Question about Cobra 148 GTL 120-Channels Base CB Radio

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My cobra 148 gtl-dx has excessive levels of white noise that effect even relatively close stations incoming signal. is there any way i can vary or reduce the ferocity of this white noise

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Goto you tube and type in cobra 148 gtl dx and look for video by the cobraman in the uk - or type in the cobraman - u can contact him and he is a bit of a genius on this radio - he will even make a video and show u how to fix prblem

Posted on Sep 21, 2008

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2 Answers

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

Nov 16, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

148 cobra with no modulation


possably corrosion on the pins of the plug into the radio, unscrew, push in and out a couple of times, and try again, maybe a break in the cable where it flexes the most. or faulty antenna

Oct 23, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Output power


There are 3 versions of this model. Here is how to turn up the power on all 3.

Early production model: Turn VR5 all the way to the left and turn VR11 all the way to the left.

Late production model: Remove VR14, turn VR13 all the way to the left.

if its brand new, its the easiest. Just turn VR6 all the way to the left.

Apr 21, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Want to disconnect the bleep out of my cobra 148 gtl dx


open the cover speaker side and look inside the radio look for a small square board that the previous owner might have had installed that would be the roger beep. the white wire is the audio wire. and usualy is soldered to the audio pin if you remove this wire the beep will be disconnected. but you will most likely want to remove the whole system but it will still work if you dont which would be best. just cut the white wire.

Feb 04, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

Want to disconnect the bleep altogether on my cobra 148 gtldx


If this is a stock cobra 148 gtl 40 channel am plus side band, they don't to my knowledge come with a built in r beep. Some roger beeps are instaleed through the transmit circuit on the mic, so if not in the know Don't try to fix it.Some microphones have a beep built in. I used to install beeps on these radios using the pa/cb switch to turn them on. also try the nb switch or the swr/rf switch.

Feb 04, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 GTL steady tone though speaker


try rerouting your coax cable and make sure it's long enough

Jul 07, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

5 Answers

Cobra 148 gtl Low / No receive audio


No audio out / low audio out....This is a constant problem with the COBRA 148 gtl....to get a good level of volume replace the
electro caps ...start around the two speaker wires and work back from there. I'm in the process of rebuilding a 148 gtl and have found caps that are leaky and dried out...after replacing nine the volume went up to a good level...now i need to fix the distortion
and background hash. Did you know that there are many posts
on FIXYA about this same problem I.E. great TX , great PA but poor , or no audio out. these sets have been made in sevetal countries...The sets made in Taiwan or China have poor quality
front panel pots (the carbon track is micro thin and simply wares through to the material the track is printed on) This has the same effect as removing a wire from a pot I.E. no audio. The good news is that 99% of parts in the radio are freely available and that includes the front panel controls. ONE WONDERS IF THE SET IS WORTH THE EFFORT !!!

CHEERS GUYS / GIRLS.

Nov 26, 2006 | Cobra 148 GTL 120-Channels Base CB Radio

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