Shure U4D Service Manual page 35

U4D Receiver 2 Alignment
25D1062 (AG)
Shure U4D Dual Diversity UHF Receiver
The Receiver 2 alignment procedure is identical to the Receiver 1
alignment procedure.
However, for the Receiver 2 alignment procedure refer to Antenna B
alignment procedures each time Antenna A is called out and refer to
Antenna A procedures each time Antenna B is called out.
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Service Procedures