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One possibility is the other radios in your group are operating open squelch (aka without a tone code, private line, PL, interference eliminator). If your radio has a CODE turned on, your radio will block receiving radios without the same exact code.
This is a sign of a bad or low battery. Try swapping batteries with a known good unit to see if the problem is solved. It takes more energy to transmit than to receive, so as you described a radio can receive messages, but then when you go to transmit and use more energy the battery will not have enough power to do so.
Three things come to mind:
1) The radio is receiving, hence the light, but you may have a different PL code than the other radio and it is muting the transmission. Check your programming to be certain both radios are programmed alike. The red light indicates activity on your frequency.
2) Your radio may have a problem with the receive side of the radio or a bad speaker.
3) The transmitting radio may have a problem with transmit. This can be a sign of a bad battery. Swap batteries and see if the problem moves to the other radio. If so, replace the battery. (It takes more energy to transmit than to receive, so loss of transmit is common with a bad battery.)
It is possibly a bad or very low battery. It takes more energy to transmit than to receive. So typically when you have a failing battery you will experience no transmit, but receive is okay. Constant, or low grade static is also a sign of a bad battery. Simple test to see if it is the battery, swap the batteries between the two radios and see if the problem moves to the other radio.
I would guess you have a PL set on the receive side, and not on the Transmit side. So the audio is being blocked by the PL (as it is supposed to be!) Check your programming, make sure you have the same PL on tx and rx.
You either have a programming issue, bad/low battery, or your radio may be in need of repair. It takes more energy to transmit than to receive, so the first to go is transmitting when you have a bad/low battery. Secondly, this type of issue can be caused be a bad internal PTT, which is a common failure part on this radio.
Technically no. The reason is the receiver end would be overloaded with the signal from whichever is transmitting specially if on the same frequency. This could only be done if the frequencies of the two radios are largely apart and a duplexer/cavity filter is used. An alternative is to have a small local repeater, a single common antenna for both receive and transmit and a row of cavity filters. A low power portable anywhere in the vessel would be electronically repeated by the repeater to be received by any low power portable again anywhere in the vessel.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
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.