One of the annoying things about working with really sensitive detectors is that they're extremely sensitive
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@ldcd it doesn't trigger on iphone loudspeakers?
@whitequark i mean it probably does tbh, but the permanent magnet in the back of the phone alone is enough to cause it to shift a couple dozen kHz when you move the iphone from 20ft away to like 6ft away
this one (behind several layers of metal mind you!) responds everytime someone with an iphone walks past because iphones have that magnetic charging ring thing