile set up.  So where do I start to cure or reduce this noise.

Thanks in advance.

73,

Shayne, AA9FU
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SIREX
Member

Posts: 52




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« Reply #1 on: July 23, 2004, 10:26:28 PM »

I should have told you the radio and ANT.  Icom 706MKllG and a High Sierra Sidkick.  All noise in is on HF.

Thanks

Shayne, AA9FU
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KB1LKR
Member

Posts: 1898




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« Reply #2 on: July 24, 2004, 10:41:56 AM »

A thought: it could also be alternator noise, which changes w/ engine speed too. Alternator is more a whine and less a static/impulsive sound.
Do you have ferrite beads on the power leads of the radio (and/or elsewhere?)?
Is the antenna hard mounted and solidly grounded to the chassis?
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K0BG
Member

Posts: 9863


WWW

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« Reply #3 on: August 04, 2004, 10:43:56 AM »

You can go to mt web site and listen to four different sound usually encountered in mobile radio. At least it is a start.

Alan, KØBG
www.k0bg.com
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KA2VTI
Member

Posts: 4




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« Reply #4 on: August 31, 2004, 01:53:03 AM »

The noise you may well be hearing could be the injector pulse signals from the control module to each injector or bank of half of the injectors.

I am currently working with Ed Hare W1RFI on similar issues in a diesel application.

E mail me direct with RF interference in the header to flag your note as to not being spam and when we have a general fix figured out I will contact you.

Frank Giambrone
ka2vti@arrl.net
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