T5100 : One radio receive but not transmit back.

Strange. Could it be any of the radios are from different countries? The channels are not worldwide. For instance, Canadian radios are on different frequencies than USA radios. They look identical.

sounds like the PA has failed, I would have the radio shop serviced

It is possible your Code for transmit is different than your Code for receive. Cobra makes so many models, you are not giving enough information. Also, Transmit takes a LOT of power, so even if everything is setup, if your batts are weak or old, the radio will receive, but not transmit. Also check your antenna, make sure it is tight and NEVER transmit without an antenna. Yes, all lights will work even with old batteries.

The squelch control is too far open and results in it thinking the channel is busy.

A few items to check:
Be certain both radios are set to the same:
Frequency
Interference Eliminator Code
Qt filter

For a simple test set the Code, Qt filter, and any other special features to off or zero. This will allow you to find out if the radios will work simply on their frequency. Once you establish this, you can add in the features as you need them.

Here is a link to the T4900 & T5100 user guides (couldn't find T5000 alone.):
http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T4800_UserGuide.pdf

http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T5XXx_User_Manual_E.pdf

Best regards.

check batteries, maybe they are on the way out. otherwise its in the lever connection. old?

Hello,
You want to be able to transmit to the Coast Station on this frequency I assume. The Coast Guard monitors channel 16 at all times. This would be the primary channel in the United States. Your radio is VHF Marine Radio and has a built in frequency range of 156.050 MHz to 163.275 MHz. There is no need for a modification. This is a duplex frequency. What that means is you will transmit on one frequency and receive on another, while on channel 20. You will not need to transmit on 161.600. Turn your radio to channel 20. When you transmit, you will transmit on 157.000. And when the Port responds to you your radio will automatically receive their signal on 161.600. So if you are trying to figure out how to communicate with the port authorities then for that frequency turn your radio to channel 20 and you will be able to communicate with them.

Regards, Tony

Sounds like the PLL circuit....... no channel synthesizer will kill the transmit and receive...... bad crystal or IC could be at fault or if someone has attempted to add more channels could also be cause.

Hello jf1111,

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.

Best Regards,
Ken
"Go Ahead. Use Us."

Hi,

It is possible that your Motorola FR60 though on the same channel/frequency have different CTCSS settings. CTSS is also known as Interference Eliminator Code or Coded squelch, Private-Line, PL, Quiet Call, Channel, Guard, etc. What needs to be done is to set both to the same code setting on the settings/menu. Turning the code/CTCSS OFF would also serve the same but allow other radios (without CTCSS) to be likewise received/heard.

If they are already on the same code setting and still no receive audio, it is possible a fault on the squelch, receive/audio circuitry or even the speaker itself which of course would require hands-on/in-shop service.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.