| Author |
Message |
    
Dmh
Junior Member
Username: Dmh
Post Number: 19
Registered: 5-2002
| | Posted on Wednesday, March 15, 2006 - 12:47 pm: | 
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HY TECHS!! I am having monster radial tire static problems on my CB in the big rig. Do any of you guys have any ideas to solve & reduce the noise. Allow me to describe it....driving at night when stopped absolutely no static , my RF meter is all the way to the left when no one speaks. Now I start rolling the noise level moves to the right to almost a 5-7 on the RF meter. Now if the pavement is wet , there will not be any noise either. I guess I can turn the RF gain up thereby reducing my receiving but, why run a radio w/ no receive ?? Any of you guys ever work with this type of problem ?? |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1306
Registered: 9-2004
| | Posted on Wednesday, March 15, 2006 - 11:01 pm: |
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here's a thread about that exact problem, and i think powdered graphite in the hubs fixed it.
check the thread to be sure:
http://www.copperelectronics.com/cgi-bin/discus4/show.cgi?tpc=34&post=110410#POST110410 |
Rldrake
Intermediate Member
Username: Rldrake
Post Number: 114
Registered: 1-2006
| | Posted on Thursday, March 16, 2006 - 4:34 am: |
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I doubt if it has anything to do with radial tires. What led you to that conclusion?
Sounds like it might be more likely related to a wheel speed sensor (pulse genrators) if the truck is equipped with an anti-lock brake system.
Or maybe, but less likely, the vehicle speed sensor.
It only occuring at night seems odd. |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1311
Registered: 9-2004
| | Posted on Thursday, March 16, 2006 - 6:52 pm: |
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rldrake, have you read the thread that i directed him to?
it sure sounds like tire static to me.
the fact that it goes away when driving on wet pavement really leads me in that direction.
it seems to be a problem almost exclusive to truck drivers these days, so we dont hear about it too much.
either way, the graphite is a cheap fix, so give it a shot.
matt |
Chad
Advanced Member
Username: Chad
Post Number: 737
Registered: 11-2004
| | Posted on Thursday, March 16, 2006 - 10:25 pm: |
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Rldrake said:
I doubt if it has anything to do with radial tires. What led you to that conclusion?
It happens, even in ham bands. Ever notice a noise increase when passing big trucks?
It's sooo broad banded it even sets off lesser radar detectors! I have never had a problem with sat radio but even FM messes up, it totally trashes AM reception at times. Especially in the winter here in Illinois when it gets dry as a bone.
Check it out, it blew my mind when I finally found out what it was! I soon plan to grab a spectrum analyzer and make a trip. I'll be able to save and print the plots, If I get a really noisy one I'll post up a pic of the results 
Chad |
Rldrake
Intermediate Member
Username: Rldrake
Post Number: 116
Registered: 1-2006
| | Posted on Friday, March 17, 2006 - 3:09 am: |
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Kid v...
The thread you directed him to was not up here yet, when I posted. Interesting. And as you said, it certainly is worth trying.
Chad...
I have never had any type of interference from a truck with any broadcast receiver or any ham rig.
The only ham rig in a mobile that I have ever had a noise problem with was a little Yaesu FT817...that thing was totally useless in a mobile environment.
On the broadcast bands...I very, very rarely listen to FM stations, and have never had any problem from a truck on AM.
Your radar detector going off around trucks...I would think would be more likely caused by some of the GPS stuff in the trucks nowadays or the deal for the weigh stations.
He originally mentioned his noise problem as being a night time thing. That still seems odd.
Another thing that came to mind is if he is running heated mirrors on when this is happening.
Personally, I have never experienced "tire static" while driving a truck...but it has been quite some time since I have driven a truck on a interstate highway, so I'm not really up on them and all the modern accessories/electronics on board.
At interstate speeds, the last truck I drove was a 1973 Kenwood cabover...so it's been awhile...and that was the only truck that I drove on the interstate that had radial tires...so I don't have much experience with them. |
Bruce
Senior Member
Username: Bruce
Post Number: 3654
Registered: 9-2003
| | Posted on Friday, March 17, 2006 - 5:56 am: |
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The problem is real try a drag chain or a conductive strap draging on the ground |
Chad
Advanced Member
Username: Chad
Post Number: 739
Registered: 11-2004
| | Posted on Friday, March 17, 2006 - 9:07 am: |
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What went wrong with the FT817? I always thought it looked like a REAllY cool unit! It's nice to know that, thanks!
At night the roads are less traveled, more cars=less static dissapation. The tires of the truck are acting like a big vandegraff generator.
It really does exist, it really is a problem.
Chad |
Wildrat
Advanced Member
Username: Wildrat
Post Number: 837
Registered: 12-2003
| | Posted on Friday, March 17, 2006 - 12:32 pm: |
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I put this in the other post on the subject but without a response, so here is my question again.
Did you just pop the wheel bearing hub off and put the graphite in the cap? |
Dmh
Junior Member
Username: Dmh
Post Number: 20
Registered: 5-2002
| | Posted on Tuesday, March 21, 2006 - 8:38 am: |
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Wildrat & Rldrake, To possibly answer your questions ....To add the graphite, I think all that would have to be done is remove the rubber plug, pour in the graphite. On the other posting there is even a measurement of graphite to use . I haven't tried it yet BUT I WILL & I will let everyone know the results. I very much appreciate the link for the brand name & part # for the graphite. Now to Rldrake; the reason I made mention of the noise level is ....at night the propagation & related skip etc. is much, much lower & you can just hear the static noise much clearer, the noise is there day or night ....you can just hear it better & be able to isolate the causes easier at night when the noise levels are lower. |
Tech237
Moderator
Username: Tech237
Post Number: 284
Registered: 4-2004
| | Posted on Monday, April 17, 2006 - 9:28 am: |
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Actually try powedered graphite in the tyrss themselves. This has been used quite successfully in the past |
Im4jc
Intermediate Member
Username: Im4jc
Post Number: 142
Registered: 11-2005
| | Posted on Monday, April 17, 2006 - 1:11 pm: |
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Hmmm, very interesting. It could be that te reason that I don't have the problem is because I use all-purpose oil in the hubs of my old 96 KW W900 instead of synthetic. I read the link to the other thread and will chalk that one up in the old memory banks to help out other drivers.
Usually when I pass a big truck that makes my static go up to 9 S-units, it ends up being a huge power inverter that is the culprit. (Once I inquire on the radio about why the truck generates so much RFI, that is). As to the inverter problem, I've heard that it can be fixed by getting rid of the modified sine wave phase corrected inverter and going with a pure sine wave inverter. |
Im4jc
Intermediate Member
Username: Im4jc
Post Number: 177
Registered: 11-2005
| | Posted on Saturday, September 09, 2006 - 12:42 pm: |
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Hmmm. I just developed the static problem out of the blue. See other thread for fix.
Wildrat: Yes, just remove rubber plug on hub and squeeze tube until empty. Mine only took about 30 miles to get properly mixed and the static went away. |
