Sony WRT-810A Operating Instructions Manual page 15

Select the channel to be used.
(Use the procedure in "Changing the Channel Selection" on
pages 10 and 11.)
2 Connect the lavalier microphone. (For WRT-820A only)
Microphone
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3 Set the POWER switch to ON.
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4 Set the AF switch to ON. (For WRT-810A only)
WRT-810A
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To prevent noise generation, keep the microphones and transmitters
at least 3 m (10 feet) away from the antennas when the system is °
operated using a group which allows selection of up to 11 channels,
and at least 6 m (20 feet) away when using a group which allows
selection of 12 to 19 channels.
Ensure that the tuners set to channels not being used are either
turned off or set to the minimum output level (the LEVEL adusiment
knob set to MIN).
Turing the microphoneAransmitter on or off may generate some
noise. To minimize the impact of such noise, set the LEVEL
adjustment knob of the tuner being used to MIN beforehand.
Switching the unit on without checking the channel selection first may
interfere with the operation of other microphones/transmitiers, if the
current setting is already being used.
The WRT-820A unit may be put in the soft case upside down so that
its wire antenna points downward.
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