I can hear some radio chatter (receive) but cannot reply (transmit). It's like the PTT (push to talk) button isn't working or something. Same problem with rubber on-radio antenna as with it attached to my vehicle antenna. Any ideas?
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Check the headset jack. There may be something inside causing a short. also, the CLS has an audio tone out button. Be certain you are not pressing it as you push the PTT button. The PTT is odd on this radio, it is the top BIG rubber button on top FRONT. Many customers get this confused with the tone transmit button.
It is more likely a power issue. PTT switches do not normally cause a short circuit. Check the batteries, swap the batteries and see if that helps. Radios take a great deal more power to transmit than turn on or receive. If not the battery, try a low voltage battery, such as a cordless phone battery. If it still occurs, check your warrany and send it back to the factory.
The ACTUAL problem is your rechargeable batteries have most likely depleted over time, and since it takes more batterie power to transmit than to receive it can appear that your batteries are fully charged and you can be receiving but due to the batterie it will be unable to transmit
It takes a lot more power to transmit than it does to receive. So it is possible to listen but not be able to talk. Make sure that the batteries are charged and that the batteries are holding a charge. When batteries begin to fail they won't hold a charge for long at all.
You would need two or more radios to be able to communicate with others. Then you simply press the push-to-talk (PTT) button when you want to talk (transmit) and release it so others can reply (receive). The radios must be set to the same settings to be able to communicate.
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.