Problem with Quad box and CB, Help?

[ECappleman]

When ever I key my mike it almost kills the truck. Also seems to run a little interference on the CB.

My power wire for the Cb does run next to the Quad wiring, but the antenna coax, goes out the back.



Any one else notice this or have a solution?



Thanks

 

[testraub]

My box does the same thing when I key up running my amp. When running the radio stock it's ok.

 

[ECappleman]

Unfortunatly mine is stock a still does it.

 

[Pawpaw]

The most probable and easiest fix is to ground the CB case. Use a wire size 18 or bigger with a terminal lug on each end. Loosen one of the case screws and put one lug there. Run the wire in as direct a path as possible to a good metal point on the body or frame. Don't put any loops in the ground wire.



I'd estimate there's a 99% chance that will fix your problem. If not, go to Radio Shack and get a noise choke to go on the hot wire to the CB.



CB radios are notoriously (RF) leaky devices. A little diligence goes a long way.



Bob

 

[Pawpaw]

One more thing.

Where did you tap into a hot wire for your CB? The best place to get power for a CB is directly off the battery. An automobile battery is one of the best noise filters there is.



Make sure you put a fuse as close to the battery as possible. 1 or 2 inches is best. You don't want any chance for the wire between the battery and the fuse to short out. A short between the fuse and CB will just blow the fuse. A short between the fuse and the battery could result in a burned-up truck.



Bob

 

[ECappleman]

The most probable and easiest fix is to ground the CB case. Use a wire size 18 or bigger with a terminal lug on each end. Loosen one of the case screws and put one lug there. Run the wire in as direct a path as possible to a good metal point on the body or frame. Don't put any loops in the ground wire.



I'd estimate there's a 99% chance that will fix your problem. If not, go to Radio Shack and get a noise choke to go on the hot wire to the CB.







Bob

Now this would probably kill the interference to the CB, but what about the Quad box picking up the signal and killing the truck? Would this solve the leaking signal on the output side?



Oh, and I am hooked directly to the battery.



Thanks

 

[ECappleman]

Also what is a LOW-PASS Filter ? Would that stop the interference to the Quad box?

 

[BIG BOB]

This is a very common problem with the Quad. I have seen many post of guys having problem with CB's and Quads. I'd dump the Quad and get a TST or Juice. Never have heard of any problem with them and CB's.

 

[testraub]

PM me with a phone number I'll be happy to try and work it out. Stock _should_ work fine.

 

[BIG BOB]

Check out this:



Quad and a Truckers Radio experience



Quad are the only box that are having these problems. I would check into other boxes.

 

[ECappleman]

Why is it just the Quad boxes?

Why are they so different?

 

[ECappleman]

Just tried a few things, which didn't help and this time it set off engine code P0192 (Fuel Rail Pressure Sensor Circuit Low Voltage).

Hmmmmmm

 

[Pawpaw]

Now this would probably kill the interference to the CB, but what about the Quad box picking up the signal and killing the truck? Would this solve the leaking signal on the output side?



Oh, and I am hooked directly to the battery.



Thanks

It will help with any RF that is leaking into or out of the CB chassis itself. Shielding works both ways. What I can't do is guarantee is that it will solve your problem. If the Quad is inherently prone to picking up interference, you may not be able to fix it.



Other things you might try is to make sure your CB's power & ground leads, and coax is as far from the Quad box (and its wiring) as possible. If the wiring must cross, try to do it at right angles.



This is a gremlin that might be easily fixed, or it may not be fixable at all. It sounds like there are others on here that can give you better advice on that.



I'm just trying to help you identify things that can cause problems. I've seen interference that would go away when a wire was moved one inch away from the source. I've seen other interference problems that could not be solved.



Bob



On Edit: A "noise filter" is actually a low-pass filter. You want low frequency signals (DC power in this case) to flow through it, but you want to block high frequency signals (RF). Using one will probably not do much to help in your particular situation. If you do decide to try it, install the filter as close to the CB as possible.

 

[ECappleman]

Finally got rid of most of the problems. It is down to a mild stutter when I first key the mike. Had to use 4 ferites on the line. It makes a difference putting one also on the remote switch wires.



Do you know if this problem will effect reception or transmission of the CB?

 

[dezeldog]

I to have this prob but now its down to a shudder. Right now I have two ferrites on, one on the coax and one on the harness, both double wraped. Cappleman are all four on the harness or do you have any on the coax???



Jim

 

[ECappleman]

Well they were 4 for $10.

I have 2 on the harness line and 2 on the remote switch wire.



I tried one on the coax and + power wire on the CB and found it not to have any effect. Did you try it with and without?



Does this seem to effect the CB at all on yours?

Here in Houston, there is some much trash in the air, its hard to tell.

 

[Task125]

Check out this:



Quad and a Truckers Radio experience



Quad are the only box that are having these problems. I would check into other boxes.

my radio is stock and I put 8 of those rf chokes on quad wires and cb wires. truck went from stalling when mike was keyed to running like crap. I gave up :{

 

[dezeldog]

Cappleman, No it does not affect the CB as far as receiving I just can't transmitt. I'm going to try two more, one on the harness and the other on the coax. I'll post results.



Jim

 

[ECappleman]

I found more was not better. Two on the main harness wire, and two on the remote wire.

I did not use the Radio Shack ones though. They were longated snap on ferites (sp).

 

[DennisPerry]

ECappleman and others,



I will post this just to help you guys out and not slam the product you are using. I have looked into this problem for a guy who came into my shop with the very same problem with his Quad box, and I hate to be the bearer of bad news but there is not a quick fix for your problem. Upon inspecting the unit to find the problem, this is what I observed.



1st off There are no EMC Caps or Ground planes on these boards at all. At minimum you need a large ground plane and EMC caps to help prevent the exact noise problem you guys are describing.



Not trying to start problems, but your efforts will not get get you the satisfaction that you are looking for. The entire board must be relaid out, which means every Quad box would have to be recalled. You purchase a module to perform safely and as advertised you should not have to be out running around to find parts to make it operate correctly.



Any box that kills the trucks motor needs to be taken off immediately for your own safety.



I know of no other module on the market having these problems.



Dennis

TS Performance

www.tsperformance.com