Nady Systems U-800 User Manual

17

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.

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.  

The FCC mandates the following information be provided to all end users of this 

equipment:

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 en-

counter interferences in operating multiple U-800 systems simultaneously at the same 

location see: “6. Selecting Group/Channel, IR Programming and Simul-

taneous Multichannel Operation” for proper procedures for reprogramming 

system(s) for open channels.

7. CAUTIONS AND TROUBLESHOOTING