Help on ignition noise.

[SIREX]

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

[SIREX]

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

[KB1LKR]

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?

[K0BG]

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

[KA2VTI]

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