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HELP with RF Static

Discussion in 'CB Radio Forum' started by wilson04, Jan 9, 2010.

Page 1 of 2
  1. Jan 9, 2010 #1
    wilson04

    wilson04 Bobtail Member

    4
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    Jan 9, 2010
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    I have alot of RF noise coming though the antenna of my semi. Here is my set up. I have a 99 KW W900L, 3406E Cat engine, Dx99V radio, Wilson 2000 antenna (SWR 1.3 on 1 & 40).

    Things I have gounded...

    Engine to frame.. both sides with 2ga. braided strap... 0.3 ohms
    Antenna to cab.. has good gound to cab... 0.3 ohms
    Cab to frame... (1) 2ga. braided strap... 0.3 ohms
    Radio to cab... 12 ga. wire 20in long (shortest rte. to gnd)... 0.3 ohms
    Alternator to frame... 10ga wire... 0.3ohms
    Power & GND.. 8ga wire to batt both PWR & GND.

    The radio has a S meter of .5 when truck is off. Channel 19
    The radio has a S meter of 4-6 when truck is on. Channel 19

    When I Switch bands from HI to LO while truck is on the S drops to .5. It seems the truck just has noise on the 40ch on CB band. The farther I tune away the quiter it gets.

    Do those ferrite chokes work from Radio Shack?
    How bout those .01 caps?

    What else can I do? Do I have any other options?
     
    wilson04, Jan 9, 2010
    wilson04, Jan 9, 2010
    #1
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  3. Jan 9, 2010 #2
    kd5drx

    kd5drx <strong>Master of Electronic Communications</stron

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    Nov 28, 2006
    Some where USA
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    Ok have you unhooked the coax and see what happens. If it goes away its coming from the antenna you need to slowly shut down the systems that are running till you find the one that is causing the noise. It may be alt or it may be injectors or it could be any one of a dozen things.
     
    kd5drx, Jan 9, 2010
    kd5drx, Jan 9, 2010
    #2
    rabbiporkchop and Oldironfan Thank this.
  4. Jan 9, 2010 #3
    wilson04

    wilson04 Bobtail Member

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    Jan 9, 2010
    0
    Yes, I have unhooked the antenna and yes it's coming in through it. I'm not sure how to isolate each item. I have a feeling it's the injectors. The static makes a "popping" sound. Kinda like when the pistons are firing.

    The whole system is pretty much new. The most recent addition was the wilson 2000. The coax, mounts, and power wire are all within 2mo. old. The noise has been there for long time now. I can only hear about 3-4 miles. And thats even hard b/c of all the noise behind the audio.

    I have tried different radio's and they all have that noise.
     
    wilson04, Jan 9, 2010
    wilson04, Jan 9, 2010
    #3
  5. Jan 26, 2010 #4
    Punisher1985

    Punisher1985 Light Load Member

    57
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    Jan 13, 2009
    The 715
    0
    You ever figure this out? Im in a 94 T600 and am having the same trouble although mine is not popping its is full of static. So bad the my squelch is 3/4 of the way up! I cannot get it!

     
    Punisher1985, Jan 26, 2010
    Punisher1985, Jan 26, 2010
    #4
  7. Jan 26, 2010 #5
    murph

    murph Light Load Member

    77
    10
    Jan 22, 2010
    0
    In the last few weeks I've been getting a lot of static on 19. To the point of were the meter will go to s6 all all you here is static then the meter will drop back down. The static will over-power the voices unless the drivers are within a mile or two. It will last for a couple of miles.
    It doesnt do this on any other channel only on 19.
    I have to squelch it out to almost 3/4.
     
    murph, Jan 26, 2010
    murph, Jan 26, 2010
    #5
  8. Jan 27, 2010 #6
    marmonman

    marmonman Road Train Member

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    Dec 14, 2009
    central illinois
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    Is your radio run off the batteries or another power source?

    You can eliminate allot of back ground noise by going direct to the batteries.
     
    marmonman, Jan 27, 2010
    marmonman, Jan 27, 2010
    #6
    Oldironfan Thanks this.
  9. Jan 27, 2010 #7
    WA4GCH

    WA4GCH Road Train Member

    3,324
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    Aug 12, 2009
    Seminole Florida
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    Yep thats sometimes true
     
    WA4GCH, Jan 27, 2010
    WA4GCH, Jan 27, 2010
    #7
  10. Jan 27, 2010 #8
    murph

    murph Light Load Member

    77
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    Jan 22, 2010
    0
    Batteries.
     
    murph, Jan 27, 2010
    murph, Jan 27, 2010
    #8
  11. Jan 28, 2010 #9
    wilson04

    wilson04 Bobtail Member

    4
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    Jan 9, 2010
    0
    I ran 8ga. wire to both the + and - terminals on the battery. That seemed to help a little. I also bought some Ferrite Beads from DX ENGINEERING. I put a couple on the injector lines going into the engine and even put some on the cb coax itself.

    I seemed to get the S meter to a 0-1 most of the time. If I run my heater on high I will pick up a 1 S Unit. I want to put some more beads on the blower motor but haven't yet.

    On a side note, with my SIRIUS on I will also and up to 2 S units depending on the day. I haven't figured out how to eliminate that one yet. All in all I am fairly happy with everything now.
     
    wilson04, Jan 28, 2010
    wilson04, Jan 28, 2010
    #9
  12. Jan 31, 2010 #10
    Punisher1985

    Punisher1985 Light Load Member

    57
    14
    Jan 13, 2009
    The 715
    0
    Yeah mine was my inverter in this new truck was not grounded very well thats it! It only took me a month to find :biggrin_2557: haha!
     
    Punisher1985, Jan 31, 2010
    Punisher1985, Jan 31, 2010
    #10
    Oldironfan Thanks this.
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