Nady U-800 Manual - Page 17

7. CAUTIONS AND TROUBLESHOOTING Feedback Avoid acoustic feedback (howling or screeching) by taking care in selecting PA volume, transmitter location and speaker placement. Please also note the pickup pattern characteristics of the microphone selected. Unidirectional microphones are more resistant to feedback. However, they pick up sound sources best that are directly in front of the microphone. Also, mics that are farther from the sound source (such as a handheld) require more acoustic gain and thus are also more prone to feedback than close-source mics. No or Low Audio If you are not getting audio through the system, carefully re-check all setups. Especially note that the receiver and transmitter must be set to operate on the same RF channel. Also confirm that the transmitter's AUDIO MUTE (36, 40) is not in the OFF position. The receiver's UNBALANCED LINE OUT (19) is adjustable so make sure the VOLUME CONTROL (21) is set properly. RF Interference and Finding Open Channels The FCC mandates the following information be provided to all end users of this equipment: Consumer Alert Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50mW); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC) or visit www.fcc.gov/cgb/consumerfacts/wirelessmic_factsheet.html. If you encounter slight receiving interference when the transmitter is far from the receiver (from other than an operating TV station on the same frequency), it can often be overcome by adjusting the receiver's MUTE LEVEL/SQUELCH (13)-see Adjusting the Mute Level / RFSquelch. If receiving interference on a selected channel with the transmitter off, or if you encounter interferences in operating multiple U-800 systems simultaneously at the same location see: "6. Selecting Group/Channel, IR Programming and Simultaneous Multichannel Operation" for proper procedures for reprogramming system(s) for open channels. 17