Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148 gtl new model

I have purchased two of these radios,when i transmit on lsb everybody says i am distorted an unaudible.I took the first one back.The second one wont transmit on sideband.I use to love the old 148 but the new one is a piece of junk.I called cobra in chicago and talked with customer service.The answer to my problem i recieved was turn the voicelock(clairifier)all the way to the right and the anl off....?WHAT? i believe cobra has a big problem with this radio and wont admit it. Their customer service is less than desired.What can i do to solve this problem

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Re: cobra 148 gtl new model

Hello bluzfan, Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.

Posted on Oct 07, 2007

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I have an cobra 148 gtl no transmit

If theres no carrier its either the finals or driver. If theres no audio its the white wire in the plug that screws into the radio..its either broke or most likely come unsoldered. It keys but no audio.

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Oct 25, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl-st wont transmit but receives great

Check first your microphone

• check if TX is engaging when PTT is pushed.

• check for continuity ( mic and cable )

If you have not done these steps,

try it first, or borrow other compatible mic for Cobra 148GTL

from your friends on air.

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My cobra 148 work well on am but not on lsb

clipping the limiter should not have prevented tx on sideband are u sure u didn't do something more accidently. r 131 is the correct limiter for the 148. just out of curiosity what year 148 is it?

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Apr 25, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I dont really have a problem

AT 27.285 ON CHANNEL 19 OR 27.335 CH 35 AND SO ON.

Mar 11, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl

Open the radio up and find the L22 Can/Pot. It's the one with the wire soldered on top. With both fine and coarse Claifier/Voice Locks in the 12 O'Clock positions, confirm, then listen for someone that is on the correct frequency and turn this pot (small ferrite core inside) with a small plastic preferred screwdriver, until they sound clear. Do this for USB as well except, the Can/Pot is L59. Don't adjust the VR5 (transmit) unless you need to.

Oct 06, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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