Question about Cobra LI3900-2DXVP (14 Channels) 2-Way Radio

1 Answer

Stuck on rx mode

Radio seems to be stuck on RX mode. Not Sure what RX mean, but that is what displayed on the radio. Receives transmission, but can't send. Please help.... Thanks

Posted by johnnygren7 on

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1 Answer

eradiostore

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  • Cobra Master
  • 1,667 Answers

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.

Posted on Feb 11, 2014

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3 Related Answers

aloha27

Steve

  • 696 Answers

SOURCE: One of my Cobra Microtalk radios is stuck on RX.

Hi!

Almost always, the problem here is that the micro switch for the Push-to-Talk (PTT) button has failed. Your radio should have a warranty, but even if the warranty has run out, it isn't horribly spendy to fix. I'd get in touch with Cobra Electronics, I have heard they're extremely helpful. Try this link and good luck!
https://www.cobra.com/help/

Posted on Jul 06, 2011

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Anonymous

  • 14 Answers

SOURCE: Constant RX mode on cobra microtalk PR3850WX

Sounds like the radio was subjected to electrostatic discharge. If you have your manual, and it describes a way to do a "master reset" on the radio, follow the instructions. This usually involves pushing down on one key while turning the radio on. Otherwise you have to find a licensed dealer for factory service, as there is no way to repair the radio yourself. The use of surface mount technology still confuses many Techs unless they have been to a company's two or three week seminars.

Posted on Jul 24, 2009

cool78259

ruben sanchez

  • 228 Answers

SOURCE: one of my walkie talkie has an RX on the display

depending on what radio you have, they are programmed in different ways, rx means recieve signal

and tx means transmit signal, if you have a mode button, you will have to scroll through it until you

get to the menu that allows you to change the radio transmission. it looks like that radio is only

programmed to receive signals and not transmit. good luck!

Posted on Mar 10, 2011

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GMR1035-2

Hi,

The RX symbol and static noise would only appear if the squelch is down or if you are receiving something from a transmitter.

Receiving something could mean either an intelligent radio transmission from another comparable unit or this could also be spillover signals from adjacent radio transmitters strong enough to override the squelch settings normally called "splatter". At times, electronic devices could cause this effect such as RFI (radio frequency interference) from units such as a personal computer.

It is also possible that your Monitor Mode is "ON", turning it OFF would possibly resolve the issue To turn OFF monitor mode:Press the vol/mon UP or DOWN key. The RX icon will stop blinking and disappears.

In some cases, a component failure would cause this problem. Your GMR1035-2 uses an Automatic Squelch Feature, this would mean the use of a FM Discriminator Chip for Squelch Control. Most manufacturers uses an MC3357P IC chip for this purpose. This of course would require opening the unit, desoldering the suspected component and solder in a replacement. This would further require that you be familiar with electronic components, circuitry, DVM and a low wattage soldering iron. Should you not be comfortable doing this, perhaps your best bet would be to seek the services of a qualified technician.

Hope this be of some help/idea. Post back how things turned up or should you need additional information.

Good luck and kind regards.
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