I received a set of 2-way radios and upon charging them and using them, I got a lot of static from one of the units when I tried to talk into it. i also received the same problem when someone tried to talk to the radio. when i grabbed another radio (different type completely) i had, i was able to communicate fine with one of the 550's radios but the other gave static still. I'm thinking that there might be something wrong with the speakers in one of the units.
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It sounds like your monitor button is stuck and you are hearing the white noise. Try pressing the monitor button on your other radio and see if the noise is the same. If so, your button is stuck. If not...
Sometimes a lot of static can be an indication of a bad or poorly charged battery. To check for this trade batteries with your known good radio and see if it solves the problem.
It sounds like a damaged or dirty volume control. I have seen controls where the element inside the control snaps and this sounds like what has happened to your radio. You did not say if the squelch control was set open or closed. If what you are hearing is loud static, I would adjust the squelch control on the radio to see if it stops.
Most likely your CTCSS tone codes are not turned on on the Midland radios. The CTCSS codes are also known as "Privacy Codes" or similar. They will be from 1 to 38. Your Midland manual will tell how to set the codes on the radios. The Motorolas usually show the selected tone code below the channel number. Alternately, you may be able to turn off the tone code on the Motorola radio(s) by setting it to "0" or "off". Then you will not need codes turned on on any of your radios and they should all communicate fine.
This model radio does not have Privacy codes to filter your communications,you should change them for a model with this feature.
A radio with this feature you have to choose the channel first then the privacy code in both radios or in all radios that want to communicate with, if any radio that is in the same channel but with a diferent privacy code, will not be heard
If the antenna for the other properly operating radio is used with the radio with the noise and you are getting the static then we can assume it is the radio. If you hear signals with the static, that is, it does receive communications at the same time, there may be a problem with the noise reduction circuitry, or a defective component(s) in the receiver. Without knowing your experience I would suggest taking to a radio shop.
It could be a low battery. Does the screen go completely blank when you attempt to transmit? Two way radios draw a lot more power when transmitting then when receiving so a low battery might cause the radio to cut out when you press the Push-to-Talk and then the radios might appear to turn back on when you release the PTT. If this behavior persists even after charging the battery then the battery or charger (or both) might be defective.
If the battery isn't the issue then the radio could be programmed incorrectly. Does the problem occur on all channels or just one? The Kenwood ProTalk requires dealer programming with a software kit to set the frequencies for each channel. A channel that is programmed for an out of bounds frequencies would generate an error when the PTT is pressed. You might need to have the programming checked out by your local Kenwood Two-Way radio shop.