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CB Radio will receive but not transmit

I have been able to hear the result of transmitting on another receiver but voice tranmission does not occur. I soldered in another electret microphone but this did not help.

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  • kxb23 Mar 23, 2009

    my cb unit is new, from wally world :( but i cant transmit only receive, i have a non ground fiberglass wip antenna and a 2x3ft ground plate.
    Whats wrong?

  • AnyMHz.com
    AnyMHz.com May 11, 2010

    what is the radio model number. does the pa work? can you see key on another radio

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  • 55 Answers

Sound Like The Modulation Amp May Be Dead..
Or a Componet in The Mod. Section....You Can Pick up The Repair Manual..@ www.samswebsite.com For about $20.00...Good Luck

Posted on Feb 21, 2009

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Problem no squelch noise or speaker like its muted, but can hear weather ok shows receiving and ant ok


Since the radio cannot transmit on Weather bands, there is no need for the radio to detect if it is transmitting when receiving weather.
In CB mode (on CB channels) the radio will mute when transmitting. So... a guess is that it is muting, or transmitting all the time in CB mode. Check for a mic problem by removing the Mic from the radio ... if it receives CB with no mic connected, then there is an issue with the mic. Otherwise, unless the unit is in PA mode (public address mode) it is likely something internal and beyond the scope of this service.

Sep 08, 2015 | Cobra 29lx Cb Radio W/clock 29 Lx Lcd

Tip

Problems in CB Radio Receive and Modulation


Much of the time complaints about CB receive (RX) and modulation are caused by problems in the antenna system. Make sure there are no shorted or open connections in the coaxial cable or PL-259 (screw-on connectors for coaxial cable, located at the antenna and rear of CB radio) connectors. Use your radio's meter or better still, a Power/SWR meter to check the SWR (Standing Wave Ratio) of the antenna. Try to get that as close as possible to a 1:1 ratio on the meter. A shorted or open antenna can keep the receive audio on your radio at very low levels. Plus, this will harm your transmitter if you continue keying the mike.

Another problem can surface in the radio itself. This will be noticed if you can transmit, but have no "modulation". Modulation can be described as the voice heard above the "carrier" (your transmitted signal). Every CBer knows about the term, modulation. The Truckers will definitely inform you about your modulation quality...lol. This problem can be caused by a defective AMC (Automatic Modulation Control) stage in the receiver circuit. Also, there will be no modulation upon transmit.

One other thing could be causing this lack of receive audio. Defective wiring or switching in the microphone can result in no audio. Additionally, in many radios, a missing mike will not allow receive, because the microphone connection completes the RX (Receive) circuit.

Solutions:
1. Check the antenna system, and fix any problems.
2. Check mike, or substitute another one.
3. Using meter, and/or another radio for listening on same channel, check power and receive.
4. You can probably fix 1, 2 and 3 yourself, or with the aid of a friend.
5. AMC problem in radio (as described above) will require professional service from a CB (Citizens Band) repair facility.

The above suggestions and advice will assist in repairing the majority of the symptoms described.

Regards, Bill

on Sep 18, 2010 | Car Audio & Video

1 Answer

Radio will not send


It is possible your Code for transmit is different than your Code for receive. Cobra makes so many models, you are not giving enough information. Also, Transmit takes a LOT of power, so even if everything is setup, if your batts are weak or old, the radio will receive, but not transmit. Also check your antenna, make sure it is tight and NEVER transmit without an antenna. Yes, all lights will work even with old batteries.

Nov 10, 2013 | Cobra Radio Communications

1 Answer

I am able to transmit but not receive


get another that only receives and no transmit.hook them up together .one on top of the other .I have a friend that did this and it actually worked

May 30, 2012 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

I can hear everyone talk to me but i cant transmit to them,they can hear me key up but no voice to them.i have checked all connections and grounds,still the same.


Mic may have audio wire broken in cord at mic plug wire solder connection.
Stock
1- Shield
2- Audio
3- Transmit
4- Receive

notice the numbers on the black plug after you pull it out of the radio.

Sep 12, 2011 | Cobra 29 LTD CB Radio

1 Answer

WHEN U KEY UP IT WONT TALK


Do you have receive? If so you might have blew the voice chip. If you don't have receive or transmit you most likely blew those final transistors.

Mar 21, 2011 | Ranger Communications RCI-6900F-25 CB...

1 Answer

Cobra 29 LTD Classic not transmitting or receiving


ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

Dec 20, 2008 | Cobra 29 LTD CB Radio

1 Answer

Transmits but doesnt receive


If the meter shows that it's receiving something, the microphone may be the problem. Another possibility is the speaker & plugging an external speaker in would confirm this. Aslo make sure the squelch control is turned all the way to the left (counter-clockwise) & the RF gain is turned to the right (clockwise).

Jul 18, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

I can recieve but i cannot transmit


sounds like you might have a bad voltage regulator

Apr 03, 2008 | Uniden Bearcat Pro PC68LTW 40-Channels...

1 Answer

Staying keyed up after button release


I have never seen this problem before, check if the VOX is activated, this could cause to transmit the radio, but the voice must be transmited. check if the Accesory connector is not dirty, clogged or damaged

Feb 08, 2007 | Motorola Talkabout T5720 (7 Channels)...

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