Nady Systems 9E3HT-U81 Manual Do Utilizador

• Release the 

Battery cover (11) by pressing the locking tab and slide down as 

per arrow, exposing the 

Battery holder (12). Insert two fresh AA alkaline or NiMH 

batteries, observing the correct polarity as marked, and slide the battery cover back 

on to the microphone. Make sure the cover is closed completely. Fresh alkaline 

batteries can last up to 10 hours in use, but in order to ensure optimum performance, 

it is recommended that you replace the battery after every 6-8 hours of use. NiMH 

batteries should be replaced with fresh ones 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.

• Turn on the UH-81 by sliding the 

ON/STDBY/OFF switch (13) to the STANDBY 

position first (transmitter on, audio muted) or the ON position (transmitter and audio 

both on). The 

Battery indicator LED (14) will give a single quick flash, indicating 

usable battery strength. In the case of  dead or low batteries, the LED will either not 

go on at all or will stay on continuously, indicating that the batteries should be replaced 

with fresh ones. To preserve battery life, turn the transmitter off when not in use.

• The microphone is now ready to use. The 

RF Signal LED (7) on the corresponding 

channel of the U-81 OCTAVO receiver should now be lit, indicating a received signal 

from the same frequency transmitter. When ready to speak, slide the 

switch (13) to the ON position. 

• Adjust the volume of the receiver as per the Connecting Audio Outputs, section 6 of 

the U-81 OCTAVO receiver instructions above.  

• If the Volume Control of the receiver is set too high, it may overdrive the input of the 

mixer, causing distortion. Conversely, if the output is set too low, the overall signal-

to-noise ratio of the system may be reduced. Adjust the output level of the receiver 

such that the highest sound pressure level going into the microphone causes no input 

overload in the mixer, and yet permist the mixer level control to operate in the normal 

range (not too high and not too low). This provides the optimum signal-to-noise for the 

entire system.

• Do not place the receiver antennas within 3 feet (1 meter) of another receiver or antennas.
• The receiver antennas should be kept away from any metal surface.
• For the best operation, the receiver should be placed at least 3 feet above the ground 

and 3 feet away from a wall or metal surfaces. All operating transmitters should be 

also at least 3 feet from the U-81 OCTAVO receiver. Keep antennas away from noise 

source such as motors, automobiles, neon light, signal processor, computer, as well as 

large metal objects.

• A single receiver cannot receive signal from two or more transmitters on the same 

frequency simultaneously.

• For operation with an external antenna, low loss RF shielded cable should be used and 

the length of the cable should not exceed 10 feet (3 meters).

• Position the receiver such that it has the least possible obstructions between it and the 

transmitter. Line of sight is best!

• The transmitter and the receiver should be as close as possible but never less than 

1 meter. 

• Before inserting the batteries, please make sure that they are inserted according to the 

correct polarity.

• Use only brand new alkaline batteries. Do not use “general purpose” batteries. When 

batteries are weak, replace the batteries altogether at the same time. Do not mix and 

use new and old batteries together.

• Turn the transmitter off when it is not in use. Remove the batteries if it is not to be used 

for a long period.

• Headset and lavalier mic users, note that the microphone element can easily be 

destroyed by the buildup of salts and minerals from perspiration and saliva. It is good 

practice to put a windscreen on the mic at all times to protect it.