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Kenwood TK-7180 Distributor Noise

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Batt54

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Jun 25, 2011
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Veneta, OR.
I am dealing with noise from the HEI distributor on an 1987 Chevy V30 service truck. I have ran as many grounds as I could find and cleaned and reconnected/replaced as necessary as well as added grounds up to and including additional grounds to the radio chassis. Thus far I cannot get the popping from the distributor to clear up. I have even put in RFI suppressing spark plug cables in.. I'm at a loss.
 
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Batt54

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Veneta, OR.
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Power is supplied from a Blue Sea Systems DC sub panel mounted three feet from the radios. Thatsubpanel is fed directly from the battery. I've tried a few different noise filters, replaced the distributor cap (it was bad) But still no improvement. I've even considered shrouding the distributor. Is it possible the RFI is resonating through a lack of grounding in the exhaust system?
 
12dbsinad

12dbsinad

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The first thing you need to figure out is if the noise is being induced thru the DC power of being picked up by the antenna. That way you can know which way to attack the problem. Adding DC filters, etc will do nothing if it's being induced thru the antenna.

Easy way to check. Un thread your antenna from the radio, start the truck, and take a handheld or another radio in close proximity and key it on a simplex channel. If the noise is gone, your problem is the antenna is picking up noise somewhere. If it still does it, its being induced thru the DC power.
 
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