Question about Uniden GRANTLT 40-Channels Base CB Radio

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When i key up the mic it interfers with my radio speakers

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No fault of the Grant, just that the radio is demodulating the powerful RF of the Grant. It just happens no real cure, nature of the "beast". Only thing I can suggest is to move the radio away from the CB station or lower the mic gain or simply turn it off.

Posted on Feb 13, 2010

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Why is humming coming from speaker when mic is keyed?


this is strange as most times if a proper transmit key is depressed , then the radio switches from receive to transmit , the mfg know this would cause some great squeal from receiver /transmitting so close to a receiver so the part that is the receiver is muted to keep this from happening , id say there is some fault in the part that does this muting of receiver

Apr 13, 2016 | Radio Communications

1 Answer

Galaxy dx 44hp, no am audio or mod ,fm & pa ok


Have you tried another mic. First guess microphone wire broke or broke solder for audio wire in mic jack at mic cord.

Mar 26, 2014 | Galaxy Radios DX-44HP Mobile Amateur Radio

1 Answer

Cb works but there is no sound


turn volume and mic gain half way up, plug in an external speaker into the PA jack, flip PA switch and key up, if it doesnt squeal your audio final is blown or it could be so simple as mic wired wrong or broken wire. try another mic.

Mar 31, 2013 | Cobra 29 LTD CB Radio

1 Answer

Motorola two way radio rdu4100 which remote speaker microphone fits this radio?


PMMN4013 Construction Grade Remote Speaker Mic OR
PMMN4029 IP57 Rated Construction Grade Remote Speaker Mic.

Best regards.

Sep 27, 2012 | Motorola RDU4100 Two Way Radio

1 Answer

I have a cobra 29 nw st ,when i key the mic i get tremendous feedback , i have the mic control almost off but then cant be heard.....any suggestions?


There are 2 possible problems.
  1. Feedback where the mic is to sensitive or talkback is to loud and radio is producing a Loop trying to rebroadcast what it is producing.
  2. A ground loop usually refers to a current, generally unwanted, in a conductor connecting two points that are supposed to be at the same potential, often common ground. Power leads,coax and speaker wires clumped together.

When there is a third you are running a power mic on a overmodulated radio. You might have a bad speaker sorry i dont have the science behind it just realworld experience. I have a General Lee that eats them. We may be digging in the wrong place i would try another mic. goodluck

Jul 18, 2011 | Cobra 29 LTD CB Radio

1 Answer

29 nw LTD no audio on receive out the speaker in the radio or through the ext speaker and on transmit no audio.Radio shows a 4 watt dead key


If you take your external speaker and plug it into your PA jack in the back and key up your mic do you hear anything. If so then its not your IC chip if not its your IC chip and it will need to be replaced.

May 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

Radio squeal.


Check it with the external speaker unpluged, turn the mike gain down a little at a time, until it does not squeel. ..hope this helps..

Mar 20, 2010 | Galaxy Radios DX-44V 40-Channels Base CB...

1 Answer

I have no sound, even when I key mic. The meter goes up one time and not the next.


This could one or more of the following problems. I'll start with the ones I feel are most likely the cause, but you can check them in which ever order you like.

When the mic is keyed, you should not hear anything from the reciever. The mic's PTT (push to talk) button switches the transciever from recieve mode to transmit mode, if it didn't all you would hear and transmit would be screaching feedback. Also, during the transmit mode, the radio's meter should switch from indicating relative signal strength (or "S" units) to power out where 4 watts AM should indicate full scale deflection of the meter.

This makes me believe that you've got a intermittent connection in the mic circuit. This can be anywhere from inside the mic, mic cord, mic connector and inside the radio - from the mic jack. The cord is supect as it is always being twisted, pulled, stretched and strained under extremes of temperatures and humidity.

You can check the cord by simply replacing it or with a dummy load connected to the antenna, see if keying the mic and shaking the cable makes the power meter jump or bounce. Twist and pull the cord over its entire length - but pay particular attention to the strain relief points near the mic body and connector as these are typical points of failure.

Check contacts inside the mic, between the mic cord and plug, mic plug and mic jack on the radio to be sure there is no oxidation or broken / shorted wires.

There may also be a problem with a blow speaker, which would explain the lack of audio on the reciever. Connect an external speaker to the external speaker jack (if provided) or open the radio to connect a speaker to the one under test.

Least likely - but still possible is a fault with the antenna coax cable, antenna and / or mount. Look for split, crushed, or otherwise damaged cable along the entire length. Pay attention to pinch points, etc. Repair or replace as needed. Look for oxidation build up between the antenna and mounting threads - clean as best you can or replace. Check the coil (if any) on the antenna. Broken, burnt, etc.insulators over coils are indicators of a problems. Again, repair or replace as needed.

I hope this helps you identify the source of the problem - good luck!

Oct 30, 2009 | Midland 1001Z 40-Channels Base CB Radio

1 Answer

Mic hum


Yes, the wiring is different. Reverse the wires on pins 1 & 2, then reverse the wires on pins 3 & 4.

The wiring for you radio's mike is:

1- Audio
2-Ground (Shield)
3-Receive
4-Transmit

Depending on the vintage of your mike, the colors Uniden uses for these functions are white or yellow for audio, red is transmit & black is receive.

Jul 31, 2008 | Superstar SS-121 120-Channels Base CB...

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