Question about Cobra Radio Communications

1 Answer

I have a 148 gtl.. when you tx, there is a loud high pitched tone at the receiving end(receiving radio)...and it is garbled...tried switching radios and when I tx the 148, the other radio had the same high tone, garbled rx??

Posted by on

  • Anonymous Mar 20, 2014

    when I'm receiving there is a high pitch noise coming out of the speaker and the noise increases when the rpm increases.


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 773 Answers

How far away are they? It sounds to me like they are in the same room???

If so, you are getting feed back. CB's are not meant to be that close. As well, the also would raise another issue. Are their antenna's hooked up?

CB radio's need a CB antenna or you can damage the radios. The radio energy will not leave the radio and burn up the transmit section of the radio.

the both need an antenna, and the antenna needs to be tuned.

Also, if you are operating them close like that, you can also damage the receive on the radios.

also, when 2 radios are too close, it over loads the receive circuits on the radio ant thats why its garbled.

Posted on Nov 17, 2010

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

148 gtl cobra cb radio and the rx/tx light stay on

This sounds like a problem with the MB3756 Regulator IC. It controls voltage regulation and TX/RX Switching. It is a common failure in these radios. Check voltages with schematic that can be found at
CB Tricks Home Page

Sep 02, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

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

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

2 Answers

I have a 148f gtl with no rx on am only,just noise.tx good and rx on side band fine,also tx on am. thanks ,bocephus

Check xtal X1 (7.3450 MHZ). It's in the am osc. I had exactly the same problem. I live in a highly corrosive coastline area

Apr 11, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

2 Answers



Offhand, pls try:
  • If the high pitch sound (feedback) occurs during the receive, then you need to check the switch inside the microphone and verify that the audio line is not directly connected mic element wire; it should pass through the switch. Alternately, it may be the switch that is shorted. If you are using a power mic, you may have to lower the settings a bit or decrease the gain;
  • If the feedback occurs during transmit, you need to check the TX/RX regulator and switching circuitry. In some cases this would also be true if you are using a linear amp and the grounding is not adequate and/or the SWR relatively high.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 31, 2008 | 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

4 Answers

Cobra 2000 gtl

cobra 2000
am carrier 4.4 volts will not ajust...ssb carrier will 3.5 volt will ajust but max out put is only 3.5 volts.losses all voltage at ssd carrier when switched to usd r lsb

Jul 03, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobrba 148 gtl TX

Thanks sharcnet i just going through the steps in my head trying to figure out what I would do if it was on my bench ..Between the two of us we'll figure it out!!!..... Dean

Feb 01, 2008 | Cobra 148 GTL 120-Channels Base CB Radio

Not finding what you are looking for?
Radio Communications Logo

Related Topics:

83 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cobra Radio Communications Experts

Level 2 Expert

500 Answers


Level 3 Expert

3287 Answers

Brad Brown

Level 3 Expert

15557 Answers

Are you a Cobra Radio Communication Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides