feedback noise

Make sure you have a very good ground to your CB and the antenna, make sure you have good power.

On a fright liner I always would wire my CB to the fuse box, But I would wire it to the batter terminal that sits on the side supplying the fuse box with its power.. Then I would ground my CB to the Sub frame of the cab by removing the plastic upright by the fuse box and using a bolt. simply buy some eye hooks to use on the end of you CB power/ground cord, crimp it really good and reinforce with black tape..

I always ran a thick gage wire from the CB antenna mount to a good ground as well.. Not really necessary but was a reinsurance thing for me..
Done right and you will see no wires.. just take your time in setting it up..

After doing that I haven't had an issue with feedback threw the speaker on the stereo.

Now if you have satellite radio and you are using the FM transmitter and not a direct connection YOU WILL GET FEED BACK unless you stop using the FM transmitter and get a direct connection..

The CB will simply bleed over to the FM transmitter wave and come threw the stereo speakers...

 

I had the same problem with my 48T. Was using a FM transmitter and it would kill it and bleed over the FM speakers. I have always just run the wires straight to the batteries. Just remember to turn it off.

I've never had a problem with it messing with my guages in the peterbilt except for the tach. It will make it jump now and then. Now my father and I tend to run the same type of radios and he's in a KW. The 48T would make half his idiot lights come on and would absolutely kill the FM radio no matter what. Found that the mirrors aren't grounded on them due to rubber grommets in the bolt holes. Grounded the antennas and it got better. Still can't get the SWR where we want them on his. We both went to the Connex 4300-300 and it was a new world of nightmares for the both of us. I finally got mine 90% lined out but his is just jacked still. Strangest thing of his is.. after a few seconds of being keyed up the cord spring on his astatic mic (here the cord goes into the mic itself) gets cherry hot like it has power running through it. We're still trying to line it out but he may just throw the 48T back in or get the 400w ranger when it comes out. I may just go back with the 48T. It seems to be a more solid radio.

 

The mic spring getting hot is a ground problem with the mic. Tell him to get it fixed....IT WILL SHOCK Him eventually. Been there....done that!

One of the good features about the Galaxy's is they have the self adjusting SWR's .....If you get it close the circutry will take over and level it out.

 

What kind of shop have you been listening to that a radio will self adjust SWR's Man i bet you bought some SWR grease to from that same person. Oh well some one has to make money off the uneducated and buyer beware so if i was you i would do a little reading on radio theory and operations before i went to giving advise on the operation of a radio and antenna system. NO SUCH THING AS SELF ADJUSTING RADIO. There is such thing as an auto tuner for tuning a mismatched antenna to make the radio think its resonate but it's not in a Galaxy radio i assure or they would cost way more than they do. they are a 200.00 to 300.00 accessory for most ham riggs. And then they are very simple tuners and want handle much of a mis match.

 

The mike spring getting hot is a result of RF feed back from the system telling you there is a better ground between you and the ground then between it and a ground system ground every thing the radio the antenna and even the cab to the frame and your problem will go away. Its not electric power its RF coming threw and it will burn you real bad if it get to your skin so ground it all to get rid of it.

 

Thanks! We're actually gonna work on it soon, maybe today. He's getting a burn mark on his palm from it. Its grounded straight to the frame. We'll run a strap from the antenna to the frame, the mirror to the frame, then the cab to the frame and see if that helps. Also may move the actual CB ground wire. The RF feedback makes sence. Its killing his FM, turns on all his dummy lights when he keys up and they get brighter and dimmer as he talks.

 

SELF ADJUSTING SWR

its not self adjusting its self calibrating, it takes one step out of tuning the antenna, all it does is calibrate the meter rather than you needing to do it yourself. everything still needs to be done the same.

 

woah!! no way do they cost that much, i have 2 of them (that i no longer use because id rather have my antenna tuned properly) those things dont cost anywhere near that much. maybe they would jack the price of a radio up by that much but those things cost less than a hundred and are real easy to find for 5 bucks. check ebay, ive found them at garage sales. their are plenty of places. but stay away from a 200 to 300 dollar one cuz my 5 buck ones work

 

Alright... now what? The antenna is grounded to the frame. The mirror is grounded to the frame, the radio itself is grounded from the mount to the frame, and ran 2 battery cables from the cab to the frame to ground it. Its still doing the exact same stuff. Starting to think its the radio itself, but the Galaxy DX48T did similar stuff as well, just not quite as bad.

 

Try relocating you Stereo antenna father away from the CB antenna.