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Built a nice little adapter cable for connecting the Baofengs to a smart phone:
github.com/johnboiles/BaofengU
Really cheap (<2€), works great.

@marble high-pass filtering and it also presents a resistance to the cell phone, so it knows to use the "microphone" from the TRRS jack, instead of the internal one.

High-pass filtering is necces. because the baofeng likes to kick out crazy big DC voltage spikes whenever the squelch activates.

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