Question about Motorola MU21CV (1 Channel) 2-Way Radio

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Motorola GM300 Question

Hello - I have GM300 and about 2 seconds after I turn it on it starts to squelch and the transmit light is on... radio transmits over it but I don't know how to get it to stop?? Any ideas? Thanks

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  • Jason Aug 24, 2008




    Thanks eradiostore...I know it still does it with the mic off but I'll check he antenna connection in the morning


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I HAVE GM300 AT MY SIGHT AND THE OUT PUT IS VERY WEEK THE SPEAKER IN THE UNIT IS OK THE SIGNALES ARE VERY WEEK PLEAS SUGGEST THE SOLUTION ON MY E MAIL JNV.CORPORATION@GMAIL.COM OR JNV.CORPORATION@HOTMAIL.COM SUDESH

Posted on Sep 18, 2008

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Make sure that the accessory pins on the back of the radio are not shorted to each other. To learn more about the accessory pins on the GM300 go to www.batlabs.com .

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Posted on Sep 05, 2008

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Check your antenna connections and coax for loose connections or damage. Also check your hand mic. See if the problem disappears if you turn on the radio without the mic attached. The two most common problems with a mobile radio are antenna and mic problems.

If you feel these are in order, it would be wise to have a tech look at the radio.

Posted on Aug 24, 2008

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Tx motorola gm300


You have transmit and voice out good..Finals are good and preamps on 27 mhz. Recieve could be speaker. Change External speaker with a Radio Shack plug in External 4 inch speaker with male jack. Turn volume up halfway. Turn off squelch counterclockwise to hissing noise. Turn off Noiseblank NB switch to off. Turn off Dynasquelch switch(options on new models) Turn Off ANL to off or on back and forth till truckers or friend is heard the loudest. If still cannot hear could be capacitor, transistor or the worst thing ever 32 pin IC chips(OH NO! throw in garbage unless you have a Cb repair shop-Radio Shack repairs their own(REALISTIC BRANDS RADIO SHACK. INC) LET CB SHOP HAVE A LOOK SEE OR A REPAIR MAN OF ELECTRONICS RADIO OR TV GUY. SOME JUST WORK TV'S BUT RADIO IS WHAT YOU NEED.16 or 32 PIN IC'S ARE VERY MICRO AND WON'T HANDLE HEAT OR STATIC CHARGE OF CARPET
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Hi,

If you are referring to the receive audio, possibly the reason it is soft/weak are:
1. defective internal speaker - try using an external speaker;
2. volume control - try rotating back & forth till you get satisfactory level. In some cases, you may need to clean the inside of the volume control with an electronic contact cleaner. At worst is that it has to be replaced;
3. defective amplifier - between the volume control and the speaker is the audio amplifier. This is a single op-amp IC U501 (TDA1519A); and/or
4. muting - which is a bit complicated. This is triggered either by the squelch or by the CTCSS tone decoder. You may have partial/false muting. You need to check Q501 (MMBT3904) and its associated circuitry.

Other than #1, most fix would require opening the unit and familiarity with electronic circuitry & components, use of a DVM and soldering iron. Perhaps your best bet would be to seek the services of a qualified communication technician.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

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