20 Most Recent Cobra LI3900-2DXVP (14 Channels) 2-Way Radio Questions & Answers

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Stuck on rx mode

Rx is an abbreviation for receive. (Tx is transmit) There are a variety of reasons a radio will be "stuck" in Rx: 1) Another radio in the group is stuck in transmit and you cannot reply if your radio is receiving the other radios transmission. 2) Your radio is programmed for Rx only. 3) Your radio has a Tx problem such as a bad mic, or something covering the mic opening. 4) Your battery is low or bad. It takes more energy to Tx than to Rx. Best regards.
2/11/2014 6:28:00 PM • Cobra... • Answered on Feb 11, 2014
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One of the radios is

Be the first to answer 5/15/2011 12:27:11 AM • Cobra... • Posted on May 15, 2011Be the first to answer
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I have a Cobra classic 29zLtd.. When you key the mic needle moves a little to the right. When ur close to someone they can hear you when a few links apart they can't .

A manual link is at the bottom of this entry. Troubleshoot the problems you've described: Meter Not Working: The needle moving slightly to the right when you key the mic could be due to incorrect calibration. Make sure to recalibrate the meter according to the manual instructions. If you calibrated it differently, that might cause the needle to go against the right side of the meter. Recalibrating the meter should resolve this issue. Meter Light Problems: If the meter light isn't working, consider replacing the LED. Sometimes, a burnt signal meter light can occur. Replacing the LED should fix this. SWR Meter Not Working: Incorrect SWR calibration or bumping the calibrated knob might cause the SWR meter to malfunction. To check the SWR meter: Turn on the SWR calibrate knob until it keys up all the way at the end. Switch to SWR mode and key the mic. If the needle barely moves, turn down the Dynamike knob. Finally, switch back to S/RF mode. No Receiving Audio: If you're not receiving audio, check the following: Ensure the squelch knob is adjusted correctly. Start with the knob counterclockwise and turn it slowly clockwise until white noise stops. Verify that the microphone is working properly. You can try a different mic to rule out any mic-related issues. Make sure the radio is on the correct channel for transmitting and receiving. ========================================== Calibrating the SWR (Standing Wave Ratio) meter on your Cobra Classic 29zLtd CB radio is essential for optimal antenna performance. Follow these steps to calibrate it properly: Prepare the Setup: Park your vehicle at least 20 feet away from trees and buildings. Close all doors, hood, and trunk. Choose the Channel: Select the channel you want to check. It's recommended to test on channels 1, 20, and 40. SWR Calibration: On the radio, press the SWR/CAL button until the display shows "CAL." While pressing the transmit button on the microphone, turn the SWR CAL knob (the last knob on the right) until the meter needle aligns with the "CAL" mark. Release the transmit button. Switch to SWR Mode: Push the SWR/CAL button again until the display shows "SWR." Read the SWR: Press the transmit button on the microphone. Observe the SWR reading on the top scale of the meter. Ideally, the SWR should be below 3. Lower values are better. Remember that SWR is a measure of antenna performance, and poor SWR can be caused by the antenna, antenna cable, or installation. Adjust the antenna length to achieve similar SWR readings on channels 1 and 40 while keeping it below 3. Most antennas are adjustable; refer to the manufacturer's instructions for specific adjustments. cobra-29ltdclassic-cb-radio-user-manual.pdf (roadtrucker.com) MANUAL
4/18/2024 7:37:10 PM • Cobra Radio... • Answered on Apr 18, 2024
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Cobra RX385 Two-Way Radio. Why does my walkie-talkie send messages but can't receive any sound.

Question edited for clarity and translated into 'Adult'. Question moved from Cellphone category. https://www.google.com/search?q=cobra+rx385+no+audio https://www.google.com/search?q=Cobra+rx385 ..
1/1/2024 9:42:37 PM • Cobra Radio... • Answered on Jan 01, 2024
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I have a Cobra 148 GTL side mike jack.

There appears to be help here and that forum is the best place to ask. It is a Post Factory modification according to this.

WTB cobra 148 gtl side mic

WorldwideDX Radio Forum https://www.worldwidedx.com > threads > wtb-cobra-... Feb 27, 2019 - 148 GTL side-mic uses 5 pin mic receptacle. If the radio in question is a side mic and has a 4-pin receptacle, then it was put in post-factory ... Cobra 148 GTL Malaysia.. side mic?? Should I buy? Aug 13, 2018 148gtl blown d44 and mic Jack conversion - WorldwideDX Mar 1, 2018 Old school Cobra 148GTL.... ' WorldwideDX Radio Forum May 13, 2019 Cobra 148gtl Basket case! ' WorldwideDX Radio Forum May 7, 2018 More results from www.worldwidedx.com https://www.google.com/search?q=Cobra+148+GTL+side+mike+jack ..
12/3/2023 5:48:29 PM • Cobra Radio... • Answered on Dec 03, 2023
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6 wires d-104 white shield blue black red & yellow what color goes to what number 5 pin cobra mobile 148 gtl

Here are the instructions:
  • PIN #1 ~ WHITE
  • PIN #2 ~ SHIELD
  • PIN #3 ~ BLACK
  • PIN #4 ~ BLUE
  • PIN #5 ~ RED YELLOW N/C
I hope this helps!
10/29/2023 6:57:32 AM • Cobra Radio... • Answered on Oct 29, 2023
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I have a Cobra Microtalk walkie talkie, one sends & receives, the other just receives it won't transmit just makes loud noise. What is happening?

