User's Manual

UB-81 BODYPACK MIC 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

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 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

unplug, 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.)

UB-81 BODYPACK MIC TRANSMITTER

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