anyone with a 07 with a cb???

hardhittinz · **Joined:** Tue Jul 03, 2007 10:44 pm **Posts:** 195

reasin i ask im still gettin noise il be goin down road hearin and talkin to guys and i get this noise that comes in and takes out my recieve and eventually goes out and i get my ears back.Any help would be appericated.

BugginKJ · **Joined:** Mon Jul 06, 2009 7:35 pm **Posts:** 4576

Ground issues maybe?

JeepinJarhead03 · **Posted:** Thu Feb 10, 2011 11:47 pm

sounds like a floating ground

ie:the vehicle is building static as you go down the road

try two things (depending on how you have it grounded etc at the moment)

put a ground strap on the exhaust to the chassis, and / Or ground a piece of bicycle handbrake cable to the chassis and strip the end off of it so it makes a wirey "fan" to dissipate static buildup

TnRebel · **Posted:** Fri Feb 11, 2011 7:26 pm

There are three main sources of noise on most vehicles that enter via the antenna.

#1. Fuel system - mainly the electric fuel pump and the injectors (the pump is easily detected as it causes the noise when you turn the ignition key to ON (not Start) and then if it is like most pumps, it will pressurize the fuel lines and the cut off).

I have seen people use bypass capacitors on the power leads for the pump, near the point where the pump wires enter the gas tank. I have heard of some vehicle companies providing RFI (Radio Frequency Interference) filters to car owners who have severe problems.

#2. Ignition system - the spark plug wires are like little antennas with a spark gap transmitter hooked to them.

I have read of people taking the braid off of coaxial cable and making sleeves for the spark plug cables, etc. MUCH work and no guaranteed results. I have heard that some HAMS have had good luck with some very pricey ignition cables....$100+ for a set of wires but they have suppression built into them and the owners claim they worked well. Sorry, I don't know the name but the search engines on the web should help here.

#3. Alternator - usually detected in the radio as a whistle or whine and follows the engine speed. Commonly enters the radio via the power leads but can enter via the antenna too. This does not appear to be your source of noise.

Concerning #2 above....I have had good luck reducing the ignition noise in my KJ by grounding the exhaust system. I put a ground strap (the shield from large size coax cable....but any good copper braid would work) about 10" back from the end of the tail pipe. I used a stainless steel radiator hose clamp to attach it to the exhaust pipe after thoroughly wire brushing that area of the exhaust pipe nice and shiny. The other end of the copper braid was attached to the frame.....wire brush it clean too and screw it down tight. I soldered a terminal lug on this end of the copper braid.

Well, that is about all I can pass on. There are books available at ham radio stores that deal specifically with vehicle RFI reduction, if you get serious about it. They will no doubt have more ideas to try than I can remember here.

Good luck!

anyone with a 07 with a cb???

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