English
5
RECEIVER VOLUME ADJUSTMENT
The volume control on the front panel of the AXU4 receiver can
be adjusted to make the wireless system output level identical to
that of a cabled guitar or bass or wired microphone. After making
any necessary transmitter gain adjustments, adjust the receiver
volume control until the output reaches the desired level. Rotate
the volume control clockwise to
increase output. Rotate it coun-
terclockwise to
decrease output.
RECEIVER SQUELCH ADJUSTMENT
The squelch control on the AXU4 receivers is factory preset
for optimum performance. No further adjustment is normal-
ly required. It is possible to adjust the squelch control setting to
emphasize either signal quality or system range:
•
Turning the squelch control clockwise causes the receiver
to demand a higher quality signal (less noise before mut-
ing), but decreases operating range.
•
Turning the squelch control counterclockwise allows a low-
er quality signal through (more noise before muting), but in-
creases
operating range.
To return the receiver squelch control to the factory setting, ro-
tate it to the mid-range position (so the slot is vertical).
ABOUT THE SHURE NOISE SQUELCH SYSTEM
Conventional squelch circuits analyze RF signal strength; they
cannot distinguish between noise and desired signals. Conse-
quently, when a conventional wireless system is used in a noisy RF
environment, its circuits may “open” unexpectedly, sending loud
bursts of noise through the receiver when the transmitted signal is
weak or turned off.
Unlike conventional wireless systems, Shure Access systems use
a noise squelch circuit that analyzes
signal quality instead of signal
strength. A special detector monitors the level of high frequency
noise. When the transmitter signal is strong, the system’s noise lev-
el is low and the receiver sends audio through. When the transmit-
ter signal is weak or absent, the system’s noise level is high and the
squelch circuit will mute the receiver. This virtually eliminates the
possibility of annoying bursts of noise coming through the receiver.
TIPS FOR ACHIEVING MAXIMUM PERFORMANCE
•
Make sure you can always see a receiver antenna from the
transmitter position.
•
Keep the distance from transmitter to receiver antenna as
short as possible.
•
Point receiver antennas away from each other at 45
°
from
vertical.
•
Avoid placing the receiver antennas near metal surfaces and
obstructions.
•
Monitor battery fuel gauge and replace battery as soon as red
light is on.
•
Let the body-pack transmitter antenna hang freely; do not coil
or keep in pocket.
•
If stacking or rack mounting receivers in a multiple-system
use situation, do not allow antennas to touch or cross.
•
Perform a walk-through before performance or presentation.
If dead spots are found, adjust location of receiver. If dead
spots remain, mark spots and avoid.
