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7. UH-81 Transmitter Set Up
• Release the Battery cover (11) by pressing the locking tab and slide down as per ar-
row, 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 mi-
crophone. 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 posi-
tion first (transmitter on, audio muted) or the ON position (transmitter and audio both
on). The
Battery indicator LED (14) will give a single quick flash, 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 place-
ment 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
11
12
13
14
UB-81 BODYPACK MIC TRANSMITTER
15
16
17
18
19 20 21
22
23
24
25
Instrument
GT HM LT
GT HM LT
GT HM LT
Headworn
Lavalier
INPUT SELECTOR
SWITCHES