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
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.]
