Question about CB Radios

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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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  • Contributor
  • 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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1 Answer

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.

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My cb radio is on but cant hear nothing sound is turn up but nothing come out


You didn't include the make / model CB you have, so I can only offer general suggestions. If these do not work, please provided the missing info.

Start out by locating and setting the the Volume to a position between 1/4 and 1/2 way clockwise, the Squelch to fully counter-clockwise and the "RF Gain" to fully clockwise to "MAX".

Check the position of the "PA / CB" switch and set to CB. When set to PA, both receive and transmit audio is sent directly to an outdoor speaker (instead of through the transmitter and antenna for reception by other radios). The PA speaker is usually connected to a jack at the rear of the radio. When the PA / CB switch is selected, the internal speaker is silenced even if there is no PA speaker connected.

At this point, you should hear static or voices (with an antenna connected). Do not attempt to transmit without a properly tuned antenna connected. If no sound is heard, there's something else wrong.

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Mic may have audio wire broken in cord at mic plug wire solder connection.
Stock
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notice the numbers on the black plug after you pull it out of the radio.

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If the receive works ok,sounds like a mic
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Cobra 29 LTD Classic not transmitting or receiving


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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).

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1 Answer

I can recieve but i cannot transmit


sounds like you might have a bad voltage regulator

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