Rather than getting an impedance matched ptt, buy a 1.2k - 2k ohm electret mic and swap out your mic on your sordins. It's only 3 screws, pop off the dust cover, and unsolder the old mic and solder the new one on it. I put a drop of hot glue under the the one to keep it in place. Now you can use a cheap ptt from eBay (or nice one) and everyone will be able to hear you nicely while using non military radios. Ie: pretty much anything.
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