Question about Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 142 GTL feeback audio

Feeback audio

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  • Cobra Master
  • 1,795 Answers

Put on a different mic and see if it still happens.I am going to attempt to draw an insert so if it works follow it if it doesn't I'll explain it.
this wire is the audio on the inside of mic
-------------------------------X-------(4700ohm 1/4 w res) ----X---------
.001 .001
this wire is the shield
-------------------------------X-------------------------------------X----------
at the point marked with X take two .001 capasitors and wire them from one wire to the other. this should make your squeal go away.

Posted on Aug 23, 2014

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Posted on Jan 02, 2017

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SOURCE: cobra 148 gtl

First take a jumper wire and connect it to the DC Ground of the input of the radio then touch it to the TX pin on the radio if it does keyes up then its in the mic or mic cord on the end of the mic plug or where it goes into the mic cable goes up inside the mic. If the radio don't key up at all then check the main voltage regulator chip one pin will have 8 volts transmit and another pin will have 8volts recieve. If you get no switching DC voltage on the regulator then its bad and needs replacing there is also a known bad capacitor in the radio thats only 10 volts change it to 25 volts at the same capacitance.

Posted on Jan 08, 2008

audio20
  • 22 Answers

SOURCE: cobra 148 gtl dx manual

This is the Manual for the C148GTL

Posted on Apr 23, 2009

  • 773 Answers

SOURCE: Cobra 1000 GTL by Dynascan

This is a complicated modification. I have never done it to a 1000 GTL, but its done basically the same in all radio's.

I don't recommend doing it, especially since I am not 100% sure on how exactly to do it. I have never been in a 1000 gtl. If I had one in front of me I could tell you for sure how to do it.

If the reason for Variable power is a linear, just a swing kit in for the dead key you need, most likely 2 watts, and leave it.

Here is how to do a variable power mod. this is assuming the swing mod is done the same to this as a cobra 25/29 or uniden 68/76 etc.

If you would like to try it, here it is.

You get a TIP31 transistor, Radioshack has them.

Where you put the swing mod in the radio, which is a cap and a resistor, you put the TIP31 and cap. A 47uf cap works fine.

With the resistor facing you, and the tab in the back away, solder the cap to the transistor. the leg with the black stripe goes on the right most leg. then the other goes to the center leg of the transistor.

Solder a wire on the left most leg, long enough to reach the front of the radio. Now solder the 2 legs that don't have the wire on it, in the place where you would put the swing kit, with the black stripe on the cap facing the back of the radio usually.

Remove the wires from the RF gain and solder them together.

Now solder the wire from the transistor to the center tab.

Remove VR6 and solder a wire from the top tag of the RF gain to the top connection of VR6 that you removed.

Then connect a wire from the bottom tag to a ground point. The side of a tuning can works fine.

Take a piece of shrink tube and put it over the TIP31 so it does not ground against the heat sink, that would be bad.

This is done basically the same in all cb radio's.


Posted on May 03, 2009

Benimur
  • 6966 Answers

SOURCE: cobra 142 gtl no audio on receive

Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

7008f3b.jpg

Good luck and thank you for asking FixYa.

Posted on Dec 20, 2009

  • 19 Answers

SOURCE: Cobra 148 GTL ST. No AM transmit audio. Carrier is

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

Posted on Jun 29, 2011

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1 Answer

I have cobra ca61 desk mic i need it wired to my cobra 142 gtl home base. the base has 5 pins so i need my mic to be wired for 5 pin... any ideas?


cobra 5 pin to 4 pin adapter on ebay around $5.00
http://www.ebay.com/itm/WORKMAN-C4P5C-CB-RADIO-MICROPHONE-ADAPTER-5-Pin-COBRA-TO-4-Pin-COBRA-/121655850211?hash=item1c5340f4e3:g:e0AAAOxy2YtRsJ8n

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pin#1 audio lead #2 audio shield #3 receive control #4 ground #5 transmit control

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I need to wire a silver salute mic to a cobra 142 gtl 5 pin what color wire goes towhat mic pin


dont go by colors.. go by what wires are on the switch and mic element.. mics can be rewired and no one told you the colors could have changed FYI..

Pin #1 ~ Audio
Pin #2 ~ Shield
Pin #3 ~ Receive
Pin #4 ~ Switch Wire
Pin #5 ~ Transmit

always go by connections not color of the wire. that way you learn and you can do any mic. to any radio.

Nov 30, 2013 | Radio Communications

2 Answers

Cobra 142 no audio


Check to make sure the ext speaker jack is not worn out. Even the internal speaker will not work if it is worn.

Jul 26, 2012 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Problems with Cobra 142 GTL


the diode and missing resisters are and caps are probably the culprits.

Feb 01, 2012 | Cobra Radio Communications

1 Answer

Radio is a cobra 142 gtl s/b turned on switch and no power, check fuse is ok.


Hi, my name is John. Welcome to FixYa. Make sure that you are getting power to your unit by running the wire to the battery, hot (+) and ground (-), let me know if you still have no power and I will post solution here. Thanks for choosing FixYa....John

Nov 15, 2010 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 142 gtl no audio on receive work on pa, an on ext spkr get talk back,,,,but there no talk back in radio.... no audio on int spkr. tx good...


Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

7008f3b.jpg

Good luck and thank you for asking FixYa.

Dec 18, 2009 | Cobra Radio Communications

1 Answer

Low dead key on my radio


If it is a 142 GTL your A.M. power is VR6 . Good luck and be carefull and DON'T get carried away remember AT YOUR OWN RISK NO LIFE GAURD ON DUTY!!!! You should'nt have any problems though......Dan

Apr 01, 2009 | 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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