Nady Systems U-81 No Audio, Audio Distorted or Unwanted Sound, Feedback, RF Interference

U-81 OCTAVO RECEIVER OPERATING INSTRUCTIONS

•For each channel you wish to use, insert an audio cord with a XLR female plug into its Balanced XLR out (9) jack on the back of the receiver. Plug the other end of this cord into your amplifier, effects or mixing board. The front panel individual receiver Volume controls (6) can be adjusted for a suitable output level.

•The U-81 OCTAVO also has a MIX unbalanced output (10), which is a SUM line level output of all the channels. To use it, just plug an audio cable with a 1⁄4” mono plug into the MIX out (10) and plug the other end to your amplifier or mixing board. Turn the volume controls on each of the channels being used clockwise to near full gain. Adjust each volume up or down so that no audio distortion is present when the ampflier or mixer is set at their usual levels. (Note: Turn the volume controls of any unused chan- nel all the way off, full counter-clockwise, so that only the channels being used are in the MIX output.)

•Your U-81 OCTAVO is now operational and ready to use. Now that you have completed the above step, proceed to instructions for the UH-81 or UB-81 transmitters included with your system.

Note:

•To prevent possible undesired noise during use, keep the volume controls of unused channels (corresponding transmitter off) turned off in the amplifier or the mixer. The audio should only be “live” if the transmitter is on.

•As when making any connection, make sure the amplifier or mixing board volume is at the minimum level before plugging in the receiver to avoid possible sound system damage.

•Only one transmitter can be used with one receiver. It is not possible to use two transmitters on the same frequency and mix the output of these transmitters into one wireless receiver.

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CAUTIONS AND TROUBLESHOOTING

16. 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.

17. 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.

18. 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.

19. 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 find the source of causing interferences. Please note that wireless frequencies are shared with other radio servic- es. 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.

20. 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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