Question about Motorola EM1000R Two Way Radio

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Motorola gm300 my motorola gm300 can send but rcieve very soft.

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  • wp4k May 11, 2010

    Hope you had solved your problem, i just wanted to add a bit of info...



    I had used/repair/installed/modify quite a bit of motorolas( HAM Operator for 25yrs) and that gm 300 was one of the trickiest... I used them for both mobile service as well as Repeaters( 2-units thru controllers)...



    They are very solid and stick to the programmed frequency, so here are my .2cents, go back to your programming and verify you are ok there, band-segments/tone/dcs usage/squelch level and the antenna system...



    good luck...



    kilo

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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.

Posted on Dec 08, 2007

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