Firmware Mismatch; Radio Frequency (Rf) - Shure ULX-D Quad Manual

Firmware Mismatch

Paired transmitters and receivers must have the same firmware version installed to ensure consistent operation. See Firmware
topic for firmware update procedure.

Radio Frequency (RF)

RF LEDs
If neither blue RF Diversity LED is illuminated, then the receiver is not detecting the presence of a transmitter.
The amber RF Signal Strength LEDs indicate the amount of RF power being received. This signal could be from the transmit­
ter, or it could be from an interfering source, such as a television broadcast. If more than one or two of the amber RF
LEDs are still illuminated while the transmitter is off, then that channel has too much interference, and you should try a differ­
ent 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 in the other system.
Compatibility
• Perform a Scan and Sync to ensure 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 (G50, J50, L50, etc...).
Reducing Interference
• Perform a group or channel scan to find the best open frequency. Perform a sync to transfer the setting to the transmitter.
• 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 (see below).
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.
• Use Normal mode instead of High Density mode.
• Use an active directional antenna, antenna distribution system, or other antenna accessory to increase RF range.
Eliminating RF Overload
If you see the red RF LED on a receiver, try the following:
• Reduce the transmitter RF power level
• 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.
• Use omnidirectional antennas
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