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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Re: Poor Transmission (Garbled)
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
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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.
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.
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.
1) Bad or poorly charged battery. (try a known good battery and see if the problem clears up)
2) Poor connection to the battery. (clean all contacts with a pencil eraser)
3) Bad PTT internal button, radio would need repair.
4) Bad antenna. Check for breaks in the rubber covering.
5) Other internal problems requiring repair.
Well from my research, this unit outputs about 2 Watts. Now that's NOT a lot of transmission power, really. However I would still expect it to go more than 1/2 mile. The most important thing with any 2 way radio, is the Antenna. it needs to be mounted clear of anything at BOTH ends. Having ensured that the Power Must be 100% a bad battery will equal low output and poor sensitivity. Now if that's all OK, then the only other thing it can be is interference this can cause a lose of signal, as signals heterodyne with each other. As well check ALL wirings and connections for good contacts.Also if possible, test another unit out and see just what range you should expect?
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......
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