User's Manual

UB-81 BODYPACK MIC TRANSMITTER
8. UB-81 Transmitter Set Up
• Install by battery for the UB-81 transmitter by snap-opening the Battery door (15)
and inserting a fresh 9V alkaline or NiMH battery into the Battery compartment
(16), observing the correct polarity. Close the battery door to its original position
and completely cover the battery. Fresh alkaline batteries can last up to 10 hours
in use, but in order to ensure optimum performance, it is recommended that the
battery be replaced after 6-8 hours of use. A NiMH battery should be replaced with
another 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.
• Selecting Audio Input Operating Mode of the UB-81. The UB-81 is equipped with two
Input selector switches (17) located under the cover on the circuit board for selecting
the type of audio input you will be supplyin g to the transmitter. Select from the choice
of two positions: HEADWORN MIC and LAVALIER MIC (Condenser Microphones).
• There are two switches with selectable positions HM, LT together at same time.
To select inputs: (see chart on page 9)
A. Headworn Mic — set both switches to “HM”
B. Lavalier Mic — set both switches to “LT”
(Note: Use only the input audio source as per the input selected with the internal
Audio input selector switches (17) or the audio will not be optimal–a muddy or
distorted sound may result. Do not select the GT setting as the U-81 receiver outputs
are not suitable for wireless instrument use.)
• Connection for the selected input to the UB-81 is provided with a 3.5 mm Locking jack
(18) for connecting the audio input selected. Connect either the Instrument cord (19)
or the Headworn mic (20) or Lavalier mic cord (21) as desired, according to the input
selected. To secure the connection, turn the slip ring on the plug clock wise to thread
it on the jack. To unplug, reverse the process. Slip the transmitter into a pocket or
Clip (22) it on to your clothes or instrument strap (if using the UB-81 as an instrument
transmitter).
• Turn on the UB-81 by sliding the ON/STDBY/OFF switch (23) to the STANDBY
position (transmitter on, audio muted) or the ON position (transmitter and audio both
on). The Battery indicator LED (24) will give a single quick ash, indicating usable
battery strength. In the case of a dead or low battery, the LED either will not go on at all
or will stay on continuously, indicating that the battery should be replaced with a fresh
one. To conserve battery life, turn unit off when not in use.
• The U-81 transmitter 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.
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CAUTIONS AND TROUBLESHOOTING
10. No Audio
If you are not getting audio through the U-81 OCTAVO system, slide the transmitter
POWER or MUTE (STDBY) switch to ON, carefully check all connection and system
setup. Check or replace transmitter battery. Check that the receiver is powered.
The receiver and transmitter must be set to operate on the same RF channel.
11. Audio Distorted or Unwanted Sound
Remove or turn off nearby RF sources (such as other wireless system, CB radio,
CD player, computer, digital effect, ect...) Check or replace transmitter battery.
12. Feedback
Observe care in selecting P.A. volume, transmitter location and speaker placement so
that the acoustic feedback (howling and screeching) will be avoided. Please also note
the pickup pattern characteristics of the microphone selected. Omnidirectional mics
pick up sound equally from all direction, and are prone to feedback if not used carefully.
Unidirectional mics are more resistant to feedback. However, pick up sound source
best that are directly in front of the mic. In addition, mics that are farther from the sound
source, such as lavalier, required more acoustic gain and thus are also more prone to
feed back than close-source mics such as handheld or headworn models that are used
close to the mouth.
13. RF Interference
If you encounter receiving interference (from other than an operating TV station),
often it can be checked by turning off each transmitter at a time to nd the source of
causing interferences. Please note that wireless frequencies are shared with other radio
services. According to FCC regulations, wireless microphone operations are unprotected
from interference from other licensed operations in the band. If any interference is
received by any Government or non-government operation, the wireless microphone
must be cease operation or change frequencies. The above statement is valid only for
use in the U.S.A.
14. Signal Loss
Reposition the receiver and perform walk-thought test. If audio dropouts persist, locate
“dead” spots and avoid them during performance. Check receiver MUTE level setting.
Check or replace transmitter battery.
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