Question about Motorola Talkabout T5800 (22 Channels) 2-Way Radio

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Transmission problem One of my T5800 units will not transmit anything but the the "music note" when I push that button (the button above the "-" on the face of the unit). Otherwise, when I push the PTT, the microphone doesn't engage, nor the the indicator light go from blinking to constant red. It doesn't appear the PTT switch can be replaced easily. Suggestions?

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Hi,

A couple of things you can try:
1. Use electronic contact cleaner (spray type) on the PTT switch;
2. Use an external speaker/microphone and/or handsfree VOX headset
3. Replace the PTT switch. 4 solder points. Might not be easy but doable.

The last would require that you remove the defective PTT switch and use that as per sample when looking for replacement. Some printers uses the same type of switch. Familiarity with electronic components/circuitry, use of a DVM and a soldering iron would also be required.

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

Good luck and kind regards.

Posted on Jan 10, 2008

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Posted on Jan 02, 2017

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Several things can cause poor reception. I have a few questions for you.

1. Have you tried measuring your SWR (standing wave ratio)? This helps give you an idea how well your transmission line and antenna are working.
2. Is this radio being used as a base or mobile? Do you have proper grounding on the antenna?
3. Pressing the mic button and seeing the radio indicate "transmit" does not always mean you are transmitting at full rated power. Have you tried transmitting through a wattmetter into a dummy load?
4. If the transmission line is good and the antenna is good, then I would suspect that something may be wrond with the receiver's front-end (sensitivity).

Receiver sensitivity can be checked by using a RF signal generator. Unfortunately you'll have to take the unit to a repair shop to have that checked. Try the other things I mentioned above. Let me know what you find and we'll go from there.

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