Published On Jan 20, 2018
This is a professional wireless system by Shure with rack-mount ULXP4 receiver and ULX1 body-pack transmitter. The receiver did not show an active channel and battery status of the transmitter. A look at the RF spectrum showed that the so-called "tone key" signal was not transmitted. The problem was traced to a cracked soldering joint on one of the pins of a board-to-board connector.
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