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by voltagex_ 4228 days ago
I didn't realise how common it was to multi-purpose these jacks until recently.

Nexus 4 and 5 have their UART via the headphone jack - you need a TRRS headphone cable with the correct resistor wired up to one of the pins.

Kenwood even came up with a standard for it: http://www.miklor.com/COM/UV_Technical.php#progcable

A popular series of VHF/UHF