Nady Systems OCTAVO U-81 - Manual (Page 5)

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U-81 OCTAVO RECEIVER OPERATING INSTRUCTIONS
1. Rack-Mounting The Receiver
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.
(Note: Do not mount the receiver in a rack directly above an amplifier or other source
of high heat. This could degrade the performance of the U-81 OCTAVO. Always ensure
adequate airflow and heat dissipation in any rack configuration.)
2. Installing Antennas
Install antennas by connecting the two antennas included with your system to the two
RF TNC connectors (2) located on the left and right backside of the U-81 OCTAVO
receiver. The optimal positions of the antennas are 45 degrees from the receiver and 90
degree from each other. For maximum range, it is always best to maintain a line of sight
(no obstruction) between the receiver antennas ant the transmitters at all time whenever
possible.
3. Powering The Receiver
Powering the receiver by plugging the provided 15VDC/1000mA adaptor into the DC IN-
PUT jack (3) on the back of the receiver; then plug the adapter into an AC outlet. (Note:
Any 15VDC source with 1000mA 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, Power LED 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.
4. Mute (Squelch) & RF LED Display
The U-81 OCTAVO has a preset mute (Squelch) internally for each channel for maxi-
mum 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.
5. AF LED Display
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 dur-
ing audio signal input to the transmitter.
6. Connecting Audio Outputs
(Using the UH-81 handheld or UB-81 bodypack transmitters)
• For microphone use, the Balanced XLR out (9) or the 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, with an output loading of 600 ohms to accommodate both balanced
and unbalanced mics. 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.
TIPS
• If the Volume Control of the receiver is set too high, it may over-driver 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 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 1 meter above the
ground and 1 meter away from a wall or metal surfaces. All operating transmitters
should be also at least 1 meter from the U-81 OCTAVO receiver. Keep antennas away
from noise source such as motors, automobiles, neon light, signal processor, comput-
er, 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 3m.
• 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.
Note: Scratchy noises can sometime occurs when some electric guitars with dirty pots
or connections are used with any wireless system. Therefore, the supplied capacitor
provides first order filtering of the RF signal from the cord into the guitar and eliminates
virtually all scratchy noises. Should your equipment still give you scratchy noises, we
suggest these steps to eliminate them:
• Make sure all guitar volume and tone pots are clean and all contacts are solid-this is
very important.
• A 47pF capacitor soldered across the pot to ground terminal of the guitar’s volume
and tone pots will provide extra filtering.