Nady Systems 9E3HT-U81 User Manual

The U-81 OCTAVO receiver has pre-drilled holes for rackmounting. Simply attach the 

Rack Mount Ears (1) on each side and fasten with supplied screws.

If not rackmounting the receiver, the two 

Antennas (2a) can be mounted directly on 

the 

Receiver Antenna Input Jacks (2b) on the receiver’s back panel. If rackmounting, 

antennas can be front mounted on the 

Rack Ear Jacks (2d), after installing the jacks 

on the 

Rack Ears (1) provided. Use the Antenna Connecting Cables (2c) to feed the 

received signal to the receiver’s antenna jacks as pictured, connecting them from the backs 

of the rack ear jacks to the receiver antenna jacks. The optimal positions of the antennas 

are 45° from the receiver, so 90° from each other.

Powering the receiver by plugging the provided 15VDC/1000mA adaptor into the 

DC INPUT jack (3) on the back of the receiver; then plug the adapter into an AC outlet. 

(Note: Any 15VDC source with 1200mA capacity can also be used.) Turn volume 

controls of all channels counterclockwise for minimum setting. Once the receiver is 

connected to a power source, press the power switch to the ON position, 

indicator (4) is ON. The TX LEDs indicator (7) and AF LEDs indicator (8) on the front 

panel of the receivers will not light up at this time, but only until one or more of the eight 

channels is receiving a signal from your system’s transmitters. To turn OFF, press the 

Power Switch (5) to the OFF position. 

The U-81 OCTAVO has a preset mute (Squelch) internally for each channel for 

maximum range and performance. There is no need to adjust this. In normal condition, 

the 

RF LEDs indicator (7) should be lit when a correct frequency is received from a 

transmitter. However, when the 

RF LEDs indicator (7) is extinguished, the transmitter 

is out of range for that given location, and the user should move closer to the receiver 

to re-establish the radio link. 

The U-81 OCTAVO receiver is equipped with an 

AF LEDs indicator (8). The AF LED 

indicator lights whenever an audio signal is being received from a modulated transmitter 

signal. The AF LED indicator is not a peak level indicator so it can light continuously 

during audio signal input to the transmitter.

• For microphone use, the fixed 

Balanced XLR out (9) or the adjustable 1⁄4” MIX 

out (10) can be used. The U-81 OCTAVO audio output stage of each channel is 

configured for XLR balanced microphone level when loaded by a 600 ohm balanced or 

unbalanced mixer input. Make sure the Phantom Power on your mixing board in turned 

off and the volume in turn down when making the audio connections. Start the receiver 

VOLUME at minimum and adjust until the level is optimal.

944-952MHz 

 

 

 This device complies with Part 15 of the FCC Rules. Operation

 is subject to the following two conditions: (1) this device may

not cause harmful interference, and (2) this device must accept

any interference received, including interference that may cause 

undesired operation. 

 

 changes or modifications not expressly approved by the party responsible for

 compliance

could void the user's authority to operate the equipment.

 

 

 

 

 

 NOTE: This equipment has been tested and found to comply with the limits for a

 Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are

 designed to provide reasonable protection against harmful interference in a

residential installation. This equipment generates, uses and can radiate radio

 frequency energy and, if not installed and used in accordance with the

instructions, may cause harmful interference to radio communications. However,

there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception,

which can be determined by turning the equipment off and on, the user is

encouraged to try to correct the interference by one or more of the following

measures:

-- Reorient or relocate the receiving antenna.

-- Increase the separation between the equipment and receiver.

-- Connect the equipment into an outlet on a circuit different

from that to which the receiver is connected.

-- Consult the dealer or an experienced radio/TV technician for help.