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Old 10-05-2012, 03:40 PM   #1
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CB install issue

Hey guys,

just wrapped up my CB install in my 2012 JKU. Everything went fine and SWR readings are good. Ground is to a bolt under the console that holds the framework to the floorpan. Power I ran to my sPod.

My issue is that when I key the mic it aparently is interferring with something as my dash warning lights all come on, the wipers go on, the compass resets, the temp goes to zero...

Ideas?? The ground tests good if I am doing it right?

Eric

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Old 10-05-2012, 04:35 PM   #2
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Wow.... pinched wire somewhere?

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Old 10-05-2012, 04:47 PM   #3
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Wow.... pinched wire somewhere?

nope all clean runs...
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Old 10-05-2012, 05:20 PM   #4
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Anyone?? I'm stumped..I just also ran the power directly to the battery to eliminate the sPod and that's not it. That leaves the ground for the radio or the antenna ground if that can even do this?

Eric
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Old 10-05-2012, 05:23 PM   #5
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Well, start with disconnecting your antenna ground and see if that does anything... most antennas don't need to be grounded now anyways....
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Old 10-05-2012, 05:27 PM   #6
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Well, start with disconnecting your antenna ground and see if that does anything... most antennas don't need to be grounded now anyways....

I don't have a seperate ground on the antenna. I am using the Rugged Ridge mount directly on the tailgate door with a Firestik 4A stud, quick disconnect and 4' Antenna...
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Old 10-05-2012, 07:19 PM   #7
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Wtf? Disconnect everything and see if the problem persists.
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Old 10-05-2012, 07:22 PM   #8
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Wtf? Disconnect everything and see if the problem persists.

I know..I don't get it. I disconnected everything and reconnected and no change. The truck is fine with the CB powered on or completely disconnected. It's only when I key the mic.

I am stumped

Eric
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Old 10-05-2012, 07:23 PM   #9
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I don't have a seperate ground on the antenna. I am using the Rugged Ridge mount directly on the tailgate door with a Firestik 4A stud, quick disconnect and 4' Antenna...
I'll take a stab at it. If you haven't pinched a wire and your just running a little Firestick and not a 102" whip it has to be the radio. Is the radio new and even if it isn't it sounds like your getting backfeed voltage into your Jeep electrical system.

DC voltage should be exacty that. (Direct Current), but if you have a fault in your radio it may have backfeed, which one way to correct it would be to install a Diode which only lets electricity flow one way.

Where did you pull the positive feed to your rig? If you pulled it off the alternator it is AC and it will be alternating current?

More info please?

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Old 10-05-2012, 07:37 PM   #10
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I'll take a stab at it. If you haven't pinched a wire and your just running a little Firestick and not a 102" whip it has to be the radio. Is the radio new and even if it isn't it sounds like your getting backfeed voltage into your Jeep electrical system.

DC voltage should be exacty that. (Direct Current), but if you have a fault in your radio it may have backfeed, which one way to correct it would be to install a Diode which only lets electricity flow one way.

Where did you pull the positive feed to your rig? If you pulled it off the alternator it is AC and it will be alternating current?

More info please?

50 Something
I am running a 4ft Firestik with a 4A stud and the Rugged Ridge rear gate mount. Also a quick disconnect on the antenna. The power is direct to the battery and the ground for the radio is on a bolt under the edge of the carpet that bolts the console frame to the floorpan.

All componets are brand new....
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Old 10-05-2012, 10:31 PM   #11
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so what happens if you disconnect the ground?
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Old 10-05-2012, 11:07 PM   #12
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I am running a 4ft Firestik with a 4A stud and the Rugged Ridge rear gate mount. Also a quick disconnect on the antenna. The power is direct to the battery and the ground for the radio is on a bolt under the edge of the carpet that bolts the console frame to the floorpan.

All componets are brand new....
Run the ground straight to the battery with a jumper and tell me what that does?

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Old 10-05-2012, 11:10 PM   #13
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Run the ground straight to the battery with a jumper and tell me what that does?

50 Something

I will try that in the am and report back!! Someone else also suggested they had to grind the bottom hole surface of the rugged ridge mount to bar metal (remove the powdercoat) as well as teh back of the mount where it contacts the rear gate. I will do that as well..
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Old 10-06-2012, 10:53 AM   #14
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well...I am at a loss. This am I completely removed teh Rugged Ridge mount and ground the powdercoat off around the mounting hole for the antenna and the two flats where it firms up against the actual tailgate panel.

I also ran the radio ground directly to the battery.

I doublechecked SWR and it was under 1.7:1 all channels so the antenna is good.

I removed the meter and key'd the mic and boom...my wipers, all the dash lights, and chimes all started going off.

Not sure what else it could be other than a bad radio???
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Old 10-06-2012, 05:56 PM   #15
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ok..about to give up. To try to eliminate things I actually went and picked up another new radio and another new coax cable. I ran completely new lines to the battery (pos/neg) and I replaced the stud and double checked the ground at the antenna.

The SWR is low (below 1.4:1) but guess what?? I key the mic and all my interior electronics go ape shit...I just don't get it. The only thing I have not bought a second new one of is the antenna...maybe I need to try that now.

