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Poor Transmission (Garbled)

Having issues with this radi, Its a new install and we tried 1/ moving and replacing the anyenna, 2/ tried another new raio. Always seem to have the same problem. I checked power in on transmit engine off and it styed above 12 volts, however I am still suspect on the power in..... Any thoughts?

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31, hi, is this some sort of a business band radio or a CB radio? Make sure your power wires are large enough to carry the amperage the radio needs. Have you done any kind of SWR check on the antenna system? Make sure the coax does not have a short in it. Make sure you did not splice the power wires with a "scotchlock", those thing do not make a good quality connection. Hope this helps you, and if not reply back here with some more info for me to help you. Thanks Mechanic

Posted on Feb 05, 2008

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1 Answer

Receives fine transmission is very poor


Transmit issues can be related to a bad or poorly charged battery. It takes more energy to transmit than to receive. Try swapping batteries with a known good radio to see if it solves the problem. Clean your battery contacts with a pencil eraser and if needed replace the battery pack.

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I couldn't find mp990 or mp 990 radio anywhere on the web. If you're not going to do your own Google or DuckDuckGo search then you need to supply enough information so someone else can do the search to help you.

There are two basic reasons any radio has poor receiving
1. The receiver design is poor
2. Something has gone wrong.

If you have more than one mp990 and all are poor then the receiver design is poor. If only one is poor then the radio had been damaged.

If these are inexpensive FRS radios then chuck it and buy another. If it is an expensive radio try to find some place to have it repaired.

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From reading through your settings, they appear to be identical. Except, I am not certain what Vox 2 is, or B5 0. If the number 2 beside VOX is a setting, you should set it to off or zero. Otherwise, they appear like they should work. (VOX = voice activation, and when enabled will cause a radio to transmit when it hears a sound, voice, etc.)
If you are using an audio device such as an earpiece or headset, be certain you are plugging it in with the radio turned OFF.
Lack of transmit can also be a sign of a bad battery or bad battery connection. You might try swapping the batteries and see if the problem moves to the other radio.
If these are less than one year old, use the number in your user guide to contact Motorola for a possible warranty replacement.

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4) Bad antenna. Check for breaks in the rubber covering.
5) Other internal problems requiring repair.

Best regards.

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1 Answer

My chatter box will not transmitt more than 1/2 of a mile


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http://www.chatterboxusa.com/images/downloads/manual-X1BT.pdf
Manual above.

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1 Answer

Motorola t5720 one buzzes and you can't hear transmission. It transmits to its partner just fine. It just won't receive transmission form its partner, just a loud buzz


Try trading the batteries between the units and see if the problem moves to the other radio. If so, replace the battery pack. If the problem persists, you have a defect radio, which needs replaced.

Best regards.

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1 Answer

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The first thing which comes to mind is a bad battery pack. You might try switching the batteries between the two units and see if the problem moves to the other unit.

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Third, check the speaker grill and mic holes on both units to see they are clear of debris.

If all these items check out, you may need to eventually replace the defective radio. However, to determine which one is defective by trying them with a known good radio.

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Pls check your power supply it can cause a garbled audio once the power supply is not regulated or constant voltage so your transmission also is defective,check also the connector it should be tighten,if not do change your microphone for temporary......

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1 Answer

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ok sounds like there is a lose connection in the airal or the speaker so it would probably need to be repaired

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1 Answer

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Its hard to tell exactly whats wrong without some more detail. I am assuming that these are 15 channel FRS walkie talkies? If they are than what you have is 2 FM 2 way radios that operate in the 450 mhz region. FM is usually really clear at both close and far distances. With AM radios its possible for the transimission to be distorted at close distances. First you want to check if this is a transmit problem (tx) or a recieve problem (rx). The easiest way to do this is to listen to other peoples transmissions and see if you can undertand them and if they are clear. Push the monitor button or whatever function there is on that particular radio to turn the squelch off. What you want is to hear static so you will be able to hear other people talking on other handhelds that are using different tones than you or might be too far to break squelch. You want to hear everything. Check how other people transmissions sound..... if they are hard to understand like a transmission from you other handheld does. If the other radios you pic up sound clearer....try using yours again.... but give it some distance... The speakers in these thing are not the best to begin with. Try that out and let me know your results... try to desribe what your hearing in detail.... like "garbled" "distorted" "low audio" stuff like that so I get an idea of what your hearing. Try it out

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