Troubleshooting - Shure UHF-R MW User Manual

Shure UHF-R MW Wireless
®

Troubleshooting

No sound
Faint Sound or Distortion
Lack of range, unwanted noise bursts, or drop outs
Cannot turn transmitter off or change frequency settings, or can't program receiver
Excessive hum or buzzing
Power
Make sure that the transmitter and receiver are receiving sufficient
voltage. The receiver requires at least 90 Vac. Check the battery
indicator on the transmitter and replace battery if necessary.
Gain
Adjust the transmitter gain and sensitivity settings (see page 14) or
the receiver output level (page 9), or toggle the mic/line switch
on the back of the receiver.
Cables
Check that all cables and connectors are in working order.
Ground Lift
Lifting the ground on pin 1 of the XLR output on the receiver can
sometimes remove hum or buzz in the audio signal. Set the GND/
LIFT switch on the receiver to LIFT if you are using the XLR
connector.
Interface Locks
Both the transmitter and receiver can be locked to prevent accidental
changes. On transmitters, look for a lock symbol on the LCD and
use the key combinations illustrated on page 14 to turn it off.
To turn off the receiver interface lock, see page 9.
Increasing Range
If the transmitter is more than 6 to 60 m (20 to 200 ft) from the
receiver antenna, you may be able to increase range by doing
one of the following:
Reduce interference (see above)
•
Increase transmitter RF power level (see page 14).
•
Use an active directional antenna, antenna distribution
•
system, or other antenna accessory to increase RF range
(see page 18).
Issue
Power, Cables, or RF
Gain
RF
Interface Locks
Ground lift
Radio Frequency (RF)
Using the RF LEDs
If neither blue RF LED is illuminated, then the receiver is not
detecting the presence of a transmitter.
The amber RF LEDs indicate the amount of signal being received.
This signal could be from the transmitter, or it could be from
an interfering source, such as a television broadcast. Turn the
transmitter off. If more than one or two of the amber RF LEDs are
still illuminated, then that channel has too much interference, and
you should try a different channel.
The red RF LED indicates RF overload. This will usually not
cause a problem unless you are using more than one system at
the same time, in which case, it can cause interference between
systems.
Eliminating RF Overload
If you see the red RF LED on a receiver, reduce the transmitter
RF power level (see page 14) or move the transmitter further
away from the receiver—at least 6 m (20 ft). If you are using
active antennas, reduce antenna or amplifier gain.
Compatibility
Perform a transmitter sync, or make sure the transmitter
•
and receiver are set to the same group and channel.
Look at the label on the transmitter and receiver to make
•
sure they are in the same band (H4, J5, L3, etc...).
Reducing Interference
Use a different channel or perform an automatic group or
•
channel scan (see page 11).
For multiple systems, check that all systems are set to
•
channels in the same group (systems in different bands
do not need to be set to the same group).
Maintain a line of sight between transmitter and receiver
•
antennas
Move receiver antennas away from metal objects or
•
other sources of RF interference (such as CD players,
computers, digital effects, network switches, network
cables and Personal Stereo Monitor (PSM) wireless
systems).
Eliminate RF overload.
•
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