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I would check the mic hole in the face of the PMR_2 to verify if there is anything covering it IE. tape stickers debris wax paint anything of the like. Also if the radios are digital, they may use a DPL code. If you have the computer program to set the frequencies and associated programming cables, connect them to a computer with that same program and verify the frequency output they need to be the same frequency. Also, they may use a DPL code ( channel encryption code that keeps channels private on a common frequency) if so they need to be the same. If they are analog then you check the frequency and the TPL code if it has one. All codes/ frequencies must match for communication to happen between the radios.
The problem is caused by the microphone preamp in the headset demodulating the AM transmission. Sordin MSA headsets also have the same problem. What you require is a headset with no electronics in it and a dynamic microphone.
A couple of things you can try: 1. Use electronic contact cleaner (spray type) on the PTT switch; 2. Use an external speaker/microphone and/or handsfree VOX headset 3. Replace the PTT switch. 4 solder points. Might not be easy but doable.
The last would require that you remove the defective PTT switch and use that as per sample when looking for replacement. Some printers uses the same type of switch. Familiarity with electronic components/circuitry, use of a DVM and a soldering iron would also be required.
Hope this be of some idea/help. Pls post back how things turned up or should you need additional information.