8/16/2023 11:51:42 AM • Cobra Radio... • Answered on Aug 16, 2023
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Mods for Cobra 29LX max ?

Manuals in the link tell you how to tune. What kind of 'modifications'? https://www.google.com/search?q=Cobra+29+LX+max+manual ..
8/15/2023 5:37:15 AM • Cobra Radio... • Answered on Aug 15, 2023
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How to wire a Sadelta M3 to a Cobra 29 LTD Classic

I believe to wire a Sadelta M3 microphone to a Cobra 29 LTD Classic CB radio: The Sadelta M3 microphone has four wires: white, shield (bare wire), red, and black. The Cobra 29 LTD Classic CB radio's microphone jack also has four pins: Pin 1 (Audio), Pin 2 (Ground), Pin 3 (Transmit), and Pin 4 (Receive). To wire the Sadelta M3 to the Cobra 29 LTD Classic, you need to connect each wire from the microphone to its corresponding pin on the microphone jack. The white wire carries the audio signal from the microphone's element to the radio, the shield wire provides a ground connection, the red wire activates the radio's transmit function when the microphone is keyed, and the black wire is used for receive audio. Here are the specific steps to follow:
  1. Cut off the existing microphone plug on the Sadelta M3 microphone cord.
  2. Strip about 1/4 inch of insulation from each of the four wires in the Sadelta M3 microphone cord.
  3. Connect the wires to the pins on the microphone jack as follows:
  • White wire to Pin 1 (Audio)
  • Shield (bare wire) to Pin 2 (Ground)
  • Red wire to Pin 3 (Transmit)
  • Black wire to Pin 4 (Receive)
  1. Solder each wire to its corresponding pin on the microphone jack. You may want to use a multimeter to verify that each connection is solid and that there are no shorts or open circuits.
  2. Once you have soldered all the wires, test the microphone by speaking into it and checking that the radio's TX meter moves as you speak. Also, check that you can hear audio through the radio's speaker when receiving signals.
  3. If the microphone is working correctly, use heat shrink tubing or electrical tape to cover the soldered connections and provide strain relief for the wires.
Note that some microphones, including the Sadelta M3, may have additional features such as a built-in amplifier or power supply that require additional wiring.
2/26/2023 11:41:56 PM • Cobra Radio... • Answered on Feb 26, 2023
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Cobra 29 NW LTD Classic won't transmit and no sound but will receive

The power output transistor has probably failed; usual cause is poor connection, excessive SWR or widely out of specification aerial.
2/8/2023 5:55:10 PM • Cobra Radio... • Answered on Feb 08, 2023
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Where do you find make and model?

La radio Cobra XLR CB es un modelo m?s antiguo, por lo que es posible que no tenga un n?mero de serie. Para averiguar el a?o de producci?n, puede buscar el n?mero de modelo en el sitio web de Cobra o ponerse en contacto con su departamento de servicio al cliente para obtener m?s informaci?n. Adem?s, si planea vender la radio, es posible que desee consultar con una tienda local de electr?nica o radio CB para obtener una estimaci?n de su valor.
1/6/2023 3:08:53 AM • Cobra Radio... • Answered on Jan 06, 2023
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Peak and tune a cb radio

If you don't have the proper equipment to do the job right then don't do it.
12/1/2022 5:53:14 AM • Cobra Radio... • Answered on Dec 01, 2022
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I have a cobra 29lx my back light isn't working and buzzing from speaker

Hi, please update your power source and move your device away from anything that deals with using frequencies like other radios, microwaves, active walkie talkies or antennas. Being close to these things could cause interference with your device leading to the buzzing that you're hearing. Thank you
11/9/2022 12:26:28 AM • Cobra Radio... • Answered on Nov 09, 2022
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I have a cobra 29 LX BT. It turns on but I can't get any of the buttons to work. The dials seem to work but I'm not sure since I don't know much about cb radios. Any help is appreciated.

Hi, Please double check that your device has new batters or is charged up properly. Then, you would need to have a means of testing the device through instructions from a third party like a radio station/center or other organizations that broadcast to devices like your own. To further learn how to use your device, you can peruse it's manual. Thank you.
10/7/2022 7:12:20 PM • Cobra Radio... • Answered on Oct 07, 2022
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I have a 5 pin midland mic and I want to wire to a cobra 2000 gtl

Hi, please start by using the midland mic user manual to understand to how to wire it to your radio device. You can call midland to ask them for the manual if you don't currently have it, and they should be able to email you a copy. Thank you.
10/5/2022 12:16:45 AM • Cobra Radio... • Answered on Oct 05, 2022
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I need to know what type of antenna should I use for a 1993 model cobra 29 LTD Classic . Both mobile and base?

There are a lot of antennas on the market, you need to be wary or some of the cheaper ones because the corrode quickly. Antennas are a very important part of any radio setup and they can make or break your signal. I use this company and I highly recommend them: Sirio Antenne - HOME
8/11/2022 1:16:53 AM • Cobra Radio... • Answered on Aug 11, 2022
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