Sennheiser EK 100 - 01-09 Instruction Manual page 21

Synchronizing a transmitter with the diversity receiver
On one of the receivers, select a channel within this frequency bank and
assign this channel one of the calculated receiving frequencies (see
page 17).
Synchronize a transmitter with this receiver (see page 14).
OR:
Manually set the transmitter to the same frequency bank and channel
that you set on the receiver.
Repeat for the remaining transmitters and receivers as described
above.
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