Eric
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Old 10-07-2012, 09:09 AM   #16
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Well guys I finally figured it out on a whim. I hope that this will help someone else if they experience this. Just on a gut feeling I suspected that this was RF feedback into the CANBUS system and the only place it could have been coming from is the rear antenna area. I have the hard top on right now and with the antenna mounted on the rear gate it puts it within just a few inches of the rear wiper motor. I unplugged the lead that runs from the truck to the top just like when removing it and BAM...no more problem. RF was feeding back into the CANBUS directly from the transmitting antenna into the rear wiper.
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Old 10-07-2012, 09:27 AM   #17
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Wow! Of all things, nice "whim". Glad you got it all worked out and I'm gunna stick this one in my files
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Old 10-07-2012, 10:06 AM   #18
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So, did you ever try it without the ground for the antenna hooked up?
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Old 10-07-2012, 02:23 PM   #19
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So, did you ever try it without the ground for the antenna hooked up?
I did. No change.
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Old 10-09-2012, 10:57 PM   #20
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So what if you use a taller antenna to move it farther away from the wiper?
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Old 10-20-2012, 09:38 PM   #21
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Is your 'fix' still working? Reason I ask - I've been having the exact same issue and have no hard top so the pigtail for the hardtop is stuffed inside the carpet. Never had an issue until I rewired the CB to the SPod. About to rewire it back off the SPod.
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Old 10-21-2012, 04:37 PM   #22
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The symptoms are definitely RF interference (RFI). Lots of wire in a vehicle and they act as antennas. One simple not-to-expensive thing you can try to so put snap-on ferrites on all suspect cables, including the antenna cables. The antenna coax can be radiating and it likely parallel to many other cables in the Jeep so lots of chance to induce trouble. The ferrites choke ranges of RF energy.

There is much more science behind ferrite composition, number of turns of wire around them (vs just snapping it on) and such, but there is a good chance that a few of them well placed will resolve the situation. Radio Shack used to sell the snap on Ferrites.

Try the cylindrical type that snaps of coax. The big square ones are for wrapping wire around some and usually used for audio or power wires. Using both types properly can be effective.
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Old 10-21-2012, 06:48 PM   #23
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if your cb is to close to the cluster the actual radio will interfere with cars radio and instruments bc of the power of the radios frequency. try moving it down a little
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Old 10-21-2012, 10:24 PM   #24
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While I thought it was the wiper motor, shortly after it happened again. I have not yet solved the problem. I am awaiting some bonding straps to bond the rear tailgate as well as the chassis of the radio as well to see if that helps. Frankly I am abotu to give up if this doesn't work...to many other 2012 jeeps that are owned by buddies have an identical setup to me and no issues. Start to wonder after awhile why mine is different.
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Old 10-21-2012, 10:25 PM   #25
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if your cb is to close to the cluster the actual radio will interfere with cars radio and instruments bc of the power of the radios frequency. try moving it down a little

After I get the bonding straps installed I will pull the radio from the mount and set it on the seat or something and see if that changes things.
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Old 10-22-2012, 06:21 PM   #26
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It is the RF radiated from the Antenna and coax, not the physical location of your radio. Your radio should have a low power setting (1 watt vs 4 watts) you can try. Also try moving your antenna as far as you can from the Jeep and see what happens. Most likely you will end up using the snap-on ferrite suggestion I mentioned. Moving the radio around is not likely to solve anything, maybe a long shot if there is interference conducted down the power cord, in that case see the ferrite suggestion again :-). If you have or can get a dummy load that can help isolate things also (reduces radiation on the coax).
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Old 10-22-2012, 10:37 PM   #27
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Good luck with this one. I had the same problem with my 07 Toyota tundra and was told by dealership and by the radio shop that radio was putting out too much power when keying mike which was interfering with electronics in truck. My radio had an amp built in. I did buy another radio without amp and had no more problems. I hope you find the answer because I could not.
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Old 10-23-2012, 12:48 PM   #28
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Also, the defroster elements on the rear window can cause similar issues. I installed my antenna on the rear tailgate the first time, and could get a nice tune with the tailgate open when it was away from the wiper motor and the defroster fringes. However, as soon as I closed the tailgate and those got closer, the performance would drop drastically. Had to move the antenna to the side of the Jeep away from these things.
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Old 10-24-2012, 07:06 PM   #29
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Interesting development tonight as I continue to try to troubleshoot this. First I grounded the tailgate with a bonding strap to the tub in the rear. No change. Key up the mic and the second I start to talk the electronics go nuts. Then I placed ferrite beads in numerous places especially wired in the vicinity of the rear gate area. No change. Same result. Then I relocated coax to the other side of the vehicle and away from any wires. No changes. Even ran the cable outside the car completely. No change.

Then just for kicks I unbolted the antenna mount from directly on the tailgate and just let it hang freely where it wasn't touching the truck metal to metal at all. Guess what. It didn't happen. To be sure I bolted it back up and electronics go ape shit. Unbolted it again and no problems. Seems with the mounting stud mounted as it should be to the metal bracket and the bracket mounted directly to the sheet metal it's impacting the can bus.

So the question is now what? Any ideas you radio wizards?

Eric
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Old 10-24-2012, 07:08 PM   #30
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Incidentally I then removed the ferrites and the bonding strap and as long as the mount isn't touching metal on the truck there is no issue.

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