Question about Cobra 148 GTL 120-Channels Base CB Radio

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148GTL Cobra (no tx)

When I key down the mike for tx, the red tx lite goes on, the needle pegs for three seconds, then ttheir is a loud hum, then goes back to rx?

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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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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!

Posted on Oct 13, 2008

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2 Answers

Need Cobra 148GTL with Cobra HG M75 pin-out color code


1audio. 1red
2shield. 2shield
3receive. 3blue
4switching. 4white
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Hope this helps

Jul 03, 2012 | Cobra 148 GTL 120-Channels Base 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 148 mounted on the hump in a pickup truck and it works fine. Then I plugged in a old Turner +3 desk microphone and I get bad feedback when it is keyed up and I can also hear my voice thru...


You're most likely getting lots of RF feedback from the metal cab of your truck,combined with the real sensitive nature of the amplified Turner mike.I would put an old original Cobra (coffin mike) handheld mike or a Astatic Roadking 56 (RK56) on it.They are really hard to beat,especially when you have lots of feedback & squealing. I also have a 148GTL (malaysia made) that has a Turner +3 deskmike & it squeals in my truck but not in the house. The 148GTL has given me better service than ANY other radio I've owned.It has 120 channels (freeband) & upper & lower sideband. I think mine is a 5pin Cobra-type plug-in. Try a simpler mike & good luck. Squirrly

Mar 13, 2011 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

I have a Older 148GTL, when I key down the mike for tx on AM, the red tx lite goes on and the needle pegs, No Modulation is heard on friends radios, appears to work normal on SSB


Hi, my name is John. Welcome to Fixya. Try turning your MIC GAIN to MAX and see what happens. Let me know how it goes, may have further. Thanks for choosing Fixya.....John

Oct 26, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

My radio recieves ok but only whistles when i key the mike is this a major fix?


Do you have talkback installed? It my be too loud and causing feed back. Back the mic gain down if so.

Could also be improper mic wiring. If you use a mic that is wired for a different radio, it could just cause a hum, buzz or squeal.

Another thing that can cause a hum, buzz or squeal is a faulty volume and or squelch knob depending on the radio.

  • Turn down or disable talk back.
  • If you cannot turn off or disable talk back, lower mic gain.
  • Try a different mic that you know is wired for cobra.
  • Play with volume and squelch knobs while TX and see if it stops at all. If it does replace knob.

Oct 12, 2010 | Cobra 150 GTL DX 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 29 NW ST LE. When I key the mike, the needle in the gauge does not move, but the light is on. I don't know if I am heard or not. The RX/TX indicator does change to red though. Could that be...


Check all of the switchs on the radio,
if all are were they belong then the meter is
bad,but you need to try to find someone to
give you a radio check onair.
Maybe this helped.

Aug 23, 2009 | Cobra Radio Communications

2 Answers

Superstar 3900 with no USB or LSB on receive.


most likely been fiddled with and out of alignment. If you have a freq counter and a volt meter you could possibly fix it yourself. look at cbtricks.com for the aligment procedure.

Jun 13, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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