The squelch control is probably damaged. They aren't very sturdy. Controls on radio's these days don't take a lot of abuse. Luckily, the replacement parts can usually be found on EBAY and aren't expensive but you will have to install it yourself or take it to a shop and have it done if you aren't technically inclined. It's not a difficult job to do but a shop will still probably charge more than the radio is worth to do the repair. If you can find a HAM nearby, you might be in luck.
SOURCE: My Squelch on my Cobra
It means either the knob or something in the squelch circuit has gone bad. Doesn't mean that you cannot use the radio, you will just hear static all the time when no one is talking. If the static bothers you, you can always back the RF gain down a bit. That will quiet the noise, but lower you receive range. meaning you won't hear as far away.
SOURCE: how to set up the cobra 19 DX IV CB Radio
first keep the manualhandy for the radio and antenna you are using. start by finding a good mounting point for the radio. install the bracket and cheeck the fit with the radio. next run the included power cord from the back of the radio to the fuse box. don't plug it into the radio yet. take the black wire and ground it to metal. try to find a screw goofyinto the metalof the car and loosen it, wrap the wire o. it and tighten it. next find thefuse for the stereo. pull it out and press I back inwith the red wire getting pushed into the fuse socket with the fuse. now you can plug in the radio. IMPORTANT! do not plug it in backwards. if you do you will blow out a diode in the radio and it will not turn on until repaired. turn the key on and then the radio. make sure it powers up BUT DO NOT KEY THE RADIO YET or you will damage it. the radio must never be keyed withough an antenna connected. mount the antenna as close to center of the car as possible le and according to theantennas instructions. run the coax to the radio and connect it tightly. now you need to tune the antenna for best SWR. there is a section in the radios manual and the antenna.manual that explains how to do this. rather then me type it all out you should have detailed I.structins already. if not let.me know and I will ppart it. after the swr is tuned for lowest you are ready to talk on the radio. enjoy.
SOURCE: cobra 148 gtlcobra 148 gtl DX
http://www.cbtricks.com/radios/cobra/148gtl_dx/index.htm
Nice choice of radio i have the Grant LX Uniden which is roughly the older version.
This site may be of interest also if you choose the channel mod make sure you have the right PLL. http://www.radioaficion.com/HamNews/mods/mods-cb/2428-uniden-grant-xl-mods-pll-agc-power-clarifier.html
SOURCE: how to modify a cobra 19 ultra iii cb
i got a couple of them and i have them talking really good for what they are. if you go inside you can turn up the pods also you can take a small screwdriver and spread those coils inside near the back of cb!
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