Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 148 GTL ST. No AM transmit audio. Carrier is pinning meter. Works fine on SSB.

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wcrave

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Could be TR41 or TR42. I would try TR41 first.

Posted on Jun 29, 2011

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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.

Jul 28, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

No transmit on 148gtl


First is check to see if SSB transmits or not==if it does the AM regulator on side wall of radio is bad.

Second with a meter and no power on--test the driver and final for shorts or open.

If one is bad replace both.

let me know what you find.

Apr 29, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

148 gtl receive issues


The problem is in the audio output chip usually bolted to the inner chassis. Sometimes the chip developes a hairline crack, replacement recommended.

Mar 14, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

I need a wiring diagram for a roadking 56 to a cobra 148 can u help me


Pin #1-audio-white,2-shield,3-black,4-Sw com,5-transmit-red .....hope this helps..

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

2 Answers

Cobra 148fgtl low power on am/ssb no swing all finals ok


try adjusting the L36,L38 to the highest reading on the external meter and then adjust VR10 TO 4 watts. If this doesn't cure the problem, you have a weak final transistor. Good Luck

Feb 06, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 148 gtl b no recieve


make sure that the rf gain is turned up all the way.Check diodes D-12&D-13.

Jan 08, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

My ranger 2950 will receive but will not transmit, also where can i get a 6 pin mike for this same radio ?


check tr 51 (Q 51) the sb754 on the back side mounting of the radio.. the center pin (collector) of this modulator ic should not be 13 volts. my bet is that it is.. this test is done in am mode.. not sideband.
depending on you carrier setiing it should be between 3 -8 volts any higher in am mode and my bet is that its bad... much more common than the finals in this radio. good luck Rick

Dec 13, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers

No AM carrier or modulation. SSB transmits good


what cb is it ? it sounds like your am section is not getting powered up when you switch from ssb to am. If i know the model i may have a diagram of it here and suggest a place to start

May 02, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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