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STATIC NOISE MOBILE SETUP IN BIG TRUCK

A

anixon

Member
Jun 11, 2006
52
0
16
nj
start out with. over 7 diffent cb's, 3 new antennas,4 new mounts and 2 18' coax. 4- new plastic washers on mount to.
the problem was with everything i try above.
meter runs only at about 1-2 lbs at all times. i get static noise all the time. i can transimit just fine but recice is only good at about 1-2 miles and the noise is loader then there volice. if they are closer then 1 mile they over ride the noise and the meter runs truer. the swr i have had 4 radio shops check it and they all tell me its a 1.4. i have a swr meter and it reads 1.4. i have even taken a heavy pc. of wire and ran it from the mount to the door hingle. and there was no change. this noise and rec. is the same with truck running or stop with key off. power supply i used factory supply and then run right from fuse box. this has factory mount on drivers door mirror and still the same thing. truck is a 2004 mack vision with mirror mounts. any help
 

right now running cobra 29 with noise cancelling mic. with k40 antenna.
also on the coax you have the inner and outer cable. outer is ground. why is it when you screw that on to a mirror mount and then place that plastic washer on top of mounting hole so mount stud does not ground out. but my thing is. isn't the big bottom part of stud ground because you screwed the coax on to stud. and also if the inner is (i will say positive) and when you screw the antenna on to the nut on top of mount there is no contact with the center section. i mean if the nut is 1" long that the antenna screw into and the antenna only screws in 1/2" where is the contact with the center. i hope this make sense.
 
"this noise and rec. is the same with truck running or stop with key off."

If you have a power inverter, turn it off. The problem you are describing with truck on or off, different antennas, different radios, etc. would lead me to believe that you have something running in the truck all the time that doesn't go off with the key. More than likely something you or someone else added to the truck that isn't normally there.

Mopar
 
DON'T HAVE A INVERT.
don't run truck execpt to go from point a to b. company has a heater and cooling system setup in truck for comfort. heater when use, only uses 1 gal. per 24 hrs use.
the same noise is in another truck of the same type to.

maybe it may be me, because i had cb's in the early 70's to late 70's and had no problem talking with other drivers 7- 10 miles apart. maybe then days are gone with the world changing. and old this new so called tech. junk out there.
 
thanks will do. i'm going to truck sunday and hook radio up to my pick up for power and just use antenna on big truck and see what happens.
i'm just tried of all the noise all the time if you know what i mean. i have brought cobra's galaxy connex and general lee. and had the same problem. i figured it was radios. but later buying another radio had the same problem. makes me mad because the connex and gen. lee were the talking machines. i will check on steer fuild to.
thanks
 
As sixbrix said, check for anything that is charging, or on in the truck. I had a very similar problem and finally tracked it down to the cigarette lighter adapter for my XM radio. It made no difference whether the XM was on, or off; S-3 noise level. Even when the XM was unplugged from the adapter, the noise was present. But, I unplugged the adapter and the noise went away. It could even be the AM/FM radio built into the truck. I had one that generated noise as long as it had power to it (The clock, I think). Start pulling breakers and fuses, one at a time and see if the noise goes away.

Rich
 
The company I work for has installed a computer in all of their trucks that tracks a lot of different things--idle time, instances of hard braking, log book information (it does our log books for us), etc. That computer puts out quite a bit of RF noise. I finally was able to reduce that noise by unplugging the handheld keypad/display. Unplugging it did not interfere with the data being recorded, but did reduce the RF noise by a lot. I now can hear between 10 to 20 miles where before I was lucky to hear more than 5.
 
spiderman5095 said:
The company I work for has installed a computer in all of their trucks that tracks a lot of different things--idle time.
Click to expand...

We used to call those things a "Tattle Tale" except they charted on a round piece of paper.
 
Try the "shirtpocket AM radio" trick. For this you'll need a small AM radio, which you tune between stations to an unused frequency.

Stick the radio under the dash, up by the headliner, under the hood...EVERYwhere. Listen for where noise gets louder, then see what's in the neighborhood that can cause it.

With the key out of the ignition and the noise present in the radio, try disconnecting the antenna to see if it's coming in on the antenna or on the power leads.
 

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