Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148gtl tx/rx flashes between green/red and meter vibrates while mic is keyed, but only when you talk on sideband. Recieve is good. mic is old, but did work fine and all mic contacts are solid in plug and switch (re-soldered them to make sure)

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  • Cobra Master
  • 1,847 Answers

I'll bet that the A.W.I. is out of adjustment. give it a little twitch of a turn and see if the red light goes out.

Posted on Dec 22, 2014

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Posted on Jan 02, 2017

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SOURCE: cobra 148gtl

i am having this trouble as well. The ics was my thought too, but I think it is in the modulation circuit somewhere. another article i read said to check this. "Look for the collector of TR-23, you should read about 4.5 V with a dead key. If you find that this voltage is not present, check on the opposite side of R-120 for 6.5V. Most likely this voltage will not be present; if this is the case, C18 has shorted and needs to be replaced. This is a 330uf, 10V electrolytic capacitor beside L31. To prevent "future" problems, replace with a 16V unit." As of yet, i havent gotten that far. note this is from the cobra 2000, but they are very much alike. you might cross check the resistor capacitor numbers though. btw, isnt the mb3756 the pll ic?

Posted on Feb 15, 2007

SOURCE: cobra 148gtl

tomcat 1 back ...i have found the fault no modulation on am/usb/lsb.tr -23 a bc458 transister .replaced this transister and wow modulation on all 3 modes thanks zeppfrog for telling me where to look .

Posted on Mar 01, 2007

  • 1 Answer

SOURCE: 29 help

hi, sounds like you have a problem with the SWR' S Probably too high. Tumbleweed01

Posted on Mar 16, 2008

  • 9 Answers

SOURCE: Cobra 148GTL Missing TX Modulation

The problem is most likely the audio ic . open the radio and see if the diode 44 is blown or see if you see anything that looks like it got hot around the plug area. if not contact me and i will buy it. is it an old or new 148 gtl.Read more

Posted on Dec 06, 2008

  • 1 Answer

SOURCE: 148GTL Cobra (no tx)

the dx 2527 has a fine ransmitter. it is choked out by the factory to pass FCC reg's. With about $4.00 in parts from the rat shack you can really make it talk. my personal 2527 dead keys around 3 watts with around 45 50 watts on rms with bird meter around 60 with crappy dosey.

Posted on Jan 22, 2009

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Related Questions:

1 Answer

Good day I have an cobra 148 Gtl tx and rx a working but no out put


It might not seem obvious but on many, if not all, current CB radios have separate wires coming from the microphone for RX and TX. It seems like the mic wire for TRANSMIT may be open. It is a common failure.

Feb 28, 2015 | Cobra 148GTL

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How do I wire a MIC on a Cobra 29 LTD classic 4 pin mic?


would need to know the mic wire code you going to use. but half moon cut out at top as you look at it is top left 1-4 next row left side 2-3. 1 is cable/ unshield (common). 2 is MOD 3 is TX 4is RX... 1 is wire with no cover 2 is with cover rapped round wire RX is received TX is transmit, hope this helps. newer mic have different code wires so check with meter, red green and blue and shield is on some of the new wiring.

Oct 10, 2014 | Cobra 29 LTD CB Radio

1 Answer

My cobra 148gtl has low modulation on sideband. What can I do to correct this.


Check the Mic. Sideband you can talk up. ie the louder you are the more mod.

Jan 24, 2014 | Cobra 148GTL AM/Single Sideband CB Radio -...

3 Answers

Red lights come on tx n rx and antenna come on when I key up the cb radio and the swr meter doesn't move


if a mod has been done to the cobra 29 (all 29,s)the light will come on just find vr6 audio the radio as it comes on adjust vr6 untill it goes away,,,,always trust your watt meter(s.w.r scale)over the flashing light its really easy to do it beats paying a shop $10-$15

Jan 13, 2013 | Cobra 29 LTD CB Radio

1 Answer

Radio quits after 15-30 seconds


without more detailed info, quick suggestion - thermal fault, if all TX audio works when in this fault condition, it may be fair to assume audio IC is ok and check electrolytic capacitors and dry joints.

Nov 28, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I have a cobra 148gtl with 5 pin side plug for mic.Im trying to wire a superstar dm 1000 echo mic to it,red,yellow,blue,white,& unsheilded wires dont know were they go.???????


ALLways start with ground. Find ground on radio pin with ohm meter. EVERY thing operates off ground. Once you find ground on radio....solder your ground wire on mike cord to corresponding # on mike jack. Once you have ground on proper pin then all else is elementary......use ohm meter to see which wires are TX and RX on mike.....last wire is audio wire.

Jan 20, 2010 | Cobra Radio Communications

1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

No squelch


Yep that should happen.
Green or no color in receive mode
Red when you key the mic to let you know when you are transmiting

Feb 28, 2009 | Cobra 29 LTD CB Radio

2 Answers

148GTL Cobra (no tx)


Bad transmitter. You can:
1) take it to a repair shop
2) get a new radio
3) repair the transmitter with a stock replacement transmitter
4) check the inside of the radio, make sure everything is where it's supposed to be
5) make sure that you are using the correct power supply for the unit

If the problem is too extensive and you consider getting a new radio similar to the 148GTL, try the Galaxy DX 2527. It's a BIG radio. But it's production was discontinued. If you can't find a Galaxy DX 2527, try a Galaxy DX 2517, it's similar to the DX 2527, but with less features, but has great sound, I get nothing but good comments when I talk on it. The DX 2527 has an okay transmitter, it doesn't sound all too good by itself, so that's why you have the echo and robot voice changer options.

Hope this helps!

Oct 12, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

No recieve on virgin cobra 142 gtl,


seems to me that the audio ic of the cobra 148gtl brokedue sudden change of voltage from power suplly or flactuation. ta7222p

Jun 07, 2008 | Radio Communications

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