User's Manual

7. UH-81 Transmitter Set Up

• Release the Battery cover (11) by pressing the locking tab and slide down as

per arrow, exposing the Battery holder (12). Insert two fresh AA alkaline or NiMH

batteries, observing the correct polarity as marked, and slide the battery cover back

on to the microphone. Make sure the cover is closed completely. Fresh alkaline

batteries can last up to 10 hours in use, but in order to ensure optimum performance,

it is recommended that you replace the battery after every 6-8 hours of use. NiMH

batteries should be replaced with fresh ones recharged fully (with separate charger, not

supplied, and as per its charging instructions) whenever low or dead battery status is

indicated as per the following.

• Turn on the UH-81 by sliding the ON/STDBY/OFF switch (13) to the STANDBY

position rst (transmitter on, audio muted) or the ON position (transmitter and audio

both on). The Battery indicator LED (14) will give a single quick ash, indicating

usable battery strength. In the case of dead or low batteries, the LED will either not

go on at all or will stay on continuously, indicating that the batteries should be replaced

with fresh ones. To preserve battery life, turn the transmitter off when not in use.

• The microphone is now ready to use. The RF Signal LED (7) on the corresponding

channel of the U-81 OCTAVO receiver should now be lit, indicating a received signal

from the same frequency transmitter. When ready to speak, slide the ON/STDBY/OFF

switch (13) to the ON position.

• Adjust the volume of the receiver as per the Connecting Audio Outputs, section 6 of

the U-81 OCTAVO receiver instructions above.

Note: Observe care in selecting P.A. volume, transmitter location and speaker placement so that acoustic

feedback (howling and screeching) will be avoided. Please also note the pickup pattern characteristics of

the microphone selected. Omni-directional mics pick up sound equally from all directions, and are prone

to feedback if not used carefully. Unidirectional mics, as provided with the UH-81, are more resistant to

feedback, but pick up sound sources best that are directly in front of the mic. Also, mics that are farther

from the sound source, such as lavaliers, require more acoustic gain and thus are also more prone to

feedback than close-source mics such as handheld or headworn models that are used close to the mouth.

UH-81 HANDHELD MIC TRANSMITTER

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