This is probably child's play, but I noticed that I'm hearing engine noise (whine, changing pitch with RPMs) through my CB. At 80mph I'm squelching out most useful conversation. Do I have a bad ground, or do I have a coil going bad, (Maybe that would explain my rough idle?) or is it something else? Electrical gurus (cough*Griggs*cough) help me out here!

 

Check your ground and make sure its solid and isolated...also make sure your ANT. coax isnt touching anything.

 

when i tern my winshield wiper fluid on, my cb squelches. is this just interference?

 

yeah, try a gound loop isolator

 

I had the same problem, basically i found the cb was to close to the engine. I now have my CB under my armrest (farther away from the motor) and it doesn't make that noise anymore.

 

Well, perhaps of value, I haven't moved any of my CB components since I installed it before last year's Centralia fall meet. The noise is new. I did take off my 5' whip because the spring was wearing out, now I'm running the 3' firestikII with no spring on the same old post-hole mount.

 

hmmm....did you tune the firestik to the cb?

 

No, I don't have a meter, but I've switched back and forth between the two for quite some time now. I only put the 5'er on semi-permanently when I moved and the truck no longer got garaged.

 

I was hoping to avoid a few hours of diagnostic time wasted if someone with specific experience could relate their findings to me. Obviously I could do a bunch of work to isolate the problem.. but I've had so little free time lately I'm over 500miles overdue to change the oil, if thats any indication.

 

Well change ur damn oil. A healthy truck is a lot better than a f'd up one.

Aaron

 

buy sheilded cable, fixed my buddy's problem

 

Well, considering that for quite some time everything worked fine WITHOUT shielded cable, I sort of want to know what went bad before I start upgrading. I guess I'm old fashioned like that, I get more satisfaction out of fixing it than upgrading it. (Although I love when it can't be fixed, because THEN I get to upgrade!)

 

Our trucks are an elecrical nightmare when it comes to elec noise. I got all sorts of hum on my one 2 way. I tryed eveything and never could get it to go away, like you it just started one day.

Check the wires and coax, make sure it did not wear through or chafe (SP) the shielding under the dash or under the hood.

 

With my CB whip (4ft Wintenna), after the antennas supposed to ground? I have mines through my back bumper, the part that transfers the coax cable threads into the CB mount threads, are they supposed to be grounded? Thanks and I know this thread is a bit old.

 

999% bad ground probly caroted[sp?] now..

 

corroded.. and 999% is alot!

 

well my radio did same thing, it changed with RPMs figured out it was one of the spark plugs arching...so I went to ford and picked up new wires and plugs

 

Whining or whistling heard over the CB that changes with engine speed is generally caused by the alternator and a dirty or loose ground..
My solution was to remove and clean all the factgory ground connections that I could find along with installing about 8 more made up of 1/2" braded grounding strap with soldered connectors and copper conductive paste under the connector. The new grounds were attached between the bed and the cab, the bed and the frame, the cab and the frame and the exhaust system and the frame in 3 places....
The extra grounding help remove the whistling and increased the receive/transmit signals due to an increased ground plane provided by more of the truck body being used as the ground.
I run a ICOM 706 MK2G with a Sirio 7/8 wave antenna on a Wilson 5K mag mount using LMR 240 coax. When the SKIP is rolling.... I can talk to Florida, Oregon and even Australia at the end of the work day.....

OR 4x4

 

i had a similar problem with mine and moved my ground.....that got rid of 98% of it...the rest i can just squealch out.

 

mine does it sometimes.. i just turn it up..and pretend im supercharged

 

a buddy of mine is having a lot of problems with his radio and his s10. he gets a loud squeel around 60-65+ mph and some more interference..
what would be a good ground loop isolator to use?

 

There is no good 'loop isolater'. The best filtering to get is one that's like the following link...

http://cgi.ebay.com/Workman-Bandit-C...QQcmdZViewItem

BUt first...have you found out where the noise is coming in at? Pull the coax off the radio while the radio is on and the noise is presant. If the noise goes away....it's coming in through the antenna. Then you'd need an antenna noise filter. But....if the noise is still there...then it's coming through the power wire or ground wire. Ground wire should already be as short as possible. Same with the power. imo...i'd get power for the cb from a cigerette lighter or something inside the rig....no in the engine may. Routing of the coax makes a difference too....no looping it up to take away the excess.

 

If it's coming through the antenna, you need a notch filter... Just like I do because of the high voltage and frequency of both pairs of HIDs I have on the truck...

Notch filters can run anywhere from $30-$300+ depending on how bad the problem is.

 

Thanks for the reply, I'll tell him