IMHO, AT&T cell phones are the worst. In our studio I now recognize the odd chattering sound they make. When I first heard it some years ago I thought it was a hardware issue. But an associate clued me in that it was probably caused by a cell phone. After that every time I heard that sound, I checked if the talent had their cell turn on and every time they had. On a set or in the recording studio you can ask (demand) everyone turn off their phones. However, with a public audience there’s little you can do but hope you don’t get hits. In a situation like yours you might put a Zoom with mic on the podium and record independent of the sound company. Take their feed, but the Zoom might be a backup. Often, it’s a combination of cable, grounding, console, recorder that picks up the interference. Perhaps a simpler setup would be less susceptible.
John
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