Shure UHF-R User Manual download pdf (Page 15)

Shure UHF-R Wireless

Troubleshooting

Issue See Solution...

No sound

Power, Cables, or RF

Faint Sound or Distortion

Gain

Lack of range, unwanted noise bursts, or drop outs

Cannot turn transmitter off or change frequency settings, or can’t program receiver

Interface Locks

Excessive hum or buzzing

Ground lift

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 19).

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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Shure UHF-R User Manual Page 15

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