Nady Systems OCTAVO U-81 - Manual (Page 8)

9 8
UB-81 BODYPACK MIC TRANSMITTER
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 direc-
tions, and are prone to feedback if not used carefully. Unidirectional mics 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].
9. Microphone Use (with either a lavalier or headworn mic)
• Secure the connection from the Lavalier (21) or Headworn mic cord (20) by turning
the slip ring on the plug into the transmitter clockwise to thread it on to the jack. To un-
plug, reverse the process. To use the lavalier mic, attach it at chest level. Do not place
it too close to the mouth–a distance of about six inches usually works best. To use the
headworn mic, place it on the head and adjust the boom so that the mic is about one
inch to the side of the front of the mouth. When ready to speak, slide the ON/STDBY/
OFF switch (23) to either the “STDBY or ON” position.
• For optimum performance, an Input level control (25) is provided. Adjust the gain by
turning the control with a small screwdriver. For lavalier mic use, it is recommended
that the level be set at about 1/2 maximum. For headworn mic use, it may be advisable
to turn the gain down somewhat, depending on the volume levels expected. In either
application, experiment and set for maximum possible gain without audible distortion
on the high level peaks.
(Note: Turning down the gain too much can compromise the signal-to-noise and it is not
recommended.)
10. Instrument Use (Optional)
Secure the connection from the GT cable (19) by turning the slip ring on the plug into
the transmitter clockwise to thread it on the jack. To unplug, reverse the process. Plug
the 1/4” phone plug into the instrument. When ready to play, slide the audio ON/STDBY/
OFF switch (23) to either the “STDBY or ON” position Adjust the volume of the receiver
as per the Connecting Audio Outputs, section 6 of the U-81 OCTAVO receiver instruc-
tions above.
[Note: The Input level control (25) is deactivated and not used when the UB-81 is in
Instrument (GT) mode. Levels should be adjusted with the volume control of your instru-
ment.]
[Note: Scratchy noises can sometimes occur when some electric guitars with dirty pots
or connections are used with any wireless system. Therefore, the supplied Instrument
cord (19) has a factory-installed capacitor inside the 1/4” plug. This capacitor provides
first order filtering of the RF signal from the cord into the guitar and eliminates virtually all
scratchy noises. Should your equipment still give you scratchy noises, we suggest these
steps to eliminate them:
• Make sure all guitar volume and tone pots are clean and all contacts are solid–this is
very important.
• A 47pf capacitor soldered across the hot to ground terminals of the guitar’s volume
and tone pots will provide extra filtering.]
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), ob-
serving the correct polarity. Close the battery door to its original position and complete-
ly 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 three positions: INSTRUMENT (for guitar, bass, etc.), HEADWORN MIC, and LAVA-
LIER MIC (Condenser Microphones).
• There are two switches with selectable positions GT, HM, LT together at same time.
To select inputs: (see chart on page 9)
A. Instrument — set both switches to “GT”
B. Headworn Mic — set both switches to “HM”
C. 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.)
• 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 posi-
tion (transmitter on, audio muted) or the ON position (transmitter and audio both on).
The Battery indicator LED (24) will give a single quick flash, 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 correspond-
ing channel of the U-81 OCTAVO receiver should now be lit, indicating a received
signal from the same frequency transmitter.
• 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