The coil over plug noise here was eliminated for the most part by using
copper tape to cover the coils. Then some shielding from RG-213 coax cable
( or Rg8..whatever you have) was then soldered to the copper tapes on all
cylinders, then grounded together. I had noise generated by the disc brakes
on my car. When the static level builds up (frequently) I step on the brakes
and it cuts off like a switch. It does not immediately come back but soon
does. Anti-stat powder in the tires was suggested but I never found any.
(You can see some of this inside new tires when you buy them.) Electric fuel
pump noise is a bear for those with the pumps inside the tanks like on many
Ford products. There is information on the web about those who were able to
conquer it...as I recall some had to go into the tank to get to the pump
which was how I remembered the fix. What a hassle...thanks Ford. Electric
cooling fans on cars are common rather than the old belt driven fans. The
leads to these should have bypass caps. Bonding the exhaust system to the
frame....in several places in possible. Doors, trunk lids, hoods, all should
have straps with star washers beneath through the paint. My Chrysler 300 was
one of the quietest mobile platforms I had ever driven after these things
were done. -Mike
-----Original Message-----
From: KD8NNU
Sent: Sunday, October 04, 2015 9:30 AM
To: Michael Coslo
Cc: rfi@contesting.com Reflector
Subject: Re: [RFI] Auto quieting
Ignition and injector noise on deceleration these are turned off to save
fuel.
It's the same controls as my Ram pickup. The noise blanker in my ic7000
takes it all out after proper bonding was done. Including bonding the
engine block. With the coil over plugs on my hemi I was not able to
eliminate the noise with chokes like I was able too on my JK jeep with the
3.8l engine.
Thanks
Don
Sent from my iPad
On Oct 3, 2015, at 9:28 PM, Michael Coslo <mcoslo@comcast.net> wrote:
Good evening all,
My mobile installation in my 2013 Jeep Patriot went well, and is operating
FB.
I do have a bit of noise, but something is a little odd about it.
Driving along with my foot on the gas, there is a noise like ignition
noise, it raises and lowers the number of bursts just like you would
expect, but here’s the odd thing. Going downhill, and letting off the gas,
the noise diminishes, and then goes away completely, leaving nothing but
ambient band condx. Quietest mobile installation I’ve ever heard. As soon
as I hit the gas again, it starts again.
Now that’s kind of saying fuel pump to me, but every other vehicle I’ve
had, fP noise is a high pitched whine.
Anyone have any ideas?
-73 de Mike N3LI -